Astronomical unit
Astronomical unit
Mean distance between Earth and the Sun.
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Readers' pathsAug 2026 – Oct 2026
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Parsec
Unit of length in astronomy.
29%
Apsis
Either of two extreme points in a celestial object's orbit.
12%
Light-year
Distance that light travels in one year.
5%
Solar System
Planetary system consisting of the Sun and objects orbiting it.
3.1%
Earth's orbit
Trajectory of Earth around the Sun.
2.1%
Unit of length
Reference value of length.
1.9%
Orders of magnitude (length)
Comparison of a wide range of lengths.
1.6%
Oort cloud
Distant planetesimals in the Solar System.
1.5%
Sedna (dwarf planet)
Distant body in the outer Solar System.
1.4%
Metre
SI unit of length.
1.2%
Readers come from
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Parsec
Unit of length in astronomy.
11%
Sun
Star at the centre of the Solar System.
10%
Voyager 1
NASA space probe launched in 1977.
4.9%
Jupiter
Fifth planet from the Sun.
3.7%
Oort cloud
Distant planetesimals in the Solar System.
3.4%
Kuiper belt
Area of the Solar System beyond the planets, comprising small bodies.
3.2%
Light-year
Distance that light travels in one year.
3.1%
Planet Nine
Hypothetical Solar System planet.
2.6%
Saturn
Sixth planet from the Sun.
2.5%
Speed of light
Speed of electromagnetic waves.
2.5%