Astronomy

The Scientific study of the universe

• astronomy
• astronomical unit
• cosmology
• cosmotology

A collection of stars, dust, and gas bound together by gravity

• galaxy
• milky way
• solar system
• universe

the average distance between the Earth and the sun; approximately 150 million kilometers

• astronomical unit
• light year
• parsec
• electromagnetic spectrum

the spin of a body on its axis

• rotation
• revolution
• solstice
• equinox

the motion of a body that travels around another body in space; one complete trip along an orbit

• rotation
• revolution
• solstice
• equinox

The brightness of a star compared to our sun

• galaxy
• 
  luminosity

• light year
• geocentric

An earth centered system

• heliocentric
• galaxy
• asteroid
• geocentric

A group of stars in the nighttime sky that form a recognizable pattern

• constellation
• asteroid
• revolution
• meteroid

An irregularly shaped, rocky mass that orbits the sun

• meteoroid
• constellation
• galaxy
• asteroid

The measure of how oval a planet's orbit is

• revolution
• rotation
• eccentricity
• constellation