Orbital dynamics show that President Trump’s pledge to land astronauts on Mars couldn’t happen until 2029 at the earliest.

A crescent moon will be part of a planetary parade featuring six planets after sunset on Feb. 3: Mars, Jupiter, Uranus, Venus, Neptune and Saturn.

Following reports that Musk has overstayed his welcome in the president’s inner circle, Trump asks the billionaire to “go get” two stranded astronauts.