Astrology - Important Numbers

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Last updated 3:34 PM on 9/17/26
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13 Terms

1
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Speed of Light

300 000 km/h

2
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Earth’s Radius

R = 6400 km

3
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Solar Radius

R = 700 000 km

4
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Astronomical Unit

1 AU = 1.5 × 10^8 km

5
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Light Year

1 ly = 10^13 km

6
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Age of the Universe

13.8 billion years

7
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Distance to the Nearest Star

Proxima Centauri: 4 light years

8
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Diameter of the Milky Way

100 000 light years

9
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Distance from the Sun and Neptune

30 AU

10
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Number of Stars in the Milky Way

100 billion

11
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Number of Galaxies in the Observable Universe

100 billion

12
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Age of the Milky Way

12 billion years

13
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Age of the Earth

4.5 billion years