Astronomy | Astrophysics Answers

A white dwarf star has a mass of (10)30 kg and its luminousity is (10)24 (j)/s . Calculate how long it can survive with its present luminosity of its internal temperature is (10)7 k .

A star has surface temperature of 25000k . Which lines will be prominent in its spectrum ? Justify your answer?

The mean distance of mars from the earth is 0.5A.U. and its orbital period is 687 days . Calculate the orbital period of jupitar given that its mean distance the earth is 4A.U.

show the horizon coordinates of a star X on a celestial sphere for a location at lattitude 60 degree N.
would these coordinates be the same at lattitude 30 degree N ?

Express the distances of planet jupiter from the earth and the sun in light years.

If distance between earth and sun is become half and orbital speed remains same, then hom many days in a year become?

Gravitational force is attractive not repulsive then why our whole universe is expanding with some acceleration and accelerating at a faster rate from the time of Big Bang.Which law of physics is working over here?

What is condactor

What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth

a) The comet Encke has an aphelion distance of 6 . 1 × 10^11 m. and perihelion distance of 5.1×10^11 .the mass of the sun is 2×10^30kg. Find the speed of the comet at the perihelion and the aphelion.


b)The planet earth is 1 . 5 × 10 11 m from the sun and orbits the sun in one year. The planet Pluto takes 248 years to orbit the sun. How far is Pluto from the sun?