Stars, Blackholes, and galaxies

• Stars are self-luminating celstial bodies that shine by radiation
• Stars around the same size as the Sun

  nebula-protostar-main sequence star-red giant-white dwarf-black dwarf
• Stars larger than the Sun

  nebula-protostar-main sequence star-red supergiant-supernova-blackhole or neutron star
• Brightest stellar classes in decreasing order

  Dark blue (O)

  Blue (B)

  Light blue (A)

  White (F)

  Yellow (G)

  Orange (K)

  Red (M)
• Oh Be A Fine Guy, Kiss Me
• Blackholes have such strong gravitational pull not even light can escape
• Blackholes

  Stellar-mass - formed from stars with 20+ solar mass

  Supermassive - formed from stars with millions to billions of solar mass
• Supermassive black holes are found at the centre of most galaxies
• A collection of gas, dust, celestial bodies, and solar systems is called a galaxy
• Andromeda is our galaxy's (Milky Way) closest neighbour