APR 09, 2015 8:50 AM PDT

We are on the verge of discovering aliens, says NASA's chief scientist

WRITTEN BY: Robert Woodard
Recent observations by planetary probes and telescopes on the ground and in space have shown that water is common throughout our solar system and the broader Milky Way galaxy.NASA chief scientist Ellen Stofan said Tuesday that, within a decade, humanity will have found 'strong indications' of extraterrestrial life.

Humanity is on the verge of discovering alien life, high-ranking NASA scientists say.

"I think we're going to have strong indications of life beyond Earth within a decade, and I think we're going to have definitive evidence within 20 to 30 years," NASA chief scientist Ellen Stofan said Tuesday (April 7) during a panel discussion that focused on the space agency's efforts to search for habitable worlds and alien life.

"We know where to look. We know how to look," Stofan added during the event, which was webcast live. "In most cases we have the technology, and we're on a path to implementing it. And so I think we're definitely on the road."

Former astronaut John Grunsfeld, associate administrator for NASA's Science Mission Directorate, shared Stofan's optimism, predicting that signs of life will be found relatively soon both in our own solar system and beyond.

"I think we're one generation away in our solar system, whether it's on an icy moon or on Mars, and one generation [away] on a planet around a nearby star," Grunsfeld said during Tuesday's event.

Many habitable environments

Recent discoveries suggest that the solar system and broader Milky Way galaxy teem with environments that could support life as we know it, Grunsfeld said.

For example, oceans of liquid water slosh beneath the icy shells of the Jupiter moons Europa and Ganymede, as well as that of the Saturn satellite Enceladus. Oceans covered much of Mars in the ancient past, and seasonal dark streaks observed on the Red Planet's surface today may be caused by salty flowing water.

Further, NASA's Curiosity rover has found carbon-containing organic molecules and "fixed" nitrogen, basic ingredients necessary for Earth-like life, on the Martian surface.

Farther afield, observations by NASA's Kepler space telescope suggest that nearly every star in the sky hosts planets - and many of these worlds may be habitable. Indeed, Kepler's work has shown that rocky worlds like Earth and Mars are probably more common throughout the galaxy than gas giants such as Saturn and Jupiter.

And just as the solar system is awash in water, so is the greater galaxy, said Paul Hertz, director of NASA's Astrophysics Division.

The Milky Way is "a soggy place," Hertz said during Tuesday's event. "We can see water in the interstellar clouds from which planetary systems and stellar systems form. We can see water in the disks of debris that are going to become planetary systems around other stars, and we can even see comets being dissipated in other solar systems as [their] star evaporates them." [6 Most Likely Places for Alien Life in the Solar System]

Looking for life

Hunting for evidence of alien life is a much trickier proposition than identifying potentially habitable environments. But researchers are working steadily toward that more involved and ambitious goal, Stofan and others said.

For example, the agency's next Mars rover, scheduled to launch in 2020, will search for signs of past life and cache samples for a possible return to Earth for analysis. NASA also aims to land astronauts on Mars in the 2030s - a step Stofan regards as key to the search for Mars life.

"I'm a field geologist; I go out and break open rocks and look for fossils," Stofan said. "Those are hard to find. So I have a bias that it's eventually going to take humans on the surface of Mars - field geologists, astrobiologists, chemists - actually out there looking for that good evidence of life that we can bring back to Earth for all the scientists to argue about."

NASA is also planning out a mission to Europa, which may launch as early as 2022. The main goal of this $2.1 billion mission will be to shed light on the icy moon's potential habitability, but it could also search for signs of alien life: Agency officials are considering ways to sample and study the plumes of water vapor that apparently erupt from Europa's south polar region.

In the exoplanet realm, the agency's James Webb Space Telescope (JWST), an $8.8 billion instrument scheduled to launch in 2018, will scope out the atmospheres of nearby "super-Earth" alien planets, looking for gases that may have been produced by life.

JWST will scan the starlight that passes through the air of super-Earths, which are more massive than our own planet but significantly less so than gaseous worlds such as Uranus and Neptune. This method, called transit spectroscopy, will likely not work for potentially habitable Earth-size worlds, Hertz said.

Searching for biosignature gases on small, rocky exoplanets will instead probably require direct imaging of these worlds, using a "coronagraph" to block out the overwhelming glare of their parent stars, Hertz added.

NASA's potential Wide-Field Infrared Survey Telescope, which may launch in the mid-2020s if given the official go-ahead, would include a coronagraph for exoplanet observations.

Article by By Mike Wall, SPACE.com
Source: csmonitor.com
About the Author
You May Also Like
DEC 05, 2020
Space & Astronomy
First Sunspot Image From World's Largest Solar Telescope
DEC 05, 2020
First Sunspot Image From World's Largest Solar Telescope
The National Science Foundation's Daniel K. Inouye Solar Telescope produced this stunning image of a sunspot earlier thi ...
FEB 03, 2021
Space & Astronomy
Get Ready for the Red Planet: Perseverance Set to Land in Two Weeks
FEB 03, 2021
Get Ready for the Red Planet: Perseverance Set to Land in Two Weeks
NASA's Perseverance Rover will be reaching Mars soon and it will have to go through a seven minute descent before we kno ...
APR 17, 2021
Space & Astronomy
Dent in Earth's Magnetic Field Caused by Buried Ancient World
APR 17, 2021
Dent in Earth's Magnetic Field Caused by Buried Ancient World
Researchers from Arizona State University have suggested that two giant blobs of rock cupping the Earth's core are l ...
MAY 04, 2021
Space & Astronomy
Part of a Chinese Rocket is Expected to Fall to Earth Soon
MAY 04, 2021
Part of a Chinese Rocket is Expected to Fall to Earth Soon
In the next few days, part of a rocket that put China's new space station into orbit will fall back to Earth in an uncon ...
MAY 09, 2021
Space & Astronomy
NASA's Ingenuity Helicopter Completes Its First One-Way Trip on Mars
MAY 09, 2021
NASA's Ingenuity Helicopter Completes Its First One-Way Trip on Mars
NASA sent the Perseverance rover to Mars loaded with cutting edge technology, one piece of which is a robotic helicopter ...
MAY 21, 2021
Space & Astronomy
Alien Radioactive Element Discovered on Earth for First Time
MAY 21, 2021
Alien Radioactive Element Discovered on Earth for First Time
  Researchers from Australian National University have discovered the first ever extraterrestrial radioactive isoto ...
Loading Comments...