When a white dwarf stops glowing, it is dead, then it becomes a...
Black Dwarf
100
When the most massive star dies, they become a...
Black Hole
100
The earliest stage of a star's life is call a...
Protostar
100
Even smaller and denser than white dwarfs, may contain as much as three times the mass of the sun but be only about 20 kilometers in diameter, this is called a...
Neutron Star
200
A distant galaxy with a black hole at its center
What is a quasar
200
Star systems with two stars are called double
Binary Stars
200
How can astronomers detect where black holes are
They can detect X-rays coming from the hot gas and infer that a black hole is present
200
Then a dying giant or supergiant star suddenly explodes, this is called a...
Supernova
200
A star system in which one star blocks the light from another star is a...
Eclipsing Binary
300
The blue-white hot core of the star that is left behind is a...
White dwarf
300
How do the astronomers think that the sun begun
By a black hole that became a supernova
300
All stars begin their lives as parts of nebulas True or False?
True
300
What does the double star Alpha Centauri A and Alpha Centauri B form with Proxima Centauri
A double star
300
The galaxy in which our solar system is located is called the...
The Milky Way
400
What galaxy looks like flattened balls
Elliptical Galaxies
400
groups of two or more starts are called...
Star Systems
400
How many galaxies are there in the universe
Billions
400
Stars with more mass last longer than start with less mass True or False?
False
400
What type are these galaxies
Milky Way Galaxy-
Large Magellanic Cloud-
Spiral Galaxy
Irregular Galaxy
500
When the contracting gas and dust become so hot that nuclear fusion stars
This is how a star is born
500
Which of these sentences are true
A.Elliptical galaxies contain only new stars
B.There is lots of gas and dust between the stars in the Milky Way Galaxy
C.The center of the Milky Way Galaxy is about 25,000 light years from the sun
D.All galaxies have regular shapes
C is true
500
A galaxy that has the shape of twin spirals is called a...
Spiral Galaxy
500
How can astronomers tell if there is an unseen second star in a system
They observe the effects of its gravity
500
How did astronomers deduce that the star called 51 Pegasi has a planet revolving around it
They knew the invisible object could not have enough mass to be a star, so they deduced that that must be a planet