Space Basics
Earth is part of this system, which includes the Sun and all objects that orbit it.
Solar System
Our galaxy is called this.
The Milky Way
Of these two stars, blue or red, this color represents the hotter star.
Blue
A star can have high luminosity but appear dim from Earth because it is extremely ______.
Far Away / Distant
Massive stars can end their lives in this enormous explosion, which can leave behind a neutron star or black hole.
Supernova
This is the natural satellite that orbits Earth.
The Moon
According to what you learned about the universe, a galaxy can contain billions of these objects.
Stars
The color of a star gives astronomers information about this characteristic.
Temperature
If the same flashlight is moved farther away from you, its apparent brightness will do this.
Decrease
Stars begin their lives forming inside enormous clouds of gas and dust called these.
Stellular Nebula
This is the name for everything that exists, including all matter, energy, space, and time.
The Universe
This type of galaxy has curved arms extending outward from its center.
Spiral Galaxy
A star is a huge ball of extremely hot gas that produces its own ______.
Light / Heat
This describes the total amount of energy a star gives off as light each second.
Luminosity
This is the longest major stage of a star's life, when it produces energy by fusing hydrogen into helium.
Main Sequence
Put these in order from smallest to largest: solar system, universe, galaxy, planet.
planet → solar system → galaxy → universe
This type of galaxy generally has a smooth, rounded shape and contains mostly older stars.
Elliptical Galaxy
Put these star colors in order from hottest to coolest: red, blue, yellow, white.
blue → white → yellow → red
The two things that determine gravity.
Mass & Distance
A star like our Sun eventually expands into this stage after it runs out of hydrogen in its core.
Red Giant
What is the 5th planet from the Sun?
Jupiter
This type of galaxy does not have a clear spiral or elliptical shape.
Irregular Galaxy
Once ______ ______ begins in a star, it reaches the main sequence phase of its life.
Nuclear Fusion
This describes how bright a star appears to an observer on Earth.
Apparent Brightness / Magnitude
This is the stage when a young star begins forming from material within a nebula.
Protostar