Basic Astronomy


Mars is the 4th planet from the Sun and the second smallest planet in the Solar System.

Mars is named after the Roman God of war.

Mars is often described as the "Red Planet" due to its reddish appearance. The reddish color comes from the iron oxide on the surface of Mars.

Equatorial diameter
(Earth diameter)
(Earth mass)
Orbital radius
Orbital period
to Sun's
Orbital eccentricityRotation period
No. of
confirmed moons

Moons of Mars

NameImageMass (kg)DiameterSemi-major axisOrbital periodAverage moonrise period
PhobosPhobos10.8×1015(27×21.6×18.8) km9,377 km (5,827 mi)7.66 h11.12 h (0.463 d)
DeimosDeimos2×1015(10×12×16) km23,460 km (14,580 mi)30.35 h131 h (5.44 d)

Related Stories

Curiosity rover of NASA discovered life friendly ancient fresh water lake in Mars

NASA reveals plan to send new mars rover in 2020

Curiosity found evidence of ancient river bed in Mars

Curiosity rover successfully landed on Mars

Mars spacecraft of Russia falls in Pacific ocean

This site is © Copyright Basic Astro 2012-2017, All Rights Reserved.