Mars

Mars the fourth planet from the Sun. The planet is named after Mars, the Roman god of war. Mars is also known as the "Red Planet" due to its reddish appearance when seen from Earth.

Mars has two moons, Phobos and Deimos, which are small and oddly shaped. These may be captured asteroids similar to 5261 Eureka, a Mars Trojan asteroid. Mars can be seen from Earth with the naked eye. Its apparent magnitude reaches −2.9, a brightness surpassed only by Venus, the Moon, and the Sun. For much of the year, Jupiter may appear brighter to the naked eye than Mars.

Mars in Crosstime Traffic
While the home timeline had deemed Mars of limited value, several alternates had extensive Martian programs, with at least one actively terraforming the planet.

Mars in Curious Notions
Germany had sent a probe to Mars, and determined it lifeless, and so not worth sending a manned mission to.

Mars in In the Presence of Mine Enemies
The Greater German Reich had visited Mars in the early years of the 21st century. By 2010, manned shuttle missions were regular events.

Mars in The Disunited States of America
Mars had been visited by Prussia and California.

Mars in "The Star and the Rockets"
Joe Bauman was initially afraid the three aliens he met at his Texaco station were from Mars. Reading his mind, the lead alien assured him they were from some place much further away from Mars.

Mars in A World of Difference
See: Minerva.

Mars in Worldwar
Mars (or Tosev 4) had been visited by spacecraft from both the United States and the Greater German Reich. The Race couldn't understand why it was so important to the Big Uglies, as they deemed Mars to be a "useless" planet. In 1964, an asteroid impact occurred which was later revealed to be an American test of the use of asteroids as weapons.

Mars in "Before the Beginning"
The time-viewer revealed that Mars did support microscopic life three and a half billion years ago, a fact which impressed few.