The summer solstice in the southern hemisphere occurs on orabout
Group of answer choices
June 21
March 21
September 21
July 4
December 21
n the H-R diagram, the vertical and horizontal axes arerespectively
Group of answer choices
luminosity and temperature
luminosity and mass
color and brightness
spectral type and apparent magnitude
An asteroid is located between Mars and Jupiter. The semi-majoraxis of the asteroid’s orbit around the Sun is 3 AU. The period ofthe asteroid’s orbit is about ___________ years.
Group of answer choices
5.8
One of the most difficult problems for ancient astronomers toexplain was the Â
Group of answer choices
retrograde motion of the planets
eclipses of the Sun
annual motion of the Sun
phases of the Moon
cause of the seasons
One of the most difficult problems for ancient astronomers toexplain was the Â
Group of answer choices
retrograde motion of the planets
eclipses of the Sun
annual motion of the Sun
phases of the Moon
cause of the seasons
Which of the following is the first discovered Black Hole?
Group of answer choices
NGC 1921
Cygnus X-1
M 31
LGM
The force which was the first to split off from the “motherâ€force after the Big Bang is
Group of answer choices
the Weak Nuclear force
the EM force
the Strong Nuclear force
the force of Gravity
The period of time when the universe experienced a rapidinflation was when?
Group of answer choices
1-3 seconds
10^-35 --> 10^-32 sec
1-3 minutes
10^-43 --> 10^-35 sec
A large galaxy contains mostly old (Pop 2) stars spread smoothlythroughout its volume, but it has little dust or gas. What type ofgalaxy is it most likely to be?
Group of answer choices
Elliptical
Spiral
Irregular
Barred Spiral
7.8
5.2
12.6
3.3
Which of the following statements about the Earth isincorrect?
Group of answer choices
its crust is divided into huge plates that jostle each other ina phenomenon called plate tectonics
it has an iron core
it has an average density of 4 gram per centimeter cubed
its atmosphere consists primarily of nitrogen and oxygen
