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1. Asteroids are by far the only celestial bodies that can be named by their discoverers.

2. Two expensive telescopes to focus on dangerous asteroids have been proposed, but Congress and the incoming Obama administration must be persuaded to approve the money.

3. Comets are far less numerous than asteroids but are rather more worrying, as they are largely an unknown entity.

4. NASA is under presidential direction to focus more on outer space, beginning with expeditions to asteroids and then Mars.

5. Such asteroids are much bigger than the meteor that hit the atmosphere over Russia.

6. The NEO program normally looks for asteroids and comets that could pose a hazard to Earth.

7. The rock dust closely resembles material from bodies called chondritic meteorites from asteroids in the asteroid belt between Mars and Jupiter.

8. Earth is menaced all the time by meteors, which are chunks of asteroids or comets that enter Earth's atmosphere.

9. Astronomers know of no asteroids or comets that pose a major threat to the planet.

10. Scientists hope the probe will give them information about the formation of asteroids.