solar system
What is the closest planet to the sun
Mercury
what is a large burning ball of gas in space that generates heat and light by nuclear fusion of hydrogen into helium?
star
Milky way
These two objects orbit the sun, but are not planets
comets and asteroids
what is the closest star to the solar system beyond the sun
sirius
what has the longest orbital period
Neptune
How many stars does our solar system have
1
The adromeda galaxy is what type of galaxy?
spiral
When a meteoroid enters Earth's atmosphere, it burns and is called what
a meteor or shooting star
The universe is composed of what smaller unit?
galaxies
The hottest planet
Venus
A star's color is determined by this
temperature
What is the theory that the universe was created by an explosion?
Big Bang theory
If a meteor doesn't completely burn in the atmosphere, it may fall to Earth as a what?
meteorite
galaxies are composed of what smaller unit
solar systems
What force keeps the planets orbiting the sun
gravity
a star's life cycle depends on this
mass
The distance light travels in a year is this
Light year
These are made of ice and dust
comet
This outer planet is tilted on its side
Uranus
What else, besides planets, orbits the sun? There are two
comets and asteroids
Stars are born in a what
nebula
The longest stage of a star's life
Main sequence
This planet has many complex rings and 31 moons
Saturn
This has gravity so strong not even light can escape
black hole