Physical science Big Bang theory
Scientists think that the Big Bang occurred about
13.7 billion
Most scientists who study dark matter think that it is
A mix of ordinary matter and matter we haven't yet discovered
Universe
All the matter and energy that exists and all of space and time
After the Big Bang occurred, the universe
Began to cool
After the Big Bang, the universe became less dense and it's temperature
Cooled
The astronomer who concluded that the universe is expanding was
Edwin Hubble
Huge clumps of matter held together by....... eventually formed stars and galaxies
Gravity
The first element to form after the Big Bang was
Hydrogen
Big Bang Theory
Idea that explains how the universe formed
Scientists recently discovered that the universe
Is expanding even faster than before
The distance between galaxies appear to be getting
Larger
Dark matter
Matter that can be detected only by its effects on the motion of objects around it
From our point of view in the Milky Way galaxy, all other galaxies in the universe appear to be
Moving away from us
Hubble's law
Observation that the farther away a galaxy is, the faster is is moving away from us
Scientists have introduced the concept of dark energy to explain the
Rate of growth of the universe
According to the big bang theory
The universe began with an enormous explosion
Ordinary matter
less than half of the total matter in the universe
