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THE BIG BANG THEORY Before the Big Bang, there was no time or space. The Big Bang marked the beginning of the universe's expansion from a single point that was infinitely small, infinitely hot, and infinitely dense. The Big Bang theory happened about 13.7 million years ago. It was the first thing that ever happened the universe.

EXPANDING UNIVERSE During this period, the universe doubled in size at least 90 times, going from subatomic-sized to golf-ball sized almost instantaneously. Once scientists understood that the universe was expanding, they immediately realized that it would have been smaller in the past. At some point in the past, the entire universe would have been a single point. This point, later called the big bang, was the beginning of the universe as we understand it today.

CELESTIAL BODY Celestial body is any natural body outside of the Earth’s atmosphere. Some examples are the sun the moon and other planets in our solar system. Any asteroid in space is a celestial body Any asteroid in space is a celestial body Diagram of a Celestial body

RADIATION Radiation in space takes the form of subatomic particles from the sun and the Milky Way. They can tear through DNA molecules and damage or split them. The damaged DNA can lead to cancers or other diseases. Cosmic background radiation is a black body with temperature slightly less than 3 degrees (about 2.76 K), which peaks in the microwave portion of the spectrum.

COBE The purpose of the Cosmic Background Explorer (COBE) mission was to take precise measurements of the diffuse radiation between 1 micrometer and 1 cm over the whole celestial sphere.

WMAP The Wilkinson Microwave Anisotropy Probe (WMAP) is a NASA Explorer mission that launched June 2001 to make fundamental measurements of cosmology -- the study of the properties of our universe as a whole

SPECTROSCOPE Spectroscope helps us find out what stars are made of. It separates, white light from a star into a very wide spectrum of colours.

COSMOLOGICAL RED SHIFT For very distant galaxies, the effects of curved space causes the wavelengths of light to be increasingly red-shifted as the distance to Earth increases. This is a Doppler-like effect, but it has nothing to do with the speed of the galaxy. Red shift analysis is when describing how far away a distant object is.

ELECTROMAGNETIC The electromagnetic spectrum describes all the wavelengths of light. From dark nebulae to exploding stars, it reveals an otherwise invisible universe. Electromagnetic waves. They are waves they travel through the vacuum of space.

ASTRONOMERS Astronomers are making new things like sensor technology so they can produce systems with intelligent responses, such as diagnosis, prognosis, and learning.

EDWIN HUBBLE Edwin Powell Hubble was an American astronomer who had one of the most important observational cosmologists of the 20th century. The Hubble space telescope (HST) was his idea and he proposed. The science Policies group (SPG) was responsible for the hole thing.

THE FORMATION OF GALAXIES High-velocity clouds of neutral hydrogen are raining down on the galaxy, and presumably have been from the beginning this would be the necessary source of a gas disk from which the disk stars formed.