Universe and the Solar System

Totality of all space and time.

Outer planets

Nearest planet to the sun

Nebular theory

Is a cloud of gases or dust in space

Heavenly bodies with so much heat pressure inside

Is an apparent arrangement of stars named after ancient beings.

Big assembly of stars, gas and dust held together by gravity.

Our habitat

Minor planet

composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid.

solid upper mantle material that is so hot that it behaves plastically and can flow.

rocks do not melt or disintegrate.

is hotter and denser than the upper mantle and transition zone.

the core-mantle boundary, or CMB, marks the end of the mantle and the beginning of Earth’s liquid outer core.

mostly made of iron and nickel.

is mostly composed of liquid iron and nickel.

hottest part of the core where temperatures reach 6,000° Celsius—as hot as the surface of the sun.

a hot, dense ball of (mostly) iron.