Astronomy | Astrophysics Answers

The crab is defined as the intensity of x-rays emitted from the Crab Nebula at a given photon energy up to 30 kiloelectronvolts (keV). One crab is approximately 24 pW/m^2. What surface area in ft^2 would show the intensity of X-rays in 1 second?

If parallax of a star is 0.1 and three times luminosity than sun, find apparent magnitude

A pilot who is 60km above from sea level watches sun rise at 0546h .At what time observer in below the plane can watch the sun rise?

Build up an equation for increasing wave length when mass of a star is M and radius is R .

An energy of 5.35eV is stored by a molecule undergoing circulatory motion with an angular momentum of 0.5kgm^2s-1, determine its moment of inertia.

An energy of 5.35eV is stored by a molecule undergoing circulatory motion with an angular momentum of 0.5kgm^2s-1, determine its moment of inertia.

an energy of 5.35eV is stored by a molecule undergoing circulatory motion with an angular momentum of 0.5kgm^2s-1, determine its moment of inertia

What is keplers 3rd law

In science it is often useful to estimate if a measurement is in the right ballpark by comparing it to a value you already know. Given that our Sun is about 8.5 kpc from the center of the Galaxy and about 2/3 of the way from the center to the edge of the Galaxy, which of the following is the best estimate of the radius of the Milky Way Galaxy?

If the moon has 1.2 percent of the earth's mass and gravity is proportional to mass, then why is the moon's gravity 16.6 percent of earth's gravity?