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Langit biru dan air es ditemukan di Pluto

Date:

October 8, 2015

Source:

NASA

Summary:

Gambar warna pertama dari Hazes atmosfer Pluto  , dikirim  oleh pesawat ruang angkasa NASA New Horizons  pekan lalu , mengungkapkan bahwa Hazes berwarna biru .

.......... " Siapa yang harapkan langit biru di Sabuk Kuiper ? ... cantik, " kata Alan Stern ,peneliti utama  New Horizons  dari Southwest Research Institute ( SwRI ) , Boulder , Colorado .

Kabut partikel sendiri cenderung abu-abu atau merah, tapi cara mereka menghamburkan cahaya biru telah mendapat perhatian dari tim sains New Horizons . "  warna biru mencolok   memberitahu kita tentang ukuran dan komposisi partikel kabut , " kata peneliti tim sains Carly Howett , juga dari SwRI . " . Sebuah langit biru sering hasil dari hamburan cahaya matahari oleh partikel yang sangat kecil Di Bumi , partikel-partikel tersebut adalah molekul nitrogen yang sangat kecil . Pada Pluto mereka tampak lebih besar - . Tapi masih relatif kecil - . Partikel seperti jelaga  yang kita sebut tholins ".....more

Blue skies and
water ice discovered on Pluto

Date:

October 8, 2015

Source:

NASA

Summary:

The first color images of Pluto's atmospheric hazes, returned by NASA's New
Horizons spacecraft last week, reveal that the hazes are blue.

.................

The first color images of Pluto's atmospheric hazes, returned by NASA's New
Horizons spacecraft last week, reveal that the hazes are blue.

"Who would have expected a blue sky in the Kuiper Belt? It's
gorgeous," said Alan Stern, New Horizons principal investigator from
Southwest Research Institute (SwRI), Boulder, Colorado.

The haze particles themselves are likely gray or red, but the way they
scatter blue light has gotten the attention of the New Horizons science team.
"That striking blue tint tells us about the size and composition of the
haze particles," said science team researcher Carly Howett, also of SwRI.
"A blue sky often results from scattering of sunlight by very small
particles. On Earth, those particles are very tiny nitrogen molecules. On Pluto
they appear to be larger -- but still relatively small -- soot-like particles
we call tholins."

Scientists believe the tholin particles form high in the atmosphere, where
ultraviolet sunlight breaks apart and ionizes nitrogen and methane molecules
and allows them to react with one another to form more and more complex
negatively and positively charged ions. When they recombine, they form very
complex macromolecules, a process first found to occur in the upper atmosphere
of Saturn's moon Titan. The more complex molecules continue to combine and grow
until they become small particles; volatile gases condense and coat their
surfaces with ice frost before they have time to fall through the atmosphere to
the surface, where they add to Pluto's red coloring.

In a second significant finding, New Horizons has detected numerous small,
exposed regions of water ice on Pluto. The discovery was made from data
collected by the Ralph spectral composition mapper on New Horizons.

"Large expanses of Pluto don't show exposed water ice," said
science team member Jason Cook, of SwRI, "because it's apparently masked
by other, more volatile ices across most of the planet. Understanding why water
appears exactly where it does, and not in other places, is a challenge that we
are digging into."

A curious aspect of the detection is that the areas showing the most
obvious water ice spectral signatures correspond to areas that are bright red
in recently released color images. "I'm surprised that this water ice is
so red," says Silvia Protopapa, a science team member from the University
of Maryland, College Park. "We don't yet understand the relationship
between water ice and the reddish tholin colorants on Pluto's surface."

The New Horizons spacecraft is currently 3.1 billion miles (5 billion
kilometers) from Earth, with all systems healthy and operating normally.







Story Source:

The above post is reprinted from materials provided by NASA.Note: Materials may be edited for content and length.

http://www.sciencedaily.com/releases/2015/10/151008173926.htm

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