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1. When a cloud of gas and dust condensed to form the sun and planets, comets formed from what was left over.

2. Scientists debate when oceans first appeared and whether water formed on the planet or was brought here when icy comets struck it.

3. Without Jupiter's penchant for eating comets, life on Earth may not have survived.

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

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

6. Comets are debris left over from the formation of the solar system some five billion years or so ago.

7. Meteors come from tiny remnants of comets, which leave trails of dust and debris that the Earth slams into periodically.

8. The earring and pendants are comets, suspended in their asymmetrical shapes.

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

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