Asteroid and Comet Deflection

Spacecraft and Their Messages

January 16, 2014

Just over 8300 people have now signed the petition supporting the New Horizons Message Initiative. The approach of the 10,000 figure reminds me to jog those who haven’t to stop by the site to sign the petition. For those not yet aware of the NHMI, the idea is to upload a crowdsourced package of images […]

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What a Strange Asteroid Can Tell Us

November 14, 2013

The Pan-STARRS survey telescope in Hawaii has reminded us how much we still have to learn about asteroids. We saw yesterday that the Chelyabinsk impactor could be studied through physical evidence as well as the ample photographic records made by witnesses on the ground. But P/2013 P5, discovered by Pan-STARRS and then the object of […]

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Piecing Together the Chelyabinsk Event

November 13, 2013

We’re still trying to learn how frequently asteroid events like the spectacular fireball over Chelyabinsk occur. The Chelyabinsk object was the largest to fall to Earth since the Tunguska explosion in 1908, which leveled thousands of acres of forest in Siberia. This BBC story discusses Peter Brown (University of Western Ontario) and colleagues’ recent paper […]

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Riding on Comets’ Coat-tails

September 13, 2013

Voyager 1 is now an interstellar spacecraft, according to the latest reports (and I’ll have thoughts on Voyager, its progress and its implications, on Monday). For today, though, Keith Cooper is envisioning other ways of going interstellar, methods that take advantage of natural objects like comets. Can we harness their resources and change the paradigm […]

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‘Graveyard Comets’ in the Asteroid Belt

August 7, 2013

When we study extrasolar planetary systems, we’re seeing stars and planets in a wide variety of ages and configurations, helpful in making sense out of our own system’s past. New work out of the University of Antioquia (Medellin, Colombia) suggests changes to the main belt of asteroids between Mars and Jupiter of a kind that […]

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Into the Orion Arm

March 28, 2013

Although we have little observational data to go on, the existence of the Oort Cloud simply makes sense. We see new comets coming into the inner system that are breaking up as they approach the Sun, obviously not candidates for long survival. There has to be a source containing billions of comets to account for […]

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Life Among the Comets

March 27, 2013

It’s hard to imagine a sane human being who would choose to live in the Oort Cloud, on a colony world where the outside temperature is in the single digits Kelvin and small bands of maybe 25 each would tend to the problems of energy production and resource extraction. Human contact beyond this would be […]

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Near-Misses and their Uses

February 18, 2013

We can hope that the celestial events of February 15, including the spectacular fireball over Chelyabinsk and the near-miss from asteroid 2012 DA14, have raised public consciousness about Earth’s neighbors in space. And indeed, this seems to be the case. Media outlets were flooded with articles, photos and video, and talk show hosts found themselves […]

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Deep Space Industries: Mining Near-Earth Asteroids

January 22, 2013

Deep Space Industries is announcing today that it will be engaged in asteroid prospecting through a fleet of small ‘Firefly’ spacecraft based on cubesat technologies, cutting the costs still further by launching in combination with communications satellites. The idea is to explore the small asteroids that come close to Earth, which exist in large numbers […]

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Astrobiology: The Necessity of Asteroids

November 2, 2012

Let’s talk this morning about the ‘snow line,’ the boundary in the Solar System beyond which volatiles like water ice remain cold enough to keep intact. Rebecca Martin (University of Colorado) and Mario Livio (Space Telescope Science Institute) have been running simulations using models of planet-forming disks around young stars. The idea: To calculate the […]

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