abundance of elements in universe
the amount of hydrogen in the universe
74%
the amount of moons that venus has
none
the estimated amount of stars in our galaxy
about 200 billion
why do stars shine
they shine because of nuclear fusion
what causes a supernova in a star
the star trying to fuse iron
the amount of helium in the universe
24%
the planets that are still geologically active
earth and maybe venus
the amount of light years across the galaxy
about 100,000 light years
where do stars burn
at the center
how are stars born
nebulas collapse and form hot cores and they turn into stars
the oldest stars in the universe
red dwarfs
the age of saturn's rings
no one knows
the milky way is made out of other galaxies
true or false
true
what are stars mostly made of
hydrogen and helium
how are properties of stars determined
by there mass
red dwarfs age
about 12 billion years old
the planets that are made mostly of gas
the outer four
there is a black hole at the center of the milky way
true or false
true
what makes the molecules in a star fuse
the collisions of atomic nuclei
are red stars hotter or cooler than white stars
red stars are cooler than white stars