Astronomy | Astrophysics Answers

What is the evidence given in support of an evolving universe?

What happens and why:
When limb mesoderm is grafted under the ectoderm in any region of an early embryo of chick?

If the temperature of the background radiation today is 3k, at what time after the birth of the universe was the temperature 1000000000000000k. Take the age of the universe as 15×1000000000 years.

show the horizontal coordinate of a star X on a celestial sphere for a location at latitude 60° N. would these coordinates be the same at latitude 30° N

why x-ray telesscope kept beyond the earth;s atmosphere? which telescope optical or x-ray would have higher resolving power for the same aperture?

Calculate the magnitude of the faintest object that a 100m optical telescope can detect?

A space traveler weighs 540.0 N on earth. Calculate what the travelers will weigh on another planet whose radius is four that of the earth and whose mass is five times that of earth ?

Assume that the moon is at a distance of 300,000 kms from the earth and that it takes 28 days for
it to orbit the earth once. Geostationary satellites are those which are at a rest relative to earth.
Using these two statements derive the altitude of the geostationary satellite from the centre of the
earth.

comet has an aphelion distance of 6 .1 ×10¹¹ m and periphelion distance of 5.1× 10¹¹m. The mass of the sun is 2.0 ×10^30 calculate the speed of the comet at the perihelion and the aphelion.

Two planets A and B have radii R and R/n^2 respectively what is the ratio of the time periods of their revolution