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Astronomy | Astrophysics
The estimated life time of the sun on mainsequence is ~10^10 yrs. Determine the mainsequence life time of a star of 0.5 Mo.
Astronomy | Astrophysics
Explain the origin of 21 cm radiation.
Astronomy | Astrophysics
Explain why sunspots appear dark ?
Astronomy | Astrophysics
In the H-R diagram, three stars are found to be having luminosities L1, L2 and L3 such that
L1 > L2 > L3. Determine the ordering relation of their radii if the effective temperatures of these stars are the same.
L1 > L2 > L3. Determine the ordering relation of their radii if the effective temperatures of these stars are the same.
Astronomy | Astrophysics
Compute the magnitude of the faintest object observed with a 1 m optical telescope.
Astronomy | Astrophysics
The apparent magnitudes of two stars are 0.06 and 1.06 respectively. Calculate the ratio of their brightness.
Astronomy | Astrophysics
Express the radius of the Earth in unit of solar radius. (Radius of the earth is 6.4 x 10^6m).
Astronomy | Astrophysics
Explain why at one time, the steady state theory appeared necessary. What is its status now?
Astronomy | Astrophysics
What part of the Milky Way allows for determination of its rotational direction?
A. Galactic disk
B. Celestial body
C. Two long tails
D. Galactic body
A. Galactic disk
B. Celestial body
C. Two long tails
D. Galactic body
Astronomy | Astrophysics
The average energy of particles in the early phase of the universe, when it was very
hot, was approximately 10 GeV. Calculate the corresponding temperature.
hot, was approximately 10 GeV. Calculate the corresponding temperature.
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#339914 on Dec 2023
#339914 on Dec 2023