Mars



Mars is the 2nd smallest planet in the solar system and is the 4th farthest from the Sun. It is also the 2nd closest from Earth. It has a red surface and a thin atmosphere. It also has a low density than the other terrestrial planets, making it the least dense terrestrial planet. It is around 6000 km in diameter, just a bit bigger than the biggest moon in the solar system, Ganymede.

Exploration
NASA has sent many rovers to mars to explore the surface of it. There are the viking 1 and 2 rovers, the small 1997 sojourner, 2004 opportunity and spirit, 2011 curiosity and 2020 perseverance. Also more rovers phoenix in 2008 and insight in 2018.