It’s no exaggeration to say that without Greg Matloff, there would have been no Centauri Dreams. After reading his The Starflight Handbook (Wiley, 1989) and returning to it for years, I began working on my own volume in 2001. Research for that book would reveal Matloff’s numerous contributions in the journals, especially on solar sail technologies, where he illustrated early on the methods and materials needed for interstellar applications. A professor of physics at New York City College of Technology (CUNY) as well as Hayden Associate at the American Museum of Natural History, Dr. Matloff is the author of, among others, Deep Space Probes (Springer, 2005) and Solar Sails: A Novel Approach to Interplanetary Travel (with Les Johnson and Giovanni Vulpetti; Copernicus, 2008). His latest, Starlight, Starbright, is now available from Curtis Press, treating the controversial subject of today’s essay.

by Greg Matloff


Introduction: Motivations

As any web search will reveal, most of my research contributions have been in the fields of in-space propulsion, SETI, Earth-protection from asteroid impacts, planetary atmospheres, extra-solar planet detection and spacecraft navigation. Since I have consulted for NASA on solar-sail applications, I have trained myself to err on the side of conservatism. However, a true scientist cannot ignore observational data. He or she must base hypothesis and theories upon such results, not upon previous experience, ideology and dogma.

Image: Gregory Matloff (left) being inducted into the International Academy of Astronautics by JPL’s Ed Stone.

Until 2011, I never expected that I might contribute to the fascinating debate regarding the origin and nature of consciousness. On one side are the epiphenomenonalists, who believe that consciousness is a mere byproduct of bio-chemical activity in the complex brains of higher organisms. On the other side are the panpsychists, who believe that a universal field responsible for consciousness, sometimes referred to as “proto-consciousness,” reacts with matter to produce conscious activity at all levels. The philosophical arguments were fascinating, but to me as a scientist they were a bit disappointing. There seemed to be no way of elevating the argument from the realm of deductive philosophy to the realm of observational/experimental science.

But in 2011, as documented in my June 12, 2012 contribution to this blog – Star Consciousness: An Alternative to Dark Matter – I learned (much to my surprise) that it may be possible now to construct simple models of universal consciousness and test them against observational evidence.

I was primed for this work by several factors. First, an early mentor of mine and a coauthor of several astronautics papers, was the late Evan Harris Walker. With expertise in plasma and quantum physics, Harris (as his friends called him) was a pioneer in the infant field of quantum consciousness. Although I am far from an expert in quantum mechanics, I was fascinated by Harris’ attempt to explain consciousness by the quantum tunneling of wave functions through potential wells created by the inter-synaptic spacing in mammal brains [1].

After the success of The Starflight Handbook and other contributions to interstellar travel studies, I was asked by Apollo 11 astronaut Buzz Aldrin in the early 1990’s to join the team of scientific consultants for a science-fiction novel he was co-authoring with John Barnes [2]. For plot purposes, Buzz required the stable, long-term existence of a Jupiter-like planet at a 1 Astronomical Unit (AU) distance from a Sun-like star. When he asked me to check the possibility of such a planet, I was initially very pessimistic. When I told Buzz that most exoplanet experts believed that the Hydrogen-Helium atmosphere of such a planet would likely evaporate quickly (in cosmic terms), he asked me to check this assumption. I located an appropriate equation in a space science handbook and calculated the estimated lifetime of the giant planet’s atmosphere. I was surprised and Buzz was gratified to learn that the lifetime of the Jovian’s atmosphere at 1 AU would be billions of years. At that point in my career, I was an adjunct professor and consultant. Since I was unable to locate a derivation for the subject equation, I elected not to challenge scientific orthodoxy and attempt to publish these results in a scientific journal. After the discovery of “hot Jupiters” circling Sunlike stars a few years later, I became credited (by Paul Gilster and others) with predicting the existence of hot Jupiters in a science-fiction novel, but not in a peer-reviewed journal. I vowed to never repeat this mistake again and hold back data, if my results challenged established paradigms.

The third influence pointing me in the direction of conscious stars was an undergraduate, liberal arts student at New York City College of Technology. Between the time I became a tenure-track professor in 2003 and my retirement from full-time teaching in 2011, I organized and coordinated the astronomy program at New York City College of Technology (NYCCT). In the first term of the NYCCT astronomy sequence, students learn about astronomical history, aspects of classical and modern physics and solar-system astronomy. In the second term, they investigate the astrophysics of the Sun, stars, and galaxies, cosmology, and the prospects for extraterrestrial life. In one Astronomy 2 section, I was lecturing about dark matter. The existence of this mysterious substance has been invited to explain anomalous stellar motions. When a liberal arts undergraduate interrupted the lecture, I learned that he doubted dark matter’s existence. His supposition was that physics is at an analogous stage to the situation in 1900. A major shift in physical paradigms may be necessary to explain the many anomalies (including dark matter) building up in observational astrophysics.

In 2011, it all came together. Kelvin Long, who edits the Journal of the British Interplanetary Society (JBIS), invited me to participate in a one-day symposium at the London headquarters of the BIS to celebrate the work of Olaf Stapledon, a British science-fiction author and philosopher who has greatly influenced astronomical and astronautical thought. In his 1937 masterwork Star Maker, Stapledon predicted nuclear energy, nuclear war, interstellar travel, space habitats and rearrangement of solar systems by intelligent extraterrestrials. Because I usually author papers on these topics and have often cited Star Maker, I elected to avoid astrotechnology in my contribution to this BIS symposium and instead concentrate on a core aspect of Stapledon’s philosophy: that the stars and indeed the entire universe are in some sense conscious.

A Toy Model of Stellar Consciousness and Astrophysical Evidence

Many people have written about consciousness. Since there is no agreed upon definition of this quality, I decided to investigate a symptom of stellar consciousness. This is Stapleton’s supposition that a fraction of stellar motions around the centers of their galaxies is volitional. According to Stapledon, stars obey the canons of a cosmic dance as they travel through space. Many researchers consider the seat of consciousness in humans and other lifeforms to be neurons or tubules [1,3,4]. I have little knowledge regarding the intimate details of the stellar interior. But I am pretty sure that neurons and tubules do not exist within stars. However, most cooler stars, including the Sun, do have simple molecules in their upper layers.

Contrary to what many of us learned in high school chemistry, the Van der Waals forces that hold the atoms in molecules together are not purely electromagnetic. Some of this attraction is due to the so-called Casimir Effect [5]. Vacuum is not truly empty. Instead, in tiny intervals of space and time, there are enormous fluctuations of energy and matter. Generally, positive and negative energies in these fluctuations exactly balance. But in the opinion of most cosmologists, the Big Bang was a stabilized vacuum fluctuation. All the matter, energy, space and time in the universe inflated from a tiny volume of dynamic vacuum during this event.

An echo of this most creative event in the universe’s history occurs in every molecule. Not all vacuum fluctuations can fit between adjacent molecules. A fraction of the Van der Waals force holding molecules together is produced by the pressure of these vacuum fluctuations.

With astrophysicist Bernard Haisch [6], I assumed that a proto-consciousness field operates through vacuum fluctuations or is identical to these fluctuations. I developed a very simple “toy model” in which this field produces a form of primitive consciousness by its interaction with molecular matter in the Casimir Effect (Fig. 1).

Fig. 1. A “Toy Model” of Proto-Panpsychism.


But models, no matter how simple or complex, are useful in physics only if they can be validated through experiment or observation. So I conducted a Google search for “Star Kinematics Anomaly and Discontinuity”.

Contrary to my expectation, what appeared on my screen was amazing. There was a Soviet-era Russian astronomer named Pavel Parenago (1906-1960). In addition to his astronomical contributions, Dr. Parenago was a very clever man. Unlike many of his colleagues, he avoided an extended vacation in a very cold place by dedicating a monograph to the most highly evolved human of all times – Joseph Stalin!

The anomaly named after Parenago, which is referred to as “Parenago’s Discontinuity”—is his observation that cool, low-mass stars in our galactic vicinity (such as the Sun) move around the center of the Milky Way galaxy a bit faster than their hotter, higher-mass sisters.

I used two sources to quantify Parenago’s Discontinuity for nearby main sequence stars. One was a chapter in Allen’s Astrophysical Quantities, a standard reference in astrophysics [7]. The second was a compilation of observations of 5610 main sequence stars using the European Space Agency (ESA) Hipparcos space observatory out to a distance of ~260 light years [8]. Figure 2, a graph presenting this data, is also included in my June 12, 2012 contribution to this blog and the JBIS paper based on my contribution to the BIS Stapledon symposium [9].

In Fig. 2, star motion in the direction of galactic rotation is plotted against star (B-V) color index, which is a measure of the difference between star radiant output in the blue range of the spectrum and the center of the human eye’s visual sensitivity. Hot, blue, massive stars have low and negative (B-V) color indices. From Table 19.1 of Ref. 7, G spectral class main sequence stars such as the Sun have (B-V) color indices in the range of about 0.6-0.7.

Fig 2: Solar Motion in Direction of Galactic Rotation (V) for Main Sequence Stars vs. Star Color Index (B-V). Diamond Data Points are from Gilmore & Zelik. Square. Data Points are from Binney et al.


Note in Fig. 2 that cooler stars to the right of the discontinuity move as much as ~20 kilometers per second faster than their hotter sisters around the center of the galaxy. As discussed in the June 12, 2012 contribution to this blog and in Ref. 9, Parenago’s Discontinuity occurs near the point where stable molecules begin to appear in stellar spectra.

Recent Work and Consideration of Alternative Hypotheses

Science is essentially a testing ground of alternative hypotheses to explain observational and experimental data. Since data points to at least the local reality of Parenago’s Discontinuity, some astrophysicists have developed rival explanations to Volitional Stars.

One possibility is stellar boil-off from local stellar nurseries. Perhaps this results in faster motions for cooler, low mass stars. But this process should result in a greater velocity dispersion in low mass stars, not a higher velocity of revolution around the galaxy’s center. Also, stellar nurseries typically live for tens of millions of years [10]. Why is there no discontinuity in the motions of short-lived O and B stars?

If Parenago’s Discontinuity is a local phenomena extending out a few hundred light years from the Sun, at least one other alternative explanation is possible. This is the Spiral Arms Density Waves concept [11]. The matter density of the interstellar medium is not uniform. Although the typical density of ions and neutral atoms in the Sun’s vicinity (the so-called Intercloud Medium) is less than 0.1 per cubic centimeter, matter density in the cooler, mostly neutral diffuse nebula that operate as stellar nurseries in the spiral arms of our galaxy is orders of magnitude greater. If a dense diffuse nebula passed through our galactic vicinity in the distant past, low-mass, cool, redder stars might be dragged along faster by the dense cloud than hot, blue, more massive stars.

There are at least two ways to check the validity of the Spiral Arms Density Waves hypothesis. One is to investigate the typical size of diffuse nebula in the Milky Way galaxy. The second is to check observational consequences of this hypothesis.

In a recent book, I reviewed the sizes of diffuse nebula in Messier’s compilation [12]. As part of a recent research paper, I performed a similar review of the more comprehensive Herschel catalog and an on-line listing of New General Catalog (NGC) deep-sky objects [13]. These results are summarized in Fig. 3.

Fig 3: Fraction of Galactic Bright Diffuse Nebulae with Diameters > D Light Years from Messier (Blue), Herschel (Green) and Atlas of the Universe—NGC (Yellow) Compilations.


Note in Fig. 3 that, in all three compilations of deep-sky objects, diffuse nebulae with diameters greater than a few hundred light years are rare. Since the Hipparcos main sequence dataset used in Ref. 8 includes stars in a ~500 light year diameter sphere, Fig. 3 does not support the Spiral Arms Density Wave hypothesis.

But there is worse news for this hypothesis, also derived from Hipparcos data. Giant stars are considerably brighter than their less evolved counterparts on the main sequence and
are consequently visible over greater distances. Richard Branham, an astrophysicist based in Argentina, has analyzed the kinematics of thousands of giant stars in the Hipparcos data set [14]. His conclusion that Parenago’s Discontinuity is present in these results is demonstrated in Fig. 4.

Fig 4: Giant Star Motion (V) in Direction of Sun’s Galactic Revolution. The reduction of Branham’s data to produce Fig. 4 is discussed in Chap. 23 of Ref. 12.


Note that Fig. 4 is not as neat as the corresponding results for main sequence stars in Fig. 2. This may be due to uncertainty in the > 1,000 light year distance estimates for many of the stars in Branham’s Sample.

An interpretation of the above results is that a local explanation for Parenago’s Discontinuity is unlikely. Existing galactic diffuse nebula are simply too small (and widely separated, as discussed in Ref. 12) to produce a stellar kinematics anomaly over a radius greater than 1,000 light years.

However, although the existing data does not support Spiral Arms Density Waves, the sample of stars, which numbers in the thousands, is not large enough to rule out this and other local explanations for Parenago’s Discontinuity. After all, the Milky Way galaxy contains more than a hundred billion stars.

Within the next few years, astrophysicists should know conclusively whether Parenago’s Discontinuity is a local or galactic phenomenon. In December 2013, the European Space Agency (ESA) launched Gaia as a more capable successor to the Hipparcos space observatory. While Hippasrcos accurately determined the distance and motions of perhaps 100,000 stars,
Gaia should gather similar data over the next few years for about a billion stars in the Milky Way galaxy. Gaia, its mission and capabilities are discussed in more detail in Ref. 12.

Fig 5: The European Space Agency’s Gaia Space Observatory (Courtesy ESA).


But even before the data from Gaia is analyzed and released, astronomers using different equipment have gathered preliminary data that may lead to the falsification of the Spiral Arms Density Waves hypothesis. Note in Fig. 6 the structure of M51, a typical nearby spiral galaxy not dissimilar from the Milky Way. The revolution of this galaxy is in the counterclockwise direction, from our point of view. Hundreds of millions of years are required for one
complete revolution [15].

A team of astronomers have carefully analyzed the light received from the leading and lagging edges of spiral arms of twelve nearby spiral galaxies. For the Spiral Arms Density Waves Hypothesis to be correct, differences should be observable between these two locations. Sadly for Density Waves (and happily for Volitional Stars), such an effect was not noticed.

Fig 6: The Whirlpool Galaxy M51 (courtesy NASA).


Since the universe contains ~100 billion spiral galaxies, this result is not conclusive. Using new telescopes, about 300 spirals should be observed to statistically rule out Density Waves. Density Waves is apparently limping, but it cannot yet be completely ruled out.

If observations from Gaia indicate that Parenago’s Discontinuity is a galactic phenomenon rather than a local phenomenon, some astrophysicists will attempt to develop explanations that are alternatives to Volitional Stars. As discussed in Ref. 13, this will be challenging. The only reasonable galaxy-wide explanation might be a collision between the Milky Way galaxy and another large galaxy in the distant past. While such a collision might have produced a galaxy-wide “starburst” episode of rapid star formation, simulations indicate that the ultimate result of such galaxy smash-ups is a giant elliptical galaxy, not a spiral such as the Milky Way.

Volitional Star Kinematics

In my June 12, 2012 contribution to this blog, I considered methods that a volitional star could use to adjust its galactic velocity. One possibility was stellar jets.

Many infant stars eject high-velocity matter streams (Fig. 7). Surprisingly, some of them are unipolar or unidirectional, ejecting more material in one direction than others [16]. In April 2015, Paul Gilster e-mailed a link indicating that solar winds from mature stars like the Sun
enter interstellar space in a complex system of jets [17]. The complexity of these jets is at least partially due to solar galactic motion and the interaction between the solar and galactic magnetic fields. Uni-directional matter jets from infant and young stars are discussed in greater detail in Chap. 15 of Ref. 12.

Fig 7: A Jet of High-Velocity Material Ejected From an Infant Star (courtesy NASA).


If Gaia observations reveal that Parenago’s Discontinuity is a galaxy-wide phenomenon, attention might turn to these unidirectional stellar jets. Are they generally aligned to accelerate molecule-bearing stars in the direction of their galactic motion? Since star galactic revolution velocities generally increase with distance from the galactic center, do jet velocities increase as well?

Although unidirectional material jets from infant and mature stars is one method that a volitional star could use, there is another possibility. This is the admittedly very controversial possibility of a weak psychokinetic (PK) force. Much has been written about the investigation of PK and related paranormal phenomena funded by US intelligence agencies.

As I have described in my earlier treatments of this subject, this is the only scientific controversy that I am privileged to know participants on opposing sides. On one hand are the physicists who claim that Uri Geller, the alleged psychic who scored best on their screening tests, could not possibly have cheated on these tests. On the other hand, I met a retired Time-Warner editor at a cocktail party years ago who demonstrated that Geller’s signature fork bending could be duplicated as a magic trick, and who also claimed to have enlisted a magician The Amazing Randi, to further investigate Geller.

Many web sources conclude that Geller is indeed a trained magician. When my friend Dr. Eric Davis of the Institute for Advanced Studies at Austin (Texas) mentioned (while reviewing a draft copy of Ref. 12) that there is no confirmation of Geller actually having attended a magician’s college, I decided to check what I consider the best reference available on the Geller-Randi controversy. I carefully checked a book by MIT physics professor David Kaiser on this topic and learned that Dr. Davis is apparently correct [18].

Eric Davis also sent me an electronic copy of a report he authored for the US Air Force in 2005. Many countries other than the US have investigated PK and related phenomena in studies funded by government agencies. Some of the results are positive and have reportedly been replicated [19, 20].

As discussed in Refs. 9 and 12 and my June 12, 2012 submission to this blog, a PK force required to accelerate a Sun-like star by 20 km/s during a ~1-billion-year time interval is many orders of magnitude less than that required to bend a kitchen utensil. Perhaps it is time for experimental physicists to put the Geller-Randi controversy aside and perform a new set of carefully controlled experiments to test the existence or non-existence of a weak PK effect.

One possibility discussed by others is to include professional magicians on the experiment design team. Another possibility, raised by a responder to my June 12, 2012 contribution to this blog, is to perform PK tests on the interaction between human subjects and an Einstein-Bose condensate. As further discussed in Ref. 12, an Einstein-Bose condensate is a macroscopic state of matter in which all of the particles share the same quantum state. A human subject might be instructed to see if he or she could “will” the condensate to climb the enclosure wall repeatedly to the same level. This would test not only the validity of PK but the assumption that consciousness is related to quantum phenomena.

Conclusions: A Learning Experience

Since 2011, I have spent a large fraction of my creative time investigating whether the Volitional Star hypothesis can be considered scientific. As reviewed in Ref. 12, it is certainly a venerable concept. Shamans, astrologers, philosophers, mystery-cult members, poets, and fiction authors have considered this possibility for millennia.

It is also interesting that at least a few scientists have walked this path before me. Although the concepts of stellar or universal consciousness are certainly not in the scientific mainstream at present, scientific speculation along these lines is becoming more respectable.

One creative group that apparently welcomes these concepts is fine artists. The chapter frontispiece art in Ref. 12 created by C Bangs has been presented in several artistic forums, including the Arts Program at the 9th IAA Symposium on the Future of Space Exploration, which was held in Turin, Italy in July 2015. A version of one of these images is presented as Fig. 8. Modifications of 18 of these images on 11” X 14” panels painted on both sides in the form of an accordion book are on display at the Manhattan gallery that C Bangs is affiliated with: Central Booking Art Space, 21 Ludlow Street.

Fig 8: Modified Version of C Bangs Chapter frontispiece from Starlight, Starbright.


Recently, with my assistance, C prepared an Artist’s Book entitled Star Bright?. In July 2015, Star Bright? was collected by the Prints and Illustrated Books division of the Museum of Modern Art in Manhattan.

It is of course very premature to claim that the work presented here has proven the case for volitional stars. The toy model of proto-panpsychism is certainly too simple to have much traction in the theoretical world. But it is not impossible that this work might move panpsychism from the realm of deductive philosophy to the realm of observational astrophysics.


1. E. H. Walker, “The Nature of Consciousness,” Mathematical Biosciences, 7, 131-178 (1970). Also see E. H. Walker, The Physics of Consciousness, Perseus, Cambridge, MA (2000).

2. B. Aldrin and J. Barnes, Encounter with Tiber, Warner, NY (1996).

3. L. Margulis, “The Conscious Cell”, Annals of the New York Academy of Sciences, 929, 55-70 (2001).

4. S. Hameroff, “Consciousness, the Brain, and Spacetime Geometry”, Annals of the New York Academy of Sciences, 929, 74-104 (2001) and R. Penrose, “Consciousness, the Brain, and Spacetime Geometry: An Addendum”, Annals of the New York Academy of Sciences, 929, 105-110 (2001).

5. H. Genz, Nothingness: The Science of Empty Space, Perseus, Cambridge, MA (1999).

6. B. Haisch, The God Theory, Weiser, San Francisco, CA (2006).

7. G. F. Gilmore and M. Zelik, “Star Populations and the Solar Neighborhood,” in Allen’s Astrophysical Quantities, 4th ed. A. N. Cox ed., Springer-Verlag, NY (2000), Chap. 19.

8. J. J. Binney, W. Dehnen, N. Houk, C. A. Murray, and M. J. Preston, “Kinematics of Main Sequence Stars from Hipparcos Data,” Proceedings of the ESA Symposium Hipparcos Venice
, SP-402, Venice, Italy, 13-15 May 1997, pp. 473-477 (July, 1997).

9. G. L. Matloff, “Olaf Stapledon and Conscious Stars: Philosophy or Science?”, JBIS, 65, 5-6 (2012).

10. E. Chaisson and S. McMillan, Astronomy Today, 6th ed., Pearson-Addison/Wesley, San Francisco, CA (2008), Chap. 19.

11. R. S. DeSimone, X. Wu, and S. Tremaine, ”The Stellar Velocity Distribution of the Stellar Neighborhood”, Monthly Notices of the Royal Astronomical Society, 350, 627-643 (2004).

12. G. L. Matloff and C Bangs, Starlight, Starbright: Are Stars Conscious?, Curtis Press, UK (2015).

13. G. L. Matloff, “The Non-Locality of Parenago’s Discontinuity and Universal Self Organization”, IAA-FSE-15-06-03. Presented at 9th IAA Symposium on the Future of Space Exploration, Turin, Italy, July 7-9, 2015. Published in Conference Proceedings.

14. R. L. Branham, “The Kinematics and Velocity Ellipsoid of GIII Stars,” Revisita Mexicana de Astronomia y Astrofisica, 47, 197-209 (2011).

15. K. Foyle, H.-W. Rix, C. Dobbs, A. Leroy, and F. Walter, “Observational Evidence Against Long-Lived Spiral Arms in Galaxies,” Astrophysical Journal, 735 (2), Article ID = 101 (2011), arXiv: 1105.5141 [astro-ph.CO].

16. F. Namouni, “On the Flaring of Jet-Sustaining Accretion Disks”, Astrophysical Journal, 659, 1505-1510 (2007).

17. I. O’Neill, “Sun May Blast Two Jets of Plasma into Interstellar Space”,, (March 4, 2015). Also see “A New View of the Solar System: Astrophysical Jets Driven by the Sun”, (February 19, 2015).

18. D. Kaiser, How the Hippies Saved Physics, Norton, NY (2011).

19. E. W. Davis, “Teleportation: Mind and Intelligence”, Report to the US Air Force Future Technology Branch, Future Concepts and Transformation Division Workshop, Mitre Corporation, McLean VA (Oct. 21, 2005).

20. E. W. Davis, “Teleportation Physics Study,” Final Report AFRL-PR-ED-TR-2003-0034, Air Force Research Laboratory, Air Force Materiel Command, Edwards AFB, CA (2004):