Astronomy & Space

How do scientists know that black holes exist

Well today at school we watched a video about the universe. One of the things it talked about was black holes, and it explained how when a star dies out all of its gravitational pull comes inward, tra

What if a human was so big that his head were in space

Would he survive? What would happen to earth?-If he had the same proportions as a normal-sized human his bones would crumble under the weight of his body. If you double the height of a body the cross-

How does space expand does stretch or simply grow

E = mc^2 applies to BOTH baryonic (normal) matter and energy AND non-baryonic matter (dark matter) and dark energy. I simply grows, a change in volume. It doesnt stretch - when something stretches it

Who to call upon the possible sighting of a UFO

I am able to see multiple objects in the sky that dont move, are blue & flickering, and are triangularly paired up. As well, two military helicopters flew overhead in the direction of one of the objec

How is space never ending

I dont get it!! It would have to keep making and making more space! Is there a wall or something?? Im interested...-Well, ..., even though the universe is Astronomically large it is finite and not inf

Who decides when and who gets to go into space

NASA has missions that are sent into space all the time. When the plans go into place, who is the one in charge to make that decision? Is it a group of members that makes the decision, the president?

Has anyone noticed the sun setting in the wrong position recently

I thought that it was a little to far north for the time of year, Or am i just imagining it?-How could anyone notice something that isnt happening?Drugs, forgetfulness, or sheer ineptitude, I should g

If the Earth, for some reason, became tidally locked

How hot would it get on the side facing the sun and how cold would it get on the darkside?-Scientists conducted simulations to explore climate dynamics of tidally locked Earth-like exoplanets and to i

Whats happening to the sun

On the news they were talking about how the sun.. i dont know im just so confused. please hlep. thanks-Imagine that the sun is like a big bubbling pot of spaghetti sauce. Once in a while a big bubble

What tools are used in Astronomical Spectroscopy

A telescope, a spectroscope, photomagnifiers.... And, a coffee pot - just to stay awake.

Sundial shadows question...

probably an odd question but.. Im curious Would the shadow of a sundial be shorter or longer during noon (12:00) compared to afternoon (say 3:00- 6:00) Thanks!-Shadows are always shorter at noon bec

How long do tiny black holes exist

If you mean those supposedly created by the large hadron collider, they last for a split second. Not long enough for them to attract another atom to them.-They evaporate in less than a nanosecond. Tha

Why does the moon appear closer on certain parts of the Earth

I know its not ACTUALLY closer, but what makes it appear closer?-It appears so (optical illusion) at certain times. It appears equally big from all parts of globe wherever it appears in a day. You nee

Have you ever thought...

That it would be cool to go to Mars and stand there and have a dust devil pass over you.. (: how cool Tell me one thing that you wish you could do in space like if you could visit a planet without a

Red/white light torch

Where can I buy a red/white light torch (a good one) How much do they cost ?-I made my own a number of years back. I located some transparent red plastic sheets at an art supply store and simply cut