The density wave theory explains spurs and branches along the spiral arms.
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When a large galaxy collides with a small galaxy, the smalle…
When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces.
If the density of the universe is equal to the critical dens…
If the density of the universe is equal to the critical density, and H equals 50 km/s/Mpc, then the true age of the Universe is 13.3 billion years.
Most of the elements heavier than helium were made during th…
Most of the elements heavier than helium were made during the first few minutes after the big bang.
The chemical abundance of population I stars
The chemical abundance of population I stars
Evidence for a very early “super rapid” inflation of the uni…
Evidence for a very early “super rapid” inflation of the universe is that the 3-K radiation from opposite sides of the sky (i.e., 180 degrees or about 28 billion light years apart) is of nearly ___________ intensity. Time for light to travel this distance is ___________ the age of the universe in years.
The orbits of halo stars are typically circular and have a l…
The orbits of halo stars are typically circular and have a low inclination with respect to the disk.
The rapid fluctuations of quasars show that the energy emitt…
The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small.
The CMB is perfectly uniform.
The CMB is perfectly uniform.
Younger stars have more heavy elements because
Younger stars have more heavy elements because