Big Bang Basics
The theory that the universe began expanding from a single, hot, dense point.
The Big Bang Theory
In 1929, this astronomer studied the light from distant galaxies.
Edwin Hubble
This happened first.
The Big Bang
This unit measures distances between galaxies.
This unit measures distances between galaxies.
On an H-R diagram, the hottest stars are on this side.
The left side
The universe is about this old.
13.8 billion years
Light that is stretched to longer wavelengths is called this.
Redshift
These formed right after protons and neutrons.
Hydrogen and helium atoms
A planet travels fastest at this point in its orbit.
Perihelion
In a diagram of an orbit, the Sun sits here.
At a focus of the ellipse
Since the Big Bang, the universe has been expanding and doing this.
Cooling
A redshifted galaxy is doing this relative to us.
Moving away from us
After hydrogen and helium atoms, these formed.
The first stars
The most common type of star, which burns for trillions of years.
A red dwarf
In a diagram of the Sun, this is the outermost layer.
The corona
The first particles to form after the Big Bang.
Protons and neutrons
This leftover glow from the early universe is found evenly in all directions.
Cosmic microwave background radiation
As the universe expands, the total amount of energy does this.
It stays constant
This has the stronger surface gravity: a neutron star or a white dwarf.
A neutron star
In the life cycle diagram, a red supergiant leads to this.
A supernova
Carbon and oxygen were first made here.
Inside stars
The farther away a galaxy is, the ____ it moves away.
Faster
Put in order: stars, protons and neutrons, carbon and oxygen, hydrogen and helium.
Protons and neutrons, hydrogen and helium, stars, carbon and oxygen
A new planet orbits between Mercury and Venus. Its average speed is compared to those two planets this way.
Slower than Mercury but faster than Venus
What decides whether a supernova leaves a neutron star or a black hole.
How much mass the core has left