NASA menjumpai 7 planet baru

black.hitam

NASA Announces 7 New Planets That Could Hold LifeCP [size=0.9375em] |  By        Marcia Dunn, The Associated Press


Posted: 02/22/2017 1:31 pm EST Updated: 4 hours ago

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CAPE CANAVERAL, Fla. — For the first time ever, astronomers have discovered seven Earth-size planets orbiting a nearby star — and these new worlds could hold life.

This cluster of planets is less than 40 light-years away in the constellation Aquarius, according to NASA and the Belgian-led research team who announced the discovery Wednesday.

The planets circle tightly around a dim dwarf star called Trappist-1, barely the size of Jupiter. Three are in the so-called habitable zone, where liquid water and, possibly life, might exist. The others are right on the doorstep.

Scientists said they need to study the atmospheres before determining whether these rocky, terrestrial planets could support some sort of life. But it already shows just how many Earth-size planets could be out there — especially in a star's sweet spot, ripe for extraterrestrial life.

The takeaway from all this is, "we've made a crucial step toward finding if there is life out there,'' said the University of Cambridge's Amaury Triaud, one of the researchers. The potential for more Earth-size planets in our Milky Way galaxy is mind-boggling.

"There are 200 billion stars in our galaxy,'' said co-author Emmanuel Jehin of the University of Liege. So do an account. You multiply this by 10, and you have the number of Earth-size planets in the galaxy — which is a lot."

Last spring, the University of Liege's Michael Gillon and his team reported finding three planets around Trappist-1. Now the count is up to seven, and Gillon said there could be more. Their latest findings appear in the journal Nature.

This compact solar system is reminiscent of Jupiter and its Galilean moons, according to the researchers.

This artist's rendition imagines what the newly-discovered planets around dim dwarf star Trappist-1 may look like, based on data about their sizes, masses, and orbital distances.

Picture this: If Trappist-1 were our sun, all seven planets would be inside Mercury's orbit. Mercury is the innermost planet of our own solar system.

The ultracool star at the heart of this system would shine 200 times dimmer than our sun, a perpetual twilight as we know it. And the star would glow red — maybe salmon-colored, the researchers speculate.

"The spectacle would be beautiful because every now and then, you would see another planet, maybe about as big as twice the moon in the sky, depending on which planet you're on and which planet you look at,'' Triaud said Tuesday in a teleconference with reporters.

'The seven sisters of planet Earth'

The Leiden Observatory's Ignas Snellen, who was not involved in the study, is excited by the prospect of learning more about what he calls "the seven sisters of planet Earth.'' In a companion article in Nature, he said Gillon's team could have been lucky in nabbing so many terrestrial planets in one stellar swoop.

"But finding seven transiting Earth-sized planets in such a small sample suggests that the solar system with its four (sub-) Earth-sized planets might be nothing out of the ordinary,'' Snellen wrote.

Gillon and his team used both ground and space telescopes to identify and track the planets, which they label simply by lowercase letters, "b'' through "h.'' As is typical in these cases, the letter "A'' — in upper case — is reserved for the star. Planets cast shadows on their star as they pass in front of it; that's how the scientists spotted them.

"... finding seven transiting Earth-sized planets in such a small sample suggests that the solar system ... might be nothing out of the ordinary.''
— Ignas Snellen, The Leiden Observatory

Tiny, cold stars like Trappist-1 were long shunned by exoplanet-hunters (exoplanets are those outside our solar system). But the Belgian astronomers decided to seek them out, building a telescope in Chile to observe 60 of the closest ultracool dwarf stars. Their Trappist telescope lent its name to this star.

While faint, the Trappist-1 star is close by cosmic standards, allowing astronomers to study the atmospheres of its seven temperate planets. All seven look to be solid like Earth — mostly rocky and possibly icy, too.

They all appear to be tidally locked, which means the same side continually faces the star, just like the same side of our moon always faces us. Life could still exist at these places, the researchers explained.

"Here, if life managed to thrive and releases gases similar to that that we have on Earth, then we will know,'' Triaud said.

Chemical analyses should indicate life with perhaps 99 per cent confidence, Gillon noted. But he added: "We will never be completely sure'' without going there.

terpaku

ummah tanah ait takkan berminat dgn topik ni..mereka lebih berminat dgn isu  fattah amin bercinta dgn nelopak

airfilterkotor

Scientists discover seven Earth-sized planets orbiting nearby star

Rising hope of finding a "second Earth" out there in the cosmos, scientists announced Wednesday that they've found three planets circling a relatively nearby star that could be hospitable enough to support life.

They are among seven planets discovered orbiting the star known as TRAPPIST-1, about 39 light years from Earth in the Milky Way.

The scientists — some from the Space Telescope Science Institute in Baltimore — plan to probe the planets in coming years with advanced telescopes, including the Hubble Space Telescope and its planned successor, the James Webb Space Telescope.

The findings published Wednesday in the journal Nature increase scientific confidence that searching the heavens could turn up signs of life.

"We know there must be many more potential life-bearing planets out there just waiting to be found," said Sara Seager, a professor of planetary science and physics at Massachusetts Institute of Technology.



The TRAPPIST-1 system, which would take 44 million years to reach via jet plane, scientists said, was identified by a Chile-based observatory known as Transiting Planets and Planetesimals Small Telescope, or TRAPPIST.

The observatory announced last spring that there were three planets in the system and astronomers began probing it with NASA's Hubble and Spitzer Space Telescopes.

In research published last summer, Hubble showed two of the planets did not have inhospitable hydrogen- and helium-dominated atmospheres. Nikole Lewis, an astronomer at the Baltimore institute who was among the panelists at NASA's Wednesday press conference, said that raised hope that the planets could support life.

Nearly three weeks of observations from the Spitzer telescope showed TRAPPIST-1 to be different in many ways from Earth's solar system, but nonetheless capable of holding worlds teeming with water and life.

Scientists trained that observatory on the TRAPPIST-1 system using a technique in which they watch objects pass in front of the star, revealing the rest of the system. That showed the four additional planets and their Earth-like qualities.

The three planets that are considered the strongest candidates for habitation receive similar amounts of light from their star as Earth and Mars do, though they are significantly closer to it than any objects are to the sun. TRAPPIST-1 is a red dwarf that is 200 times dimmer than the sun and significantly smaller — if the sun were the size of a basketball, TRAPPIST-1 would be the size of a golf ball.

Two of the planets are about the same size as Earth, while the third is 13 percent larger. Their densities suggest they are rocky, and scientists suspect their surface temperatures could allow them to hold oceans of liquid water.

On all three of the planets, a solar year passes in less than 12 days. A neighboring planet that is closest to TRAPPIST-1 orbits the star once every day and a half.

All seven planets within the system are closer to their star than Mercury, our solar system's innermost planet, is to the sun. But, because TRAPPIST-1 is a weak red dwarf, the three planets likely have surface temperatures similar to Venus, Earth and Mars, the scientists said.

Scientists said they are so close together that a person standing on the surface of any one of them would be able to see the others big and bright in the sky, like the moon is seen from Earth, but with even more beauty.

"The TRAPPIST-1 system has really captured our imagination," Seager said.

Scientists had never before found so many Earth-like planets around a single star.

"The discovery gives us a hint that finding a second Earth is not just a matter of if, but when," said Thomas Zurbuchen, associate administrator of the science mission directorate at NASA.

Work to learn more about the planets and how to detect potential life on them will now ramp up.

Lewis said Hubble will continue to probe the planets to reveal whether they have substantial atmospheres and, if so, what elements they contain.

She also expects the James Webb Space Telescope, which was largely assembled at NASA's Goddard Space Flight Center in Greenbelt and is scheduled to launch next year, will look at the system early in its mission. Both telescopes have spectrographs — instruments that can reveal the composition of the atmospheres.

"It'll take a lot of observations with Hubble and Webb to detect water," Lewis said. "We are certainly looking."

The Spitzer telescope, which NASA launched in 2003, was better suited to detect the planets than TRAPPIST because it observes from space and Hubble because it observes in infrared light. Hubble, launched in 1990, observes in mostly visible light. The view from the TRAPPIST telescope and other ground-based infrared telescopes can be clouded by Earth's own radiation.

Observing in infrared allows scientists to see through dust and to detect relatively cool objects, such as the TRAPPIST-1 star.

"This is the most exciting discovery we've had yet with Spitzer in almost 14 years of observation," said Sean Carey, manager of NASA's Spitzer Science Center in California.

But once the Webb telescope gets up and running, scientists can use it and Hubble together to fine-tune observations and get a clearer picture of the planets, Lewis said.

The Space Telescope institute manages the Hubble's scientific mission from its offices on the Johns Hopkins University's Homewood campus. It will do the same for Webb, in addition to housing its operations center.

"The two have to work in tandem to holistically understand these planets," she said.

airfilterkotor

Ker, nak bincang pasal Maharaja Lawak Megashit 2017...?

airfilterkotor

CiliPadiSedap

akak punya imagination tahun 2050, ada LRT daripada masjid jamek ke planet serupa bumi ini..

sebenarnya membazir kos minyak naik space x atau pun virgin space.. kita boleh bina rail LRT lagi jimat..dan guna elektrik.

Simunggu

terpaku replied at 23-2-2017 08:27 AM
ummah tanah ait takkan berminat dgn topik ni..mereka lebih berminat dgn isu  fattah amin bercinta dg ...

tak ..kamu salah...mereka lagi berminat cerita petanah pak seman pasal 1emdb & gst di kedai mamak...

terpaku

Simunggu replied at 23-2-2017 09:24 AM
tak ..kamu salah...mereka lagi berminat cerita petanah pak seman pasal 1emdb & gst di kedai mamak. ...

kamu pula masih tidur depan atm tunggu brim ya

tripleid

kalu ikut teori lebai pondok,ummah kapiaq gigih kaji pasal planet lain sbb nak lari drpd kiamat kat bumi

ninjago

CiliPadiSedap replied at 23-2-2017 08:21 AM
akak punya imagination tahun 2050, ada LRT daripada masjid jamek ke planet serupa bumi ini..
...

hmmmmmm tinggi naw imaginationmu itu kakak!!

pakis_hutan

Ok aku super teruja..

pakis_hutan

Ok aku super teruja..

batmana

kat bumi pn dh byk kerosakan.
lagi nk buat kt planet lain.

cukup2la tu.

puccafan

Pasni bole la guna dialog "tak suka dok sini, pegi dok planet lain"

Ada kemungkinan tak, yang dikatakan kiamat tu sebenarnya waktu kematian bumi. Bumi musnah dan waktu tu, manusia dah berevolusi, dah pindah planet lain yg tak tercemar lagi, so beautiful and wonderful like heaven

Mati la kena hencap dengan lobai dan lobainita

mbhcsf

airfilterkotor replied at 23-2-2017 08:47 AM
Scientists discover seven Earth-sized planets orbiting nearby star

Rising hope of finding a "seco ...

interesting ye, analysis  yg menyeluruh setiap planet tu yg dua kecik tu belum ada lagi ye...curiosu jugak nak tahu komposisi udara , pepejal dan gas .....
depa dok cari kompisis planet yg boleh support life ni...

airfilterkotor

mbhcsf replied at 23-2-2017 10:09 AM
interesting ye, analysis  yg menyeluruh setiap planet tu yg dua kecik tu belum ada lagi ye...curio ...

Kena tunggu teleskop James Webb siap tahun depan.

spiderman80

Semoga planet2 baru dijumpai itu ada perkhidmatan Internet.

xy_daen

Bila Annunaki nak balik ni..

airfilterkotor

spiderman80 replied at 23-2-2017 02:26 PM
Semoga planet2 baru dijumpai itu ada perkhidmatan Internet.

Spidey... jarak dia 39 tahun cahaya dari bumi.
Nasa kata kalau naik jet makan 44 juta tahun baru sampai ke sana.

Maknanya kalau kita semua mati hidup balik mati hidup balik mati hidup balik 9 kali dalam katebang pun, masih tak sampai destinasi lagi.

Oleh yang demikian, pakai jer perkhidmatan internet kat bumi ni. Bersyukurlah dengan apa yang ada.

azimodin

Ni kalau geng2 Flat Earth baca mesti hencap "ini semua tipu daya yahudi". Tapi kalau betul2 boleh menjadi habitat manusia tetaap x mampu nak gi. Bak kata tuan tanah, mati idup balik 9 kali pon belum tentu sampai. Kecuali la teknologi membolehkan kita hibernate dan x jadi tua sehingga sampai kat planet2 tu.