How do we know the mass of Neptune?
A) the period and size of Neptune's orbit around the Sun
B) the orbital speed of Neptune moving around the Sun
C) the size and density of Neptune
D) the distance of Neptune from the Earth and its rotation period
E) the periods and sizes of the orbits of the moons around Neptune
E
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What are the outward forces that act on a star? What are the inward forces? How do these compare?
What will be an ideal response?
If we define the gravitational field 
, where 
is a unit radial vector, then Gauss's law for gravity is
A.
.B.
.C.
.D.
.E.
.Which has a greater luminosity, a star with absolute magnitude +4 or a star with absolute magnitude -6? By how much is it brighter?
What will be an ideal response?
When the Moon is totally eclipsed, the Moon is illuminated by some sunlight reflected by Earth's atmosphere
a. True b. False Indicate whether the statement is true or false