5. Most distant galaxy:
In 2004, astronomers at the European Southern Observatory, Chile, announced the discovery of Galaxy Abell 135 IR 1916. It exists an astonishing 13.2 billion light years from Earth.
4. Remotest visible object:
The most distant thing in the Universe that can be seen with the naked eyes is the Andromeda Galaxy, which is 2,309,000 light years from Earth. This Galaxy has 300 billion stars and a diameter of 180,000 light years. The light we see now from Andromeda left there just after the first humans appeared on Earth.
3. Nearest Galaxy:
The Sagittarius Dwarf, discovered in 1994, is more than 70,000 light years (660 quadrillion km) from Earth, and is being torn apart.
2. Largest Galaxy:
The central Galaxy of the Abell2029 Galaxy cluster was discovered in 1990. It is 1.070 million light year distant and has a diameter of 5.6 nillion light years, 80 times the diameter of our own Galaxy. It has a total light output equivalent to 2 trillion times that of the Sun.
1. The Milky Way:
The best known Galaxy is the Milky Way. The word Galaxy itself comes from the Greek word for milk. This is because before telescopes were powerful enough to prove that they were made up of individual stars, Galaxies looked like milky or cloudy areas in the sky. Our relatively small Solar System is only one of 100 – 200 billion stars in the Milky Way Galaxy, which is 100,000 light years in diameter. The Sun and all the planets take about 200,000,000 years to complete one orbit around its center.
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