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Tuesday, 24 April 2018

Universe



Cosmology- The study of the birth & the expansion of Universe.
Big bang theory tells the big bang occurred 1370 crore years before.
Edwin Hubble proved that the Universe is expanding(1929).
Quasars- the Most distant objects in the Universe.
The mother galaxy of Earth- Milky Way.
Milky Way is estimated to have more than 2000 crore Suns.
Stars born at the regions called Nebula. It consists of dust & gases.
Constellations or Routine star groups help to find directions at night. They're seen in certain shapes. Constellations are named by International Astronomical Union. There're 88 constellations. The largest is Hydra & the smallest is Krux.
2nd largest star visible from Earth- Sirius.
Sirius is the biggest star in our galaxy.
Largest satellite in Galaxy- Ganimeid.
Densest satellite in galaxy- Ayo.
The most abundant element in Universe is Hydrogen. The 2nd most is Helium.
Johannes Kepler- the lawman of space.

The term Panspermia is associated with life on outer space. The Panspermia hypothesis states that the seeds of life exists all over the Universe & can be propagated through space from one location to another.
Most Influential proponents of Panspermia are Fred Hoyle (British astronomer) & Chandra Wikramsinghe (Sri Lankan astrobiologist).

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