Where come from materials and cosmic radiation | Earth, Solar System and Universe.

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In the universe there are scattered materials, inside and outside galaxies. We talked about the interstellar matter, light, background radiation, and dark matter.

Interstellar matter

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The gas and dust between the stars and galaxies is. Most is not visible, but can be detected through its gravitational effects and its electromagnetic emissions.
It consists, mainly, of hydrogen, but there are also small amounts of helium, nitrogen, oxygen, carbon and simple molecules of water, alcohols and ammonia.

Astro-bio-chemistry

An atom of hydrogen and one of oxygen can be combined to form a group o (hidroxilico), very active, capable of joining with almost any material. If you are with a hydrogen atom, form a molecule of water.
More complex molecules, formed by dozens of atoms were located from the 1970s.
Some could, under favourable conditions, forming organic matter, which is the basis of living organisms.

Light, waves or particles?

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Light waves, such as X rays, can not be issued one by one, but only in packets called "how many". The science that studies it is quantum mechanics.
These types of high-frequency radiation, depending on how you look, behave like particles and, at the same time, as waves. The particles of light are photons. They have no mass and travel at about 300,000 km/s.

The cosmic background radiation

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The "tangible" proof of the Big Bang was found in 1965. Checking a very sensitive microwave detector, two scientists discovered a radiation strange derived equally from all points of space.
Other theorists had already predicted that we should observe, coming from all over the universe, a "glow" testimony of the Big Bang, and that this light, due to the expansion of the universe, would be presented in the form of microwave.

Dark matter

It is believed that the dark matter is a material that does not emit any electromagnetic radiation. Its existence is based on theoretical considerations and is, by far, one of the main problems facing the Astrophysics.
Studying the forces in the universe, it is estimated that total matter is much more than the detected by our instruments. As we know nothing of it, it is called dark matter.
Published for educational purposes