Astronomy/Astrophysics/Cosmology Practice Questions
Our Sun will end its life by becoming
a white dwarf
......... have the most energetic photons
gamma rays
A massive star undergoes spectacular explosion during its evolution because
its iron core becomes unstable
A neutron star is
left behind after a supernova explosion.
The cosmic microwave background radiation is
leftover radiation from the original Big Bang that has since had its wavelength tremendously redshifted by the expansion of the universe.
Among protons, electrons, neutrons and neutrinos, the most massive are
protons
......... have the longest wavelength
radio waves
The dominant force acting between protons and neutrons in an iron atom is
strong force
The cosmic background radiation is
the electromagnetic remnants of the Big Bang
Light Year is the unit of
Distance
Approximately, there are ....... number of galaxies in our Universe.
200 Billion
The distance from the center of our Galaxy to the Sun is
25,000 ly
What is the first exoplanet planet discovered around a Solar type star?
51 Pegasi b
Which is closest galaxy to the Milky Way Galaxy?
Andromeda
At what time in the history of the Universe were all four fundamental forces of Nature unified?
During the Big Bang and shortly after.
How spacetime warps as a single entity is the finding of....
General Theory of Relativity
As predicted by the General theory of Relativity, which of the waves were recently detected by observation?
Gravitational waves
The force that was first to split from the others was
Gravity
The interstellar medium constitutes the highest composition of
Hydrogen
What are the three fundamental results of Special Theory of Relativity
Length contraction, Time dilation, Mass increment
What significant event occurred at about 300,000 years after the Big Bang?
Matter and radiation separated.
The Nearest star from Earth is
Proxima Centauri
The main components of the thin disk of our Galaxy are:
central bulge, central black hole and spiral arms.
The weak force is responsible for
certain radioactive decays such as the decay of a neutron into a proton, electron and antineutrino
The dimensions of the thin disk of our Galaxy are:
diameter 100,000 ly and thickness 2,000 ly.
Positron is the anti-particle of
electron
The strong force is responsible for
holding protons and neutrons together inside nuclei.
In cosmology, the inflationary epoch is called
the time when the Universe expanded very rapidly
