Our World
Meteors that have fallen to Earth are called ______________________.
meteorite
The Sun is an example of a _______________.
star
Objects in the solar system stay in orbit (are kept nearby) because of the Sun’s _________________.
gravity
You are from the _________________ galaxy.
Milky Way
_______ _______ is the distance light can travel in a year.
light year
What protects Earth from a great number of significant impacts from meteors?
atmosphere
Earth rotates on its axis every ____ _______.
24 hours
Jupiter, Saturn, Uranus, and Neptune are classified as _______ planets.
Outer
A small object made of dust and ice that revolves around the sun is called a _______________.
comet
This type of galaxy consists of a rotating disk of young stars, gas and dust and a central bulge made of older stars.
Spiral Galaxy
What is a natural satellite?
moon
The region of space between Mars and Jupiter where most asteroids are found is called the _____________________.
Asteroid belt
A hole in the surface of a larger object caused by a fallen meteorite is called a ___________.
crater
____ are huge balls of hot, glowing gases that produce their own heat and light.
Stars
Stars are classified by their _______, temperature, _________ and size.
color; brightness
What astronomical event occurs during a new moon when Earth moves into the moon's shadow?
solar eclipse
Some planets have many of these. Earth has one and Venus and Mars have none.
moons
A ___________ planet is a planetary-mass object that is neither a planet nor a natural satellite.
dwarf planet
A _______________ is of vast size, with millions of stars and millions of light years in diameter.
Galaxy
This galaxy is made of young stars in the center and has two or more spiral arms. This is the type of galaxy that the Milky Way is classified as.
Barred Spiral Galaxy
All planets ______ on an axis.
rotate
Mercury, Venus, Earth and Mars are classified as ______ planets.
Inner
This planet is tilted so far on its axis that it rotates on its side.
Uranus
Why do some stars appear brighter than others in the sky?
They are closer to the Earth.
This type of galaxy has no particular shape and the stars are randomly scattered throughout. There is a lot of dust and gas to form new stars.
Irregular galaxy