Coldest known object in universe has an eerily ghost-like appearance

Washington, Oct 25 (ANI): The Boomerang Nebula is the coldest known object in the Universe at a cosmologically crisp one degree Kelvin (minus 458 degrees Fahrenheit), scientists have claimed.

In fact, it is colder than the faint afterglow of the Big Bang, which is the natural background temperature of space.

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) telescope have taken a new look at this intriguing object to learn more about its frigid properties and determine its true shape, which has an eerily ghost-like appearance.

As originally observed with ground-based telescopes, this nebula appeared lopsided, which is how it got its name.

Later observations with the Hubble Space Telescope revealed a bow-tie-like structure.

The new ALMA data, however, reveal that the Hubble image tells only part of the story, and the twin lobes seen in that image may actually be a trick of the light as seen at visible wavelengths.

"This ultra-cold object is extremely intriguing and we're learning much more about its true nature with ALMA," Raghvendra Sahai, a researcher and principal scientist at NASA's Jet Propulsion Laboratory in Pasadena, California, and lead author said.

"What seemed like a double lobe, or 'boomerang' shape, from Earth-based optical telescopes, is actually a much broader structure that is expanding rapidly into space," he said.

The Boomerang Nebula, located about 5,000 light-years away in the constellation Centaurus, is a relatively young example of an object known as a planetary nebula.

Planetary nebulae, contrary to their name, are actually the end-of-life phases of stars like our Sun that have sloughed off their outer layers.

What remains at their centers are white dwarf stars, which emit intense ultraviolet radiation that causes the gas in the nebulae to glow and emit light in brilliant colors.

The Boomerang is a pre-planetary nebula, representing the stage in a star's life immediately preceding the planetary nebula phase, when the central star is not yet hot enough to emit sufficient ultraviolet radiation to produce the characteristic glow.

At this stage, the nebula is seen by starlight reflecting off its dust grains.

The outflow of gas from this particular star is expanding rapidly and cooling itself in the process. This is similar in principle to the way refrigerators use expanding gas to produce cold temperatures. The researchers were able to take the temperature of the gas in the nebula by seeing how it absorbed the cosmic microwave background radiation, which has a very uniform temperature of 2.8 degrees Kelvin (minus 455 degrees Fahrenheit).

The findings are published in the Astrophysical Journal. (ANI)

Matches

MORE TOP STORIES TODAY

Bowling worries for Super Kings

Bowling worries for Super Kings

After failing to defend a mammoth 205 against Kings XI Punjab, Chennai have a lot to think about. More »

Punjab pull off another big chase

Punjab pull off another big chase

GAME 7, SHARJAH—Maxwell, Miller, Pujara chase down Rajasthan's 192. More »

T20 test for Cheteshwar Pujara

T20 test for Cheteshwar Pujara

The class act from Saurashtra may have to rethink his approach to the mannerless format. More »

BCCI reputation lowest in 80 years: Manohar

BCCI reputation lowest in 80 years: Manohar

The former BCCI president says he was "disillusioned" by the happenings at the emergent working committee meeting on Sunday. More »

Special meeting to replace Srinivasan

Special meeting to replace Srinivasan

The BCCI is likely to convene a special general body meeting (SGM) in May to replace N Srinivasan on the board's disciplinary committee. More »

Shastri in proposed IPL probe panel

Shastri in proposed IPL probe panel

Some members stressed on the need for proposing names with an "impeccable record and clean image". More »

Roach escapes injury after car crash

Roach escapes injury after car crash

The West Indies fast bowler lost control of his BMW sedan due to slippery road conditions in his native Barbados on Saturday. More »

Repose faith in Indian coaches

Repose faith in Indian coaches

All of them cost plenty of dollars which I feel is unnecessary for a two- month tournament, says former cricketer Yajurvindra Singh. More »

Cook relieved after period in limbo

Cook relieved after period in limbo

The England captain is looking forward to a fresh start after a dispiriting Ashes defeat last year. More »

Panel can help clean mess: Raghavan

Panel can help clean mess: Raghavan

The former CBI Director is one of the three candidates proposed by the BCCI to head the enquiry into the IPL betting and spot-fixing scandal. More »

[INTERVIEW] Jayawardene and Sangakkara

[INTERVIEW] Jayawardene and Sangakkara

Mahela Jayawardene and Kumar Sangakkara go over their World T20 win, and feel grateful to have fans whose support remains unwavering in victory and de… More »

Need to improve fielding: Ashwin

Need to improve fielding: Ashwin

[T20 Newsline] Lacklustre Super Kings, fast-improving Sanju Samson and other news from IPL-7. More »

Aussie coach joins emerging Afghanistan

Aussie coach joins emerging Afghanistan

Peter Anderson has started work in Kabul as the fast-developing team prepare for their debut at next year's World Cup. More »

Chaos threatens to engulf SL again

Chaos threatens to engulf SL again

As Lanka's head coach decides to jump ship, euphoria over winning an ICC tournament has dissipated into fuistration. More »

Jayasuriya unhappy at Farbrace conduct

Jayasuriya unhappy at Farbrace conduct

Sri Lanka's chief selector is upset at news of head coach Paul Farbrace's possible move to England. More »

Have nothing to prove to anybody — Sehwag

Have nothing to prove to anybody — Sehwag

The Nawab of Najafgarh says a good run in IPL could help his chances of a comeback on India's tour to England in June. More »

Duminy steals first win for Delhi

Duminy steals first win for Delhi

Furious fifties by Duminy and Dinesh Karthik end a long losing streak for the Daredevils. More »

Five things England must do to bounce back

Five things England must do to bounce back

England have appointed a new head coach in Peter Moores. More »

AB, Parthiv seal Bangalore's second win

AB, Parthiv seal Bangalore's second win

Royal Challengers overcame a stutter to cruise to the small target they were set by Mumbai Indians. More »

‘Felt like helpless minority’

‘Felt like helpless minority’

Former BCCI treasurer Ajay Shirke says emotions got the better of Srinivasan and he tried to oversimplify things by calling Meiyappan an “enthusiast.” More »

Royal test for Kings

Royal test for Kings

Preview — Clash of philosophies between Australia-centric teams More »

No way back for Pietersen: ECB

No way back for Pietersen: ECB

Kevin Pietersen's hopes of reviving his international career appeared to end Saturday when ECB managing director Paul Downton said there was 'no way back'… More »

The world record that nearly wasn't

The world record that nearly wasn't

Twenty years ago this week, Brian Lara became Test cricket's highest scorer, but he almost didn't make it. More »

Srinivasan can attend BCCI meeting

Srinivasan can attend BCCI meeting

His status as president of TNCA makes him eligible to attend the Working Committee meeting on Sunday. More »