The smallest piece of a chemical element ATOM
The red planet - has evidence of river beds MARS
A planet's natural satellites, like Io and Europa MOON
Streaking object composed of ice and gas COMET
Third rock from the sun EARTH
Smallest, darkest and coldest planet found in 1930 PLUTO
A galaxy is composed of millions of __ STARS
Hot, dense, and acidic planet; closest to Earth VENUS
Spinning clouds of stars, dust, and gas GALAXY
A shooting star METEOR
A galaxy-sized cloud of dust and gas; Crab __ NEBULA
Planet surrounded by rings of icy rock and gas SATURN
The dog star - The brightest star visible from earth SIRIUS
Cold, barren planet named for the Greek sky god URANUS
One theory of how the universe was created BIGBANG
Force that attracts two masses to each other GRAVITY
This comet orbits the sun every 76 years HALLEYS
Biggest planet by far JUPITER
The planet closest to the sun MERCURY
Has a stormy surface with 1200 mph winds NEPTUNE
Our Galaxy MILKYWAY
Nearest neighboring galaxy - 2.2 mil. Light years away ANDROMEDA
Chunks of rock, mainly between Mars and Jupiter ASTEROIDS
Forms when a large star collapses, no escaping it BLACKHOLE
The explosion of a large star SUPERNOVA
Shape of the Earth's orbit ELLIPTICAL
How distance is measured in space LIGHTYEARS
Group of stars connected to form an image CONSTELLATION