Astrophysics

Question 1

1. Roughly how many galaxies in a universe?
2. Roughly how many stars in a galaxy
3. What is our solar system’s name?

Answer 1

1. There are roughly a billion galaxies in the universe
2. There are roughly a billion of stars in a galaxy
3. Our solar system is called the Milky Way

Question 2

What is the difference in the orbit of a comet, moon and planet?

Answer 2

A moon orbits in an eliptical orbit
A planet orbits in a circle
A comet orbits in an eliptical orbit

Question 3

What is the calculation to find orbital speed?

Answer 3

Orbital speed = (2 X π X Orbital Radius) / Time Period

V = 2 X π X R / T