Physics
The spectra type sequence
O, B, A, F, G, K, M
The spherical surface of a black hole
The most common star
The acronym for ordinary dark matter
MACHOS
The term that describes when the early universe underwent a period of rapid expansion
The spectra in which all colors are present
Continuous
The remnant of a planetary nebula
White dwarf
Young star cluster located in the disk with loosely packed stars
Open cluster
The most distant and most luminous object in the whole universe
Quasars
The rough age of the universe
14 billion years old
How bright an object appears to us on Earth
Apparent magnitude
"Failed stars"
Brown dwarfs
The Law that states "the faster a galaxy is moving away from us, the farther away it is
The Hubble Law
When two equal-sized galaxies merge it creates a(n)
Elliptical galaxy
The type of universe we live in
Flat, but accelerating universe
An object that absorbs all energy that hits it
Blackbody
Gravity and pressure are perfectly balanced (in main sequence stars)
Hydrostatic equilibrium
The gas and dust between stars
The Interstellar Medium (ISM)
When a large galaxy "eats" a smaller galaxy
Galactic cannibalism
This provides an outward push to accelerate the expansion of the universe
Dark energy
The method of measuring distance to very nearby stars
Spinning neutron stars
Pulsars
The group of first stars that only contained hydrogen and helium, with no metals
Population III stars
The lack of a preferred location in the universe
The cosmological principle
The name in which if the universe gets pulled back together
"The Big Crunch"