Chemical propulsion is ...

Chemical propulsion is obsolete to go anywhere other than the moon. Three days - that's acceptable. But for Mars, we need propulsion technologies to get us there in, say, 60 days - then spend whatever length of time we want to spend and return when we want to come home.
 See image
 Gene Cernan

Quotes from the same author

OK, let's get this mother out of here.
 See image
 Gene Cernan
The mass gross absence of sound in space is more than just silence.
 See image
 Gene Cernan
I know the stars are my home. I learned about them, needed them for survival in terms of navigation. I know where I am when I look up at the sky. I know where I am when I look up at the Moon; it's not just some abstract romantic idea, it's something very real to me. See, I've expanded my home.
 See image
 Gene Cernan
Today, we are on a path of decay. We are seeing the book close on five decades of accomplishment as the leader in human space exploration.
 See image
 Gene Cernan
Once I finally stepped on the moon, no matter what was to come of the next three days - or the rest of my life - nobody could take those steps from me. People ask how long will they be there, and I say forever, however long forever is, like my daughter’s initials that I scribbled in the sand [TDC for Tracy Dawn Cernan].
 See image
 Gene Cernan