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The age of the universe is 13.8 billion years, and the diameter is about 93 billion light-years
The Pisces-Cetus Supercluster complex is 1 billion light-years long and 150 million light-years wide.
The Laniakea super galaxy has a diameter of 520 million light-years and contains 100,000 galaxies.
The Virgo Supercluster is 100 million light-years in diameter and contains 47,000 galaxies.
The Local Group of Galaxies is 10 million light-years in diameter and contains 50 galaxies
The Andromeda Galaxy is 220,000 light-years in diameter and has 1 trillion stars.
The Milky Way is 180,000 light-years in diameter and has 400 billion stars.
What is the concept of light year
Commonly used units in astronomy are parsecs, astronomical units and light seconds
An astronomical unit is 149,597,870,700 meters
A light second is the distance traveled by light in one second and is 299,792,458 meters.
A light-year is 9,460,528,177,426.821 meters.
One parsec equals 3.26 light years
The speed of the earth' s movement around the sun is 29.79 kilometers per second,
The speed of the sun in the Milky Way is 240 kilometers per second,
The speed of the Milky Way in the universe is 600 kilometers per second,
The Juno space probe has a top speed of 265,000 kilometers per hour,
It would take about 4075 Earth years to travel a distance of 1 light-year with Juno,
If Juno were to fly to the closest habitable planet to Earth,
It takes 17115 Earth years to reach Proxima b, 4.2 light-years away,
It takes 48512 Earth years to reach Tiancang 5e, which is 11.905 light-years away,
It takes 56,235 Earth years to reach Wolf 1061c, which is 13.8 light-years away,
It takes 65199 Earth years to reach Gris 832c, which is 16 light years away,
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