22.26: The Solar System- Challenge 5
- Page ID
- 6209
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- 1. ___ extrasolar planets have been discovered so far.
- More than 1500
- 2. Scientists started discovering exoplanets in ___.
- 1990s
- 3. A planet is considered to be in a star's habitable zone when ___.
- it has the right temperature to have liquid water
- 4. Scientists are interested in asteroids because ___.
- many are representatives of the earliest solar system
- 5. ___ near-Earth asteroids cross Earth's orbit.
- More than 4,500
- 6. Long-period comets come from the ___.
- Oort Cloud
- 7. In the early solar system, comets that struck Earth may have brought ___.
- water
- 8. Before reaching Earth's atmosphere, meteors are known as ___.
- meteoroids
- 9. A meteor shower occurs when ___.
- Earth passes through a comet's tail
- 10. ___ are meteors that make it to Earth's surface.
- Meteorites
- 11. Eris has ___ known moon(s).
- 1
- 12. ___ is the largest known dwarf planet in the solar system.
- Eris
- 13. ___ is the third-largest and second-brightest dwarf planet discovered so far.
- Makemake