Must See

1. Universe
Amogh and Ankit

2. What are universes ??
 all existing matter and space considered as a whole; the cosmos. The universe
is believed to be at least 10 billion light years in diameter and contains a vast
number of galaxies; it has been expanding since its creation in the Big Bang
about 13 billion years ago.

The Universe is all of time and space and its contents.[9][10][11][12] It
includes planets, moons, minor planets, stars, galaxies, the contents of
intergalactic space, and all matter and energy. The size of the entire Universe
is unknown.

3. What are there in universe
 According to the best estimates of astronomers there are at least one
hundred billion galaxies in the observable universe. They've counted the
galaxies in a particular region, and multiplied this up to estimate the number
for the whole universe.
 While estimates among different experts vary, an acceptable range is
between 100 billion and 200 billion galaxies, Mario Livio, an astrophysicist at
the Space Telescope Science Institute in Baltimore, told Space.com.

4. How old is the universe
 The universe is about 13.8 billion years old, so any light we see has to have
been travelling for 13.8 billion years or less – we call this the 'observable
universe'. However, the distance to the edge of the observable universe
is about 46 billion light years because the universe is expanding all of the
time.

5. How was the universe was formed
 Most astronomers think that the Universe was formed during an event called
the Big Bang - a giant explosion which occurred between 10 and 20 billion
years ago. During the Big Bang, all of the space, time, matter, and energy in
the Universe was created. This giant explosion hurled matter in all directions
and caused space itself to expand. As the Universe cooled, the material in it
combined to form galaxies, stars, and planets.