big bang, stars, & galaxies
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16 Terms
Universe began in a big bang
14 billion years ago
what began in the big bang
Time space and matter
When universe was one second old →
protons and neutrons
Three minutes after big bang →
temp dropped below 1 billion degrees celcius
After 300,000 years in big bang →
universe cooled about 3000 degrees.
As millions of years passed, dense areas pulled in material because of more _______
gravity
100 million years after big bang →
gas became dense enough for stars to be born
________ help us see galaxies created 1million years post big bang
Hubble space telescopes
Center of galaxies
A supermassive black hole, acting as a massive, invisible gravitational anchor.
Galaxies are huge rotating collections of
gas, dust, billions of stars, planets, and other celestial objects
Our milky way has more than
200 billion stars.
Milky way is __ light years across
100,000
Black holes are made when
a star that is 30 times heavier than the sun dies and leaves a core so massive that is collapses under its own weight
Elliptical galaxy shape →
spherical, oval shaped
Spiral shape →
looks like pin wheels
Lenticular →
central bulge surrounded by first disk or gas
