Astronomy | Astrophysics Answers

Show the horizon coordinates of a star X on a celestial sphere for a location at
latitude 30° N.

Calculate the ratio of the surface temperatures of the stars A and B from the
following data:
Star Absolute magnitude Radius (RQ)
A 2 62
B 6 4

The distance of planet Jupiter from the Sun is 5 AU. Express this distance in light
year and parsec.

Is it possible for a tidally locked planet to have a moon?

If fire needs oxygen then how sun is burning in space? As there is no oxygen in space.

if the years on planet x are 1000 days.
and each 1 day on planet x is equal to 3 earth days.
and if HALF of the year the whole planet is in NIGHT.
and the other half of the year is DAY.

and if there are 2 moons one bigger than the other.

how long would the orbit be?
how long would a month be?

I'm open for any suggestions if any part of the question needs to be changed.
and keep in mind that :
there are supposed to be 2 moons, and one is bigger.
And then the whole planet has 500 continuous nights and then 500 continuous days.

And while we are on the subject:
Is it possible for there to be a kind of solar event and ONCE in a while somewhere around the 500 continuous nights there could be sunrise for a while ? Just like eclipses on earth.

When a vehicle is passing through the atmosphere, at some point it may decelerate at a rate of 39.2m/s^2 (away from the center of Earth) while Earth's gravitational pull remains at -9.80m/s^2.
a)In such a situation, what is the apparent weight in gs of an astronaut inside the vehicle?
b)In this situation, is the astronaut in a microgravity situation?

how many number of sun family in a universe?

is the sun has a surface ?