Astronomers believe that there is a supermassive black hole at the center of the Milky Way Galaxy because:
a. the Chandra X-ray telescope observed an X-ray burst from the center of the Milky Way Galaxy indicating the presence of a supermassive black hole
b. stars and gas are are observed to be in very rapid orbits around Sagittarius A* indicating the presence of a supermassive black hole
c. our solar system is moving at 828,000 km per hour around the center of the Milky Way Galaxy indicating the presence of a supermassive black hole at its center
d. both a. and b. above, but not c.
According to current calculations, the fate of the universe is what?
a. It will expand to a certain point and then collaspe in on itself
b. It will expand to a certain point and then stop
c. It will expand forever
d. none of the above
a system of classifying galaxies according to their appearance into one of four broad catagories is:
a. the galactic Hertzprung-Russell diagram
b. the flocculent spiral system
c. the Hubble classification system
d. none of the above
After the early universe had cooled enough so that atoms could form, virtually all of the matter in the universe consisted of ___________ and ___________.
a. deuterium, tritium
b. oxygen, carbon
c. hydrogen, oxygen
d. hydrogen, helium
More active star formation occurs in _________ galaxies.
a. spiral and barred spiral
b. elliptical
c. dwarf elliptical
d. Doppler shifted
in a ___________ universe, two parallel light beams would eventually converge. Additionally, you could travel in a straight line and eventually end back up at your starting point.
a. closed
b. open
c. infinite
d. negatively curved
a. the Chandra X-ray telescope observed an X-ray burst from the center of the Milky Way Galaxy indicating the presence of a supermassive black hole
b. stars and gas are are observed to be in very rapid orbits around Sagittarius A* indicating the presence of a supermassive black hole
c. our solar system is moving at 828,000 km per hour around the center of the Milky Way Galaxy indicating the presence of a supermassive black hole at its center
d. both a. and b. above, but not c.
According to current calculations, the fate of the universe is what?
a. It will expand to a certain point and then collaspe in on itself
b. It will expand to a certain point and then stop
c. It will expand forever
d. none of the above
a system of classifying galaxies according to their appearance into one of four broad catagories is:
a. the galactic Hertzprung-Russell diagram
b. the flocculent spiral system
c. the Hubble classification system
d. none of the above
After the early universe had cooled enough so that atoms could form, virtually all of the matter in the universe consisted of ___________ and ___________.
a. deuterium, tritium
b. oxygen, carbon
c. hydrogen, oxygen
d. hydrogen, helium
More active star formation occurs in _________ galaxies.
a. spiral and barred spiral
b. elliptical
c. dwarf elliptical
d. Doppler shifted
in a ___________ universe, two parallel light beams would eventually converge. Additionally, you could travel in a straight line and eventually end back up at your starting point.
a. closed
b. open
c. infinite
d. negatively curved