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1. Scientists hypothesize that the sun formed ____. (1 point)
less than a billion years ago
from a cloud of gas and dust
less than a million years ago
from a chunk of Jupiter
2. Two of the inner planets are ____. (1 point)
Venus and Saturn
Mars and Venus
Earth and Pluto
Mercury and Jupiter
3. Pluto alters the orbit of which planet? (1 point)
Uranus
Saturn
Neptune
Jupiter
4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____. (1 point)
stars
meteors
meteorites
asteroids
5. ____ is the largest planet in the solar system, is the fifth planet from the sun, and has colorful clouds. One of its 17 moons is the most volcanically active object in the solar system. The planet has a liquid ocean and an atmosphere comprised mostly of hydrogen and helium. It may have a rocky core, although its extreme pressure and temperature would make the core different from any rock on Earth. (1 point)
Jupiter
Saturn
Uranus
Neptune
6. Water is found as a solid, liquid, and gas on ____. (1 point)
Mercury
Venus
Earth
Mars
7. Galileo used his telescope to discover evidence for the sun-centered model of the solar system. This evidence included all of the following EXCEPT ____. (1 point)
Venus going through phases
Venus revolving around the sun, not Earth
the discovery of Neptune and Pluto
both a and b
8. A main sequence star becomes a ____ after it uses up the hydrogen in its core. (1 point)
nebula
supernova
black hole
giant

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