theory that the universe began as very hot, small, and dense, with no stars, atoms, form, or structure

a system of millions or billions of stars, together with gas and dust, held together by gravity

the Doppler effect is

red shift

Stellar distance is...

The Laws of Gravity were explained by whom

Copernicus' Theory said...

Hubble proved...

Telescopes are used for...

Scientists use the Hertzsprung-Russell diagram to...

Absolute magnitude is used to determine...

Apparent magnitude is used to describe...

The Solar Nebular Theory is...

Stellar evolution is ...

The Law of Gravity is...

The tendency of a body at rest to remain at rest or of a body in motion to stay in motion in a straight line unless acted on by an outside force

a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary at the same time

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