star basics
What is a star mostly made of?
Hydreim and heleium
What do we call a cloud of gas and dust where stars are born?
A nebula
What type of star is the Sun?
A medium-sized yellow star
What do we call a small, hot, dense star that is the leftover core of a dead star?
A white dwarf
What does the H-R diagram show?
The relationship between a star’s brightness and its temperature.
DAILY DOUBLE⭐️⭐️-This is the force that causes gas and dust to clump together, beginning the formation of a new star.
What is gravity.
What do average-sized stars (like the Sun) become at the end of their life?
A white dwarf
About how old is the Sun?
4.6 billion years old
What type of star is extremely large and bright and near the end of its life?
A red giant
Where are most stars found on the H-R diagram?
The main sequence
What is the name of the process that powers stars?
Nuclear fusion
What explosion occurs when a massive star dies?
A super nova
What layer of the Sun do we see shining?
The photosphere
What is the name for the most massive and hottest type of star, which shines blue-white?
A blue supergiant
On the H-R diagram, where are the coolest and brightest stars located?
In the upper right (red giants
What color are the hottest stars?
Blue
What can a supernova of a very massive star create?
A black hole
What is the Sun’s energy source?
Nuclear fusion of hydrogen into helium.
What type of star is very small, very dense, and made almost entirely of neutrons?
A nuetron star
What type of stars are hot but not very bright, found in the lower left of the H-R
White dwarfs.
What unit do astronomers use to measure distances between stars?
Light years
What stage is a star in when it is stable and fusing hydrogen?
main sequence.
What is the name of the outer atmosphere of the Sun visible during a solar eclipse?
The corona
What type of star is very dim, very cool, and the smallest kind of main-sequence star?
A red dwarf
What two characteristics are used to plot a star on the H-R diagram?
Temperature and luminosity (brightness).