Astronomy | Astrophysics Answers

Do we know of any stars that appear near Alnitak that are about 5,000 light years away? Any near the size of our sun?
Thanks very much.

Let us consider our solar system only and our Earth and other planets are in their orbits as usual, and it takes around 8 minutes for light to reach the Earth from the sun. Now, let us assume, sun has vanished from this moment, and naturally this event will reach our earth after 8 minutes at the velocity of light. So, during that 8 minutes, our earth will be in its orbit undisturbed, is that true?( assuming nothing moves faster than the light). In that situation, having nothing at the center of the solar system, and earth remains in its orbit perfectly during that 8 minutes, how the basic Physics will hold during that 8 minutes. Any explanation?

Suppose that the nuclear reactions at the centre of the Sun could be suddenly turned off, what would be the immediate effect at the solar photosphere?

a satellite geosat is in a circular geostationary orbit of radius rg,above a point p on a equator. another satellite comsat is in alower circular orbit of radius 0.81rg. at 7 p.mon january 1, comsat is sighted directly above p.on which day among the following can comsat be sighted above p between 7 p.m and 8 p.m?

The total luminosity at all wavelengths of the magnetar burst observed on December 27, 2006, was approximately 10^14L. At what distance from the magnetar would the brightness of the burst have been equal to the brightness of the Sun as seen on Earth?

Hi..I have always been a huge fan of Star Trek TNG. I have always wondered why (when there in space) they couldn't go around a ship or over it or under it? They always have to stand and fight or turn around. Why not the options to go over or under? Sorry if this sounds stupid but I just don't get it. I just assume there must be a real reason since they did try to stick to real world answers most of the time.

What is the generally accepted explanation for the times of the year where day and night are the same length? Explain an example of how the diameter of the Sun may modify this explanation slightly.

How do the local solar time and local standard time charts differ?
Does local solar noon
always match local standard time noon? Why or why not?