A type of energy which pulls the universe apart and surrounds most of the universe.

The Big Freeze theory refers to the idea of astrophysicists that the universe's temperature will decrease to 0 degrees Celsius. It is also called the heat death.

Milky Way was created when dust and stars joined together forming swirling clouds which rotated at high speed and shaped our galaxy into a round disc.

Cluster of millions of stars formed long ago due to combining of stars and dust in space is what we call a 'GALAXY'.

The temperature of the universe after the explosion was 5 billion degrees Celsius.

Dark mater is believed to be the one which acts with gravity and pulls the universe to make a reverse Big Bang or the Big Crunch. Dark Matter is the reason why scientists came up with the idea that the universe will contract and once again become into a small, dense and hot ball of gas. It is also possible that the whole process starts again with maybe new life and rewritten laws of physics and chemistry

Scientists have many theories about the universe. They are not even sure if the universe will undergo Big Crunch or Big Freeze. Although after Albert Einstein was proved wrong for his idea of a static universe and when it was discovered that the expansion speed of the universe is accelerating, scientists think that there are high chances for the universe to expand forever and undergo Big Freeze. Otherwise, if there is enough dark matter, then the expansion would completely stop and start contracting and undergo Big Crunch.

Sound does not travel at all in space. The vacuum of outer space has essentially zero air. Because sound is just vibrating air, space has no air to vibrate and therefore no sound.

Galaxies do indeed rotate due to which they have flattened round shape but they look frozen at one place because of their huge size, very high speed and very large distance.

The stars we see are all part of our, Milky Way galaxy but they're so far that they seem to have no movement relative to each other. That is why stars appear fixed relative to each other.

Space is cold because of the less jiggling motion between molecules because of the expansion of universe.

A black hole itself does not give off any light that is why it is called black. However, matter that is near a black hole can give off light in response to the black hole's gravity.

In the current universe, all evidences suggest that the number of electrons in the universe is almost identical to number of protons making the universe electrically neutral i.e. zero charge.

There is no center and edge of the Universe as it is continuously expanding and the expansion is uniform all over the galaxies.