This
story was updated at 4:13 p.m. EDT.
It has been
four decades since people from Earth first landed on the moon, but it has also
been nearly that long since humans stopped going.
In the three years that followed NASA's historic July 20,
1969 moon landing by Apollo 11 astronauts Neil Armstrong and Buzz Aldrin, five
more missions successfully
touched down on the lunar surface. In all, 12 men walked on the moon during
those flights, the last of them in 1972 during Apollo 17. Today, NASA is on a
path to return to the moon by 2020, but some believe the goal of human
spaceflight should reach much farther - especially in the 40 years to come.
Among them
is Aldrin, who believes that humanity can surpass
the moon and reach the next stepping stone - Mars - by 2031, before the
next four decades are up, but only through an international effort by many
countries.
An
international endeavor
The moon,
Aldrin said, can be a
springboard for places beyond and a robust space presence in low Earth
orbit. By working together to form an international base on the moon,
individual spacefaring nations like the United States can free up more time for
other projects like exploring asteroids, comets, the moons of Mars, and then
the red planet itself.
"It's
leading toward global space leadership," Aldrin said of an international push
to the moon, Mars and orbital stations. "It promotes change and enlightened
cooperation."
That
cooperation will be key, especially in 40 years when the amount of spacecraft
and junk orbiting Earth will have most assuredly increased along with the
number of humans and countries in space, Aldrin explained.
"We can
disagree about human relations, piracy and secrecy, or land grabs below 100
kilometers," Aldrin told SPACE.com. "But up above, it's a different
story. I think we can really challenge our diplomacy and our relations with the
rest of the world in that region."
Private
enterprise in space
Peter
Diamandis, whose company Zero Gravity, Corp., offers weightless joyrides aboard
a modified jet, believes that the nature of
spaceflight could change in the upcoming decades, but only through true
innovation.
"First
of all, I think that we need to be looking at trying to change how spaceflight
is implemented, because today I think it's ridiculous that spaceflight is as
expensive or more expensive than it was 40 years ago," said Diamandis, who
founded the X Prize Foundation that is offering a $30 million Google Lunar X
Prize to the first privately funded team to put a rover on the moon. "We're not
trying new approaches. We're using effectively the same technology. Where is
true, really risky breakthrough work being done? I don't see it happening at
NASA and I don't see it being tested.
"So I'd
love to see some true research and development in propulsion taking
place," Diamandis said. "I'd love to see private companies supported
to the maximum extent possible, for example, the COTS D program [a NASA
program that can encourage commercial development
of manned spacecraft for station flights ], where for me I think it's a
no-brainer. For the cost, it is probably the most logical and most prudent move
that NASA could make to have a backup to programs which may ultimately not work
or may ultimately get cancelled. Why not?
"I think
that we need to create real markets," he said. "We do live in a
capitalist society, we have a free economy, and NASA should be practicing
capitalism and market economics to the maximum extent possible and leading the
way."
Pushing
beyond Mars
For planetary
scientist Alan Stern, a former NASA associate administrator for science,
the year 2049 should bring routine commercial space travel, manned missions to
near-Earth asteroids and even Mars. By then, astronauts should be marking the
Apollo 11 moon landing anniversary from inside their own lunar research
outposts, Stern said.
But bases
on Mars can be the precursor to grander flights since the technology required
for the endeavor can be reapplied to asteroids or more remote targets, he said.
"There
aren't serious technical barriers to go to Mars. That's not to say it's not
hard, but we're already pioneering long duration human spaceflight with the
space station, which has now been inhabited for the better part of 10 years,
which is much longer than a Mars journey," Stern told SPACE.com.
"We're understanding what the logistical and repair needs are. We've had people
in space a year at a time, and then when they land, they're out walking around
the streets a day or two later. They're not feeling entirely back 100 percent
for a long time, for weeks, but that shows you can send people on a year-long
journey to Mars. And if there are any health concerns, you can always the
spacecraft if you have the money to do it and create artificial gravity.
"Radiation
is a hazard, but you can, if you have the financial wherewithal, build a
shelter inside the spacecraft for the occasional bad day event where you have
to hide out," Stern said. "So all these things are tractable if someone
wanted to cut the check, and invest, as a private investor, to send us to Mars
on a 10-year program, it's entirely within our technology today. Entirely."
Permanent
Martian settlement
Cornell
University astronomer Steve Squyres is already
on Mars, at least robotically via NASA's Spirit and Opportunity rovers,
which he has been overseeing as principal rover scientist. But the next 40
years, he said, carry the promise of a permanent human settlement on a
completely different planet.
"Where I
hope and think we'll be is that we will have gone back to the moon in order to
prove out the technologies and techniques that we need to venture further out
in the solar system," Squyres said in an interview. "We will have conducted the
first human missions to near-Earth asteroids, and we'll be in the process of
using the first permanent, scientific base on
the surface of Mars. That's what I'd like to see and expect to see."
That is not
to say that there are hurdles. Squyres said there is still a barrier of will
that humanity must overcome before reaching the red planet in person.
"There are
new launch vehicles that have to be created and built and tested," he said."
There are new spacecraft that have to be designed, but there are no technical
miracles standing in our way. All we've got to do is decide we want to do
it."
Good
citizens of the galaxy
Writer-producer
Ann Druyan, widow of the famed astronomer Carl Sagan, may be in a minority
among those pressing for humanity's expansion out into the cosmos. The people
of Earth, Druyan
believes, may need the next four decades to mature before setting up shop
on other worlds.
"Well, I'm
not a big fan of human colonization," Druyan told SPACE.com. "Just in
terms of the kinds of horrendous crimes that we've committed in the past. And
so part of me feels that before we start actually moving into some of these
other worlds, we should be working on our citizenship skills. And our ability
to feed each other, and some of the other things we have to figure out how to
do on this planet.
"But I
would love an exploratory mission to Titan, which to me has one of the most
alluring planetary surfaces that I've yet to see," she said. "Of
course there will be all kinds of revelations coming from Kepler, and us being
able to get up to speed on visiting some of these other worlds is a big thing
I'd love to happen.
"We do not
know definitively what the case is on Mars. Really, what the situation is.
There's been tantalizing evidence here and there, and I think that certainly
bears much further investigation as soon as possible," Druyan said.
"These
missions are the things that people like to say, well what about hunger? I just
don't see them as necessarily being antithetical to each other," she said.
"In fact I think they feed us in different ways. But also, the money necessary
to do this kind of exploration, when compared with the defense budget, is
really not even a significant fraction. So I think getting our house in order
has to go hand in hand with a much more exciting and vigorous program of
exploration."
SPACE.com
Senior Editor Tariq Malik, Senior Writer Andrea Thompson and Staff Writer Clara
Moskowitz contributed to this report from New York City. This story was updated
to reflect the correct date of the Apollo 11 moon landing.
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