ch 21-25pt2
How is the universe expanding?
because of the red shift from galaxies. it shows that galaxies are moving away from Earth
what are the order of the planets
Mercury, Venus, Earth, mars, Jupiter, Saturn, Uranus, Neptune.
How to stars get their energy
from nuclear fusion
what are the 4 inner planets known as
the terrestrial planets because they are mostly made of rock
what happens after nuclear fusion
it becomes a red giant and then a white dwarf. For larger starts it becomes red giants then neutron star. for even bigger stars it becomes super giant then black hole
what are the 4 outer planets known as
gas giants because they are made of helium and hydrogen
what is a nebula
a cloud of gas/dust from which stars form
Moon facts
Moon revolves around the Earth and it takes an average of 29.53 days. WAXING is sunlit fraction that gets bigger and appears on the right WANING sunlit fraction gets smaller and appears on the left
The big bang theory is the theory that all matter in the univers came to a single point and there was an explosion. it is said that it formed all the galaxies.