Astronomy | Astrophysics Answers

Has anyone done experiments in space, releasing hydrogen and helium, to see if they tend to stay together or disperse? If so, where can one find the original data? (This would seem rather important to help prove or disprove the current mainstream theories as to the original formation of large bodies in space.)

What concepts would you use to describe the asteroids motion?

When the Hubble DST gazed into an area void of galaxies and found more galaxies at greater distances estimated to be 13.2 billion light years away, shouldn't those galaxies be in a tight group in one location as they must have been when their light departed their locations 13.2 billion years ago?

If the Universe is expanding wasn't it much smaller that many years ago? Or to put it differently, how far away are they now? Would doppler apply if all of the energy and matter in the universe is shrinking while the physical distances (not the relative distances) remain constant?

This seems like a conundrum to me. Can you help me understand?

is it possible that matter and energy taken in from black holes over the age of the universe are
now the dark matter and dark energy that is driving the expansion of the universe? assuming
that all matter and energy in the universe never really leaves the universe.
stupid question i know, but i had to ask!

How does the speed of light depend on its amplitude and wavelength?
A.The smaller the amplitude and the longer the wavelength, the larger the speed
B.The larger the amplitude and the shorter the wavelength, the larger the speed
C.The larger the amplitude and the longer the wavelength, the larger the speed
D.None of the above

Is there any force in space

How come the size of the universe is 90 billion light years across yet the age of the universe is 14 billion years, surely the universe could only be 28 billion light years in diamiter?

if two stars have the same proper motion, but a parallax measurement indicates star A is twice as far away as star B, what can be concluded about the tangential velocity of star A compared to star B. Explain.

Hello,

It's well-known that the distance between the Earth and the Moon increases by approximately 3.8 cm/year. I wonder how much longer time it takes for the Moon to orbit the Earth due to this change? It seems to be very difficult to find this value on the web, therefore I would be very thankful if you can help me.

Best regards,
Oscar Carlsson