What does Pluto really look like? We'll soon find out.

As it closes is on Pluto, NASA's New Horizons spacecraft is snapping ever-sharper images of the dwarf planet, revealing clues about variations on the icy world's surface.

|
NASA/JHU-APL/SwRI
Pluto and it largest moon, Charon, imaged by the Long Range Reconnaissance Imager (LORRI) on NASA’s New Horizons spacecraft April 12-18.

Sen—New images of the dwarf planet Pluto, taken by NASA’s fast-approaching New Horizons spacecraft, confirm Hubble Space Telescope observations that the diminutive icy body has sharp differences in how much sunlight is being reflected off its surface.

Scientists don’t yet know if the variations are due to geology, topography or chemical composition, but scientists expect to be able to sort out that mystery as New Horizons completes its 9.5-year, 3 billion-plus mile journey to Pluto, with a closest approach slated for July 14, 2015.

“We are very excited to be at Pluto’s doorstep,” New Horizons lead scientist, Alan Stern, with the Southwest Research Institute, Boulder, Colorado, told reporters on a conference call on Wednesday.

In addition to its variable surface features, scientists may have found an early clue that Pluto has a polar ice cap.

By some measures, the images taken by New Horizons earlier this month and released on Wednesday, are more detailed than those taken with the Earth-orbiting Hubble observatory.

“We can make higher resolution images, but we’re not yet as sensitive to faint objects as the Hubble is,” Stern said.

That will change dramatically as New Horizons covers the final 60 million miles to Pluto, which has never been visited by a spacecraft before.

Between the late 1970s and the late 1980s, NASA’s twin Voyager probes made it past Jupiter, Saturn, Uranus and Neptune, before heading out toward interstellar space.

Pluto, previously considered the ninth planet circling the Sun, was demoted to dwarf planet status in 2006 after the discovery of similar, elliptically orbiting icy worlds in the outer Solar System, a region known as the Kuiper Belt.

At the most distant part of its eccentric orbit, Pluto travels almost 50 times farther away from the Sun as Earth. Pluto also periodically orbits closer to the Sun than Neptune.

Little is known about the Kuiper Belt, though scientists believe it is filled with remnants left over from the formation of the Solar System.

New Horizons will not only explore Pluto, but its largest moon Charon, which oddly shows a very different chemical mix of materials on its surface. The spacecraft also will study Pluto’s four known smaller moons and look for other orbiting companions.

NASA expects another batch of New Horizons images to be taken mid-May.

“We are truly entering an entirely new realm of the Solar System, exploring the Kuiper Belt and beyond. Who knows what we’ll find out,” said NASA associate administrator for science John Grunsfeld.

Related Links:

New Horizons, our mission to explore Pluto

New Horizons' science campaign at Pluto has officially begun!

Blog: New Horizons at Pluto: Its all about Ralph and Alice

Original story from Sen. © 2015 Sen TV Limited. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. For more space news visit Sen.com and follow @sen on Twitter.

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 What does Pluto really look like? We'll soon find out.
Read this article in
https://www.csmonitor.com/Science/2015/0430/What-does-Pluto-really-look-like-We-ll-soon-find-out
QR Code to Subscription page
Start your subscription today
https://www.csmonitor.com/subscribe