Documents WHAT ARE STARS? Huge, hot balls of gas that are trillions of kilometers away from the Earth.

WHAT ARE STARS? Huge, hot balls of gas that are trillions of kilometers away from the Earth. Astronomers study the COLOR of star light Which color is the hottest? Red and…

Documents Taking the fingerprints of stars, galaxies, and interstellar gas clouds Absorption and emission from...

Taking the fingerprints of stars, galaxies, and interstellar gas clouds Absorption and emission from atoms, ions, and molecules The periodic table of the elements The universe…