Everything revolves around ___________.
Stars are made of mostly which two gases?
A star is born in a cloud of gas and dust called a __________.
Stars give off heat and light in a process called ___________.
In the process of nuclear fusion, hydrogen atoms combine to form ___________ atoms.
Billions of stars are held together in groups called __________.
Our Sun is part of which galaxy?
The luminosity of a star describes its ______________.
As the _________ of a star increases, luminosity increases.
What color are the coolest stars?
What color are the hottest stars?
The types of gases that make up a star is also known as the star's _______________.
Stars that are much bigger than the Sun are called _______________.
Stars that are much smaller than the Sun are called _________________.
A tool that astronomers use to learn about the composition of a star is called a _______________.