How did the Solar System Form?

The Milky Way galaxy is one of many galaxies in the universe. Earth, where we live, and its solar system are part of the Milky Way galaxy.

Our solar system consists of the sun and a collection of objects, including planets, their moons, and asteroids that are held in orbit around the sun by its gravitational pull on them. The solar system appears to have formed from a disk of dust and gas, drawn together by gravity.

• I don't get it.

• GOT IT!

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What is at the center of our solar system?

• The Moon, a gravity rounded body of planetary mass that orbit Earth

• The asteroid belt, rocks and stones that did not form planets

• The sun, a star or hot ball of glowing gas

• The Kuiper belt, a circumstellar disc extending from Neptune

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Our solar system consist of __________. (Check all that apply)

• Planets

• Moons

• Asteroids

• Comets

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How old is our solar system?

• Hundreds of years

• Thousands of years

• Millions of years

• Billions of years

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The solar system started of as __________ that collapsed (likely due to an explosion).

• a giant mass of rock

• a cloud of dust and gas

• a tremendous cube of ice

• a big ball of fire

Which part of the solar system formed first (before everything else started to clump together)?

• the sun

• planets

• asteroids

• comets

After the sun formed, the material left behind started to crash due to gravity and clump into big objects. Big objects collided with bigger objects to form large objects that orbit the sun called __________.

• planets and dwarf planets

• asteroids

• comets

• moons

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Rocky planets like Earth formed __________ the sun.

• nearest to

• farthest from

• inside

• in the same place as

Gaseous or icy planets like Neptune formed __________ the sun.

• nearest to

• farthest from

• inside

• in the same place as

A terrestrial planet has a solid rocky surface. In the solar system, these planets are closer to the sun and are therefore warmer than the planets located farther out in the solar system. These planets include __________.

• Mercury, Venus, Earth, and Mars

• Jupiter, Saturn, Uranus, and Neptune