Star streams that are seen around the Milky Way Galaxy are probably the result of:
A) stars ejected from the Galaxy by gravitational encounters with the central black hole.
B) tidal interactions with satellite galaxies.
C) a collision with a large galaxy in the distant past.
D) stars being pulled from the Andromeda Galaxy.
E) spiral density waves.
Question 2
If a white dwarf gains sufficient mass, it can become a:
A) brown dwarf.
B) type II supernova.
C) type I supernova.
D) planetary nebula.
E) black dwarf.
The "Emu in the sky," a constellation defined by dark clouds rather than the stars.
Hertzsprung-Russell diagram for a set of stars that includes the Sun
Milky Bar Snail
The Host Galaxy of a Gamma-Ray Burst
Giant Elliptical Galaxy M87
Gallstones result from the crystallization of salts and other compounds in bile