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Transcript
The Universe and Solar System Vocabulary Part Two
Comets
A small body if ice, rock, and cosmic dust that follows an
elliptical orbit around the sun. It gives off gas and dust in the
form of a tail as it passes close to the Sun. The tail always
points away from the Sun due to solar winds.
Asteroids
A small, rocky object that orbits the Sun, usually in a band
called the asteroid belt between the orbit of Mars and Jupiter.
Meteoroid
Small, rocky body that travels through space.
Meteor
Bright streak of light that results when a meteoroid burns up
in the Earth’s atmosphere. Sometimes called a “shooting star”.
Meteorite
A meteoroid that reaches Earth’s surface without burning up
completely.
Galaxies
A collection of stars, dust, and gas bound together by gravity.
Milky Way Galaxy
Our solar system is located in this galaxy.
Big Bang Theory
Theory that states that the universe began with a tremendous
explosion where all matter and energy was concentrated. The
universe is expanding outward. According to this theory, the
universe is about 13.7 billion years old. One way scientists
calculate the age of the universe is measure the distance from
Earth to various galaxies.