By Kenneth Chang and Daniel Victor
In an essay published Tuesday on CNN’s website, President Obama renewed his call for American astronauts to visit Mars.
“We have set a clear goal vital to the next chapter of America’s story in space: sending humans to Mars by the 2030s and returning them safely to Earth, with the ultimate ambition to one day remain there for an extended time,” he wrote.
The plan is not new: The president laid out the same goal in 2010 during a speech at NASA’s Kennedy Space Center in Florida.
Continue reading by clicking the name of the source below.