Water found on an alien world

जुलाई 12, 2007 at 11:10 अपराह्न टिप्पणी छोड्नुहोस्

watervpor.jpgAstronomers on Wednesday announced they had spotted the first planet beyond the solar system that has water, the precious ingredient for life. The watery world, though, is far beyond the reach of our puny chemically-powered rockets – and in any case is quite uninhabitable.

It is made of gas rather than rock and its atmosphere reaches temperatures hot enough to melt steel, which means the water exists only as superheated steam. The find, named HD189733b, is about 15% bigger than our Jupiter and orbits a star in the constellation of Vulpecula the Fox.

It was spotted by a team led by Giovanna Tinetti of the European Space Agency (ESA) and University College London. As HD189733b swung in front of its star, it absorbed part of the spectrum of starlight in a telltale way that can only be explained by the presence of water in its atmosphere.

Extrasolar worlds – also called exoplanets – were first spotted in 1995.

So far, 245 of them have been spotted, according to the Extrasolar Planets Encyclopaedia (http://exoplanet.eu/), and the tally is growing at the rate of three or four a month.hd-209458b.jpg

Planet would be hell for humans

Virtually all of the discoveries have been made indirectly, mainly by a “wobble” in light, seen from Earth, when the planet swings around its star.

The change in light is a fingerprint that can yield many clues about the planet’s size, orbit and atmosphere. But this is the first time that astronomers have been able to confirm that water is present.

“Although HD189733b is far from being habitable and actually provides a rather hostile environment, our discovery shows that water might be more common out there than previously thought,” said Tinetti.

“Our method can be used in the future to study more ‘life-friendly’ environments.”

The planet’s star, HD 189733, is similar in size to our Sun, but a bit cooler.

But the planet itself would be hell for humans.

Orbiting cheek by jowel to the star, at a distance that is 30 times closer than that between the Earth and the Sun, parts of the planet’s atmosphere reach 2 000 degrees Celsius.

This seething temperature is reached on the side of the planet that always faces the star. By comparison, the other side of the planet is relatively balmy, with a low of 500 C.

Tinetti’s team used Nasa’s Spitzer orbiting telescope, using its infrared sensors to pick out the tiny signature that occurs when water vapour absorbs light from a star.

The big prize is to spot a rocky planet that lies in the so-called Goldilocks Zone, where the temperature is not so hot that water evaporates, nor so cold that it is perpetually frozen, but “just right”, enabling water to exist in liquid form.

“The ‘Holy Grail’ for today’s planet-hunters is to find an Earth-like planet that also has water in its atmosphere,” explained Tinetti.

“When it happens, the discovery will provide real evidence that planets outside our solar system might harbour life. Finding the existence of water on an extra-solar gas giant is a vital milestone along that road of discovery.”

Related article – Experts findout new solar systems

Entry filed under: अन्तरिक्ष बिज्ञान, रोचक कुरा, technology. Tags: .

Kissing : 16 Interesting Facts Pirates of the Constitution

जवाफ लेख्नुहोस्

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Trackback this post  |  Subscribe to the comments via RSS Feed


नेपालको समय र तापमान

छिमेकिको दैलोमा चिहाउने कि ?

RSS नेपाल प्लस

  • ईटालीको ब्यापारिक मेलामा नेपालीपनि
    इटालीको उत्तरपूर्वी शहर पादोभा संपन्न छ । सुसंस्क्रित छ । यहाँ वार्षिक रुपमा ब्यापारिक मेला लाग्छ । अहिले एशियाली अर्थात तिनको भाषामा ओरिएन्टल मेला लागिरहेको छ । यसको अर्थ एशियाली हस्तकला, संस्क्रिति र ब्यापारिक सामग्रिलाई प्रोत्साहन गर्ने, चिनाउने हो । यसमा थोरै नेपालीले भाग लिएका छन् । एभेरस्ट क्राफ्टका तर्फबाट एन आर एन स्विजरल्याण्डका पूर्व […] […]
    admin

RSS अनलाइन खसखस

  • फिरफिरे, बुद्धिसागरको नयाँ उपन्यास बजारमा आउने तयारी गर्दा कभर फोटो बिवाद
    बुद्धिसागरको नयाँ उपन्यास "फिरफिरे" बजारमा आउने तयारी गर्दा कभर फोटो बिवाद शुरु भएको छ । स्टक फोटोलाइ कभरमा राख्दा चोरिको भएको वा प्रयोगको लागि पुर्ण अधिकार नभएको अनलाइन सोसल मिडियहरुमा शंका गरिएका थिए ।त्यस्ता शंकाहरुको जवाफमा बुद्धिसागरले कसैले मुद्धा हालिदिएमा सृजनात्मक चोरीमा धेरै फाइन तिर्नु पर्ने हुनाले आफुले त्यस्तो जोखिम नउठाउने बताएका छन् […]
    noreply@blogger.com (RB)

RSS हाम्रो ब्लग

  • An error has occurred; the feed is probably down. Try again later.

RSS The road to Nowhere goes everywhere….

  • प्लाष्टिकका झोला:प्रतिबन्ध कि पुनर्प्रशोधन?
    एक महिनाजति पहिलेपोखराबाटप्रकाशितहुनेएउटादैनिकमाछापिएको एउटा समाचारको शीर्षक थियो ‘पोखरामा प्लाष्टिकका झोला तथा गिलास मुक्त नगर घोषणाको तयारी पुन: शुरु’। उक्त समाचारको शिर्षकले मेरो मनमा दुईवटा वैकल्पिक अर्थ सुझाएको थियो। पहिलो, पोखरामा यस्तो घोषणा पहिल्यै गरिसकिएको तर त्यो असफल भएको र यसैले फेरि घोषणा गर्न आवश्यक परेको। दोश्रो, पहिला तयारी गरेर पनि घोषणा गर […]
    Basanta

RSS मेरो बिचार र अभिव्यक्तिको साझा चौतारी

  • के भएको थियो ९० सालको भूकम्पमा ?
    यही वैशाख १२, १३ र २९ का ठूला भूकम्प र त्यस बीचमा गएका सयौं का परकम्प र ‘धक्का’ सँगै नेपालमा घटेका विगतका ठूला भूकम्पको बारेका खोज र कौतूहल पनि बढेको छ । भूकम्प मूलतः प्राकृतिक घटना भएपनि ठूला भूकम्पहरू एउटा “अविस्मरणीय खाटा”का रूपमा देशको इतिहासमा रहन्छन् । अहिलेको विनाशकारी भूकम्पभन्दा अगाडिको कुरा गर्ने हो भने ९० साल अर्थात् सन १९३४ को भूकम्प नै नेपालको ल […]
    Dilip Acharya

मेरो ढुकुटी

अनलाईन कती जना ?

who's online

यो साइट १४ अप्रिल २००७ देखी

Web Page Counter
Free Web Counters

औ पटक हेरी सकिएको छ ।

Calander

जुलाई 2007
M T W T F S S
« Jun   Aug »
 1
2345678
9101112131415
16171819202122
23242526272829
3031