Universe Size Comparison
(From smallest to biggest)
1) Ceres = 950 km
Information - Ceres is the largest object in the asteroid belt that lies between the orbits of Mars and Jupiter
Its mass is 8.958 * 10^20 kg .
2) Moon = 3,500 km
Information - The Moon is an astronomical body orbiting the Earth and the planet's only natural satellite .
The Moon's gravity is 1.62 m/s^2.
3) Callisto = 4,800 km
Information - Callisto , or Jupiter IV is the second-largest moon of Jupiter after, Ganymede .
Callisto's gravity is 1.236 m/s^2.
4) Mercury = 4,900 km
Information - Mercury is the smallest and the innermost planet of the Solar System.
Mercury's mass is 3.285 * 10^25 kg (0.055 M⊕). 
5) Mars = 6,800 km
Information - Mars is the fourth smallest planet from the Sun and the second-smallest planet in the Solar System .
The gravity on Mars is 3.711 m/s^2 . 
6) Venus = 12,000 km
Information - Venus is the second planet from the Sun .
Venus's distance from the Sun is 108.2 million km . 
7) Earth = 13,000 km
Information - Earth is the third planet from sun and the only known astronomical body to harbor life .
The mass of the Earth is 5.97237×1024 kg. 
8) Kepler 22B = 30,000 km
Information - Kepler 22B is an extrasolar planet orbiting within the habitable zone of the Sun-like star Kepler 22.
The planet's distance from Earth is 587.1 light years . 
9) Neptune = 50,000 km
Information - Neptune is the eighth and the farthest known planet from the Sun in the Solar System .
Neptune's orbital period is 165 years . 
10) Uranus = 51,000 km
Information - Uranus is the seventh planet from the Sun .
Uranus's orbital period is 84 years . 
11) Saturn = 120,000 km
Information - Saturn is the sixth planet from the Sun and second largest planet in the entire Soar System after, Jupiter.
Saturn's distance from the Sun is 1.434 billion km . 
12) Jupiter = 140,000 km
Information - Jupiter is the fifth planet from the Sun and largest planet in the Solar System .
Jupiter's mass is 1.898 * 10^27 kg (317.8 M⊕). 
13) Proxima Centauri = 200,000 km
Information - Proxima Centauri is a small, low mass star located 4.244 light years away from the Sun Proxima Centauri's distance from Earth is 4.244 ± 0.001 ly; (1.3012 ± 0.0003 pc).
14 ) The Sun = 1,400,000 km
Information - Sun is the star at the centre of the solar system .
Sun's surface area is 6.09×1012 km2. 
15) Sirius A = 2,500,000 km
Information - Sirius A is a binary star which is present in the constellation of Canis Major.
Its mass is 3.978 × 10^30 kg (2 M☉). 
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