Universe Overview: Explore Galaxies, Stars, and Constellations | Studento
Universe Overview: Explore Galaxies, Stars, and Constellations
Universe
The Universe includes everything from Galactic Mega Clusters to subatomic particles.
The Universe is approximately 13.79 billion years old (as of 2015).
There are around 100 billion galaxies in the visible Universe.
The Big Bang Theory is the most accepted explanation for the origin of the Universe.
Galaxy
A Galaxy is a collection of millions or billions of stars and planets held together by gravitational pull.
The Milky Way is a spiral galaxy that contains Earth and appears as a river of milky light in the sky.
The nearest galaxy to the Milky Way is Andromeda, about 2.5 million light-years from Earth.
Stars
Stars are luminous heavenly bodies made of extremely hot burning gases, emitting their own light and radiant energy.
Star colors indicate temperature: Red (low), Yellow (higher), Blue (very high).
Stars form from clouds of dust and gas (Nebula) which condense into ProtoStars, leading to nuclear fusion and star formation.
After hydrogen is depleted, stars fuse helium into carbon. When fusion stops, the star's core contracts, forming a White Dwarf.
A White Dwarf can cool into a Black Dwarf, becoming a dead star.
Massive stars can become Red Supergiants, eventually exploding as Supernovae or transforming into Neutron Stars or Black Holes.
The Sun is the nearest star to Earth, followed by Proxima and Alpha Centauri (4.35 light-years away).
Constellations
Constellations are groups of stars forming imaginary shapes in the night sky, aiding in navigation.
Examples include Orion, Big Dipper, Great Bear, and Cassiopeia.
Orion is visible in late evenings during winter, Cassiopeia in the Northern Sky during winter, and Great Bear in the early night during summer (Ursa Minor and Ursa Major).
Know atleast a little
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