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The Milky Way galaxy is approximately 100,000 light-years in diameter.
The Universe is made up of about 100 billion galaxies, including the Milky Way.
The Andromeda galaxy is closer to us than any star in our galaxy.
The Big Bang Theory explains that the Universe began from a single point and expanded.
Redshift occurs when light from distant galaxies shifts towards shorter wavelengths.
The Cosmic Microwave Background Radiation (CMBR) is the afterglow of the Big Bang.
The temperature of the Universe\’s background radiation is about -270°C.
The first detection of CMBR was made by accident.
The Hubble constant H0 is used to determine the age of the Universe.
The current estimate for the Hubble constant H0 is about 2.2×10−18 per second.