NASA continues exploration of unknown planets orbiting stars outside our solar system

NASA will be launching a surveying satellite into space to search for exoplanets that could sustain life. Discoveries will be explored with larger telescopes which will search for water and atmospheric gases that are indicative of life.

|
NASA/Reuters
TESS, the Transiting Exoplanet Survey Satellite, will be sent into orbit from the Kennedy Space Center in Florida aboard a SpaceX Falcon 9 rocket set for blastoff sometime between April 16 and June 2018 on a two-year mission to search for exoplanets.

The search for worlds circling stars far beyond our solar system will resume in the coming weeks with the National Aeronautics and Space Administration's launch of a spacecraft scientists hope will enlarge the known catalog of so-called exoplanets believed capable of supporting life.

NASA plans to send the Transiting Exoplanet Survey Satellite, or TESS, into orbit from the Kennedy Space Center in Florida aboard a SpaceX Falcon 9 rocket set for blast-off between April 16 and June on a two-year, $337-million mission.

The latest NASA astrophysics endeavor is designed to build on the work of its predecessor, the Kepler space telescope, which discovered the bulk of some 3,500 exoplanets documented during the past 20 years, revolutionizing one of the newest fields in space science.

NASA expects TESS to detect thousands more previously unknown worlds, perhaps hundreds of them Earth-sized or "super-Earth"-sized – no larger than twice as big as our home planet.

Such worlds are believed to stand the greatest chance of having rocky surfaces or oceans, and are thus considered the most promising candidates for the evolution of life, as opposed to gas giants similar to Jupiter or Neptune.

Astronomers hope to end up with anywhere from 10 to 30 more rocky exoplanets for further study.

The new probe will take about 60 days to attain its highly elliptical, first-of-a-kind orbit that will loop TESS between Earth and the moon every two and a half weeks.

Kepler's positioning system broke down in 2013, about four years after its launch, and it has nearly run out of fuel.

"So it's perfect timing that we'll be launching TESS to continue the great activity of looking for planets around stars other than our sun and thinking about what it might mean for life in the universe," Paul Hertz, NASA's director of astrophysics, told reporters at a news briefing in Washington on Wednesday.

TESS, roughly the size of a refrigerator with solar-panel wings, is equipped with four special cameras to survey 200,000 stars that are relatively near the sun and thus among the brightest in the sky, seeking out those with planets of their own.

Like Kepler, TESS will use a detection method called transit photometry, which looks for periodic, repetitive dips in the visible light from stars star caused by planets passing, or transiting, in front of them.

But unlike Kepler, which fixed its glare on stars within a tiny fraction of the sky, TESS will scan the majority of the heavens for shorter periods and focus much of its attention on stars called red dwarfs, which are smaller, cooler, and longer-lived than our sun.

One reason is red dwarfs have a high propensity for Earth-sized, presumably rocky planets, making them potentially fertile ground for closer examination, said David Latham, TESS science director for the Harvard-Smithsonian Center for Astrophysics.

Also because red dwarfs are so small, and their planets orbit more closely than the Earth does to the sun, the dip in light from a planetary transit of a red dwarf is more pronounced compared with a larger star, Mr. Latham said.

"It's easier to find interesting planets around smaller stars," he said.

Measuring dips in starlight can determine the exoplanet's size and orbital path. Further observations from ground telescopes can supply its mass and ultimately the planet's density and composition – whether largely solid, liquid, or gas.

Latham said fewer than 10 rocky, Earth- or super-Earth-sized planets have previously been confirmed, and NASA hopes to double or triple that number through the TESS mission.

The most favorable discoveries will undergo closer scrutiny by a new generation of larger, more powerful telescopes now under development that will search for telltale signs of water and "the kinds of gases in their atmospheres that on Earth are an indication of life," Mr. Hertz said.

"TESS itself will not be able to find life beyond Earth, but TESS will help us figure out where to point our larger telescopes," he said.

This story was reported by Reuters.

You've read  of  free articles. Subscribe to continue.
Real news can be honest, hopeful, credible, constructive.
What is the Monitor difference? Tackling the tough headlines – with humanity. Listening to sources – with respect. Seeing the story that others are missing by reporting what so often gets overlooked: the values that connect us. That’s Monitor reporting – news that changes how you see the world.

Dear Reader,

About a year ago, I happened upon this statement about the Monitor in the Harvard Business Review – under the charming heading of “do things that don’t interest you”:

“Many things that end up” being meaningful, writes social scientist Joseph Grenny, “have come from conference workshops, articles, or online videos that began as a chore and ended with an insight. My work in Kenya, for example, was heavily influenced by a Christian Science Monitor article I had forced myself to read 10 years earlier. Sometimes, we call things ‘boring’ simply because they lie outside the box we are currently in.”

If you were to come up with a punchline to a joke about the Monitor, that would probably be it. We’re seen as being global, fair, insightful, and perhaps a bit too earnest. We’re the bran muffin of journalism.

But you know what? We change lives. And I’m going to argue that we change lives precisely because we force open that too-small box that most human beings think they live in.

The Monitor is a peculiar little publication that’s hard for the world to figure out. We’re run by a church, but we’re not only for church members and we’re not about converting people. We’re known as being fair even as the world becomes as polarized as at any time since the newspaper’s founding in 1908.

We have a mission beyond circulation, we want to bridge divides. We’re about kicking down the door of thought everywhere and saying, “You are bigger and more capable than you realize. And we can prove it.”

If you’re looking for bran muffin journalism, you can subscribe to the Monitor for $15. You’ll get the Monitor Weekly magazine, the Monitor Daily email, and unlimited access to CSMonitor.com.

QR Code to NASA continues exploration of unknown planets orbiting stars outside our solar system
Read this article in
https://www.csmonitor.com/Science/Spacebound/2018/0329/NASA-continues-exploration-of-unknown-planets-orbiting-stars-outside-our-solar-system
QR Code to Subscription page
Start your subscription today
https://www.csmonitor.com/subscribe