Astronomy

The Sun and all the objects orbiting it are known as ______.

• planets
• stars
• solar system
• asteroids

Terrestrial planets are ____.

• inner planets, rocky, and small
• inner planets, gaseous, and large
• outer planets, rocky, and small
• outer planets, gaseous, and large

Gas Giants are ____.

• inner planets, rocky, and small
• inner planets, gaseous, and large
• outer planets, rocky, and small
• outer planets, gaseous, and large

A unit used to measure long distances, equivalent to the distance from the Sun to Earth is referred to as ____.

• Astronomical Unit (AU)
• Sidereal Year (SY)
• Cosmic Scale (SS)
• Light Year

The source of the Sun's heat and light energy is ____.

• combustion gas
• fusion of hydrogen nuclei
• gravitational pressure
• burning of fossil fuels

Scientists measure distances beyond our solar system (such as between two stars or galaxies) using which of the following unit?

• Miles
• Kilometers
• Light years
• Meters

What information can you find on a H-R diagram?

• Where stars are located.
• Sizes of planets.
• Types and sizes of stars
• Shapes of objects in the solar system.

For average stars, like our Sun, what will it eventually become once it runs out of energy from nuclear fusion in its core?

• white dwarf
• black hole
• neutron star

The Milky Way is a ____ galaxy.

• irregular
• spiral
• elliptical

The two most common elements in the universe are _____ and helium.

• oxygen
• carbon
• hydrogen
• iron