Stars Flashcards
(32 cards)
What is a star
A star is a bright ball very hot gas held together by its own gravity
A star is made up by wht
Hydrogen and helium
A star
is a process called what to produce heat and light
Nuclear fusion
Stars are usually between how many years old
10 billion
The sun is the closest star to the earth and is estimated to be how many years
Four. 5 billion
Where do stars come from
Stars form from a nebula
What type of stars are there
Different types of stars are classified based on their color and temp
Very hot hot stars give off what color
Blue
Cooler stars give off what color
Red
What star is most common
Red dwarf star
What do red dwarf stars do
They burn their fuel very slowly this allows them to last long as 100 billion years
What is a brown dwarf star
A brown dwarf star is a star that did not get hot enough to trigger a nuclear fusion and gives us very dim light
What type of star is our sun
The sun is a yellow dwarf star
What is a yellow dwarf star
Yellow dwarf star begins to run out of hydrogen their core shrinks becomes hotter and pushes out into a red giant
What do supergiant stars do
Supergiant stars make our summer tiny in comparison as they can be 20 times the mass of our sun and beat 1000 times the size of many stars
Each galaxy contains how many stars
About hundreds of billions
How many galaxies do scientists think there are
Scientist estimate there are over 100 billion galaxies in the universe
Our Milky Way galaxy contains between how many
Our Milky Way galaxy contains between how many stars Between 200 and 400 billion stars
What is our closest star system
Alpha centauri
The sun is about how many times bigger than the earth
864,000
Why don’t we see stars in the daytime
Because the sun is so bright the light covers the light from the stars but at night there is no light from the sun so the stars shine
Just like the sun doesn’t revolve around the earth what doesn’t either
Stars
What is the distance from the sun to the earth
93 million Miles
How many miles equals one astronomical unit
93 million Miles
