Most astronomers believe that the origin of the Universe is the Big Bang Theory.
A light year is the distance travelled by light in one year.
The theory that explains an explosion about 10 to 15 billion years ago which many astronomers believe to be the origin of the universe is called Big Bang Theory.
Galaxies are stellar objects which have immense gravitational attraction.
A light year is equal to 9.46 Trillion kilometers.
A star which appears blue, is hotter than a red star.
The period of one revolution of the sun around the center of the galaxy is called the cosmic year.
Black Hole is a hypothetical region in space.
A black hole is a region in space with an extremely strong gravitational field, where nothing, not even light, can escape.
The universe is expanding, a discovery attributed to Edwin Hubble, an American astronomer.
The exact age of the universe is approximately 13.8 billion years.
The universe comprises space, matter, and energy.
Cosmology is the branch of Astronomy that studies the origin and evolution of the universe.
Black holes are objects with dense gravitational fields.
The branch of Space Science which applies the laws of Physics and Chemistry to understand the Universe is Astrophysics/Astrochemistry.
