Exoplanet around Alpha Centauri is nearest-ever - BBC News [fornadablog.blogspot.com]
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[fornadablog.blogspot.com], Exoplanet around Alpha Centauri is nearest-ever - BBC News
Our nearest stellar neighbours have been the subject of study since ancient times
Astronomers have found the nearest planet outside our Solar System, circling one of the stars of Alpha Centauri just four light-years away.
The planet has at minimum the same mass as Earth, but circles its star far closer than Mercury orbits our Sun.
It is therefore outside the "habitable zone" denoting the possibility of life, as the researchers report in Nature.
However, studies on exoplanets increasingly show that a star with one planet is likely to have several.
At the very least, the work answers the question first posed in ancient times about planets around our nearest stellar neighbours.
The closest star to the Sun is Proxima Centauri, which is believed to be part of a three-star system that includes the brighter stars Alpha Centauri A and B.
The planet was found near Alpha Centauri B by the Harps instrument at the European Southern Observatory's La Silla facility in Chile.
That puts it far closer to Earth than any of the more than 840 confirmed exoplanets
Like a dance between one enormous and one tiny partner, as an exoplanet orbits its much larger host star, its gravity causes the star to move in a small orbit.
What is redshift?
- The term "redshift" arises from the fact that light from more distant objects shows up on Earth more red than when it left its source
- The colour shift comes about because of the Doppler effect, which acts to "stretch" or "compress" waves from moving objects
- It is at work in the sound of a moving siren: an approaching siren sounds higher-pitched and a receding one sounds lower-pitched
- In the case of light, approaching objects appear more blue and receding objects appear more red
- The expansion of the Universe is accelerating, so in general, more distant objects are moving away from us (and each other, and everything else) more quickly than nearer ones
- At cosmic distances, the shift can profoundly affect the colour - the factor by which the wavelength is "stretched" is called the redshift
Harps and instruments like it measure the subtle change in colour - the redshift or blueshift - of the host star's light as its orbit moves it slightly closer to and further away from Earth.
The planet whips around Alpha Centauri B in just 3.6 days, and is estimated to have a surface temperature of about 1,200C.
Many planets in similar orbits are "tidally locked", meaning the same side is always facing the host star, but further observations will be required to find out if that is the case
Since the very first planets outside our solar system were discovered in the early 1990s, the hope has been to find an "Earth twin" - a planet like ours, orbiting a star like ours, at a distance like ours.
The new planet around Alpha Centauri B matches Earth only in terms of its mass - making it among the smallest exoplanets we know of.
But in a catalogue with hundreds of confirmed planets and thousands of planet candidates added since 1992, it is otherwise unremarkable - except for its proximity.
"Alpha Centauri B is of course a very special case - it's our next door neighbour," said Stephane Udry of the Observatory in Geneva and senior author of the paper.
"So even if the discovery just stands perfectly normally in the discoveries we have had up to now, it's a landmark discovery, because it's very low-mass and it's our closest neighbour."
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Question by Deppster: What causes tiny clear "water" blisters on your hands? I have what looks like small water blisters on the side of one of my fingers and I was wondering what the cause could be? I do wash my hands often, I wonder if that could cause it? I also use latex gloves when I clean the restroom... wonder if it's a allergic reaction? Best answer for What causes tiny clear "water" blisters on your hands?:
Answer by Pastel_Princess Answer by Branden Answer by Sean F Answer by Liz R Answer by Tim W Answer by biogirl
Could be a allergic reaction to latex.. Or could be from doing work and the friction of the gloves rubbing against your hands causing the blisters..
I'd see a doctor. Never heard of that before its definately never happened to me.
It could be small burns if the water you use to clean your hands is too hot.
Could be latex gloves,or could be a heat rash.
Fungus.
Could be a spider bite. I've gotten these - they're really tiny, and they stay for a very long time.
Related What causes tiny clear "water" blisters on your hands? Issues
Questgiver: Said Zone: Scorched Desert (Egypt) Type: Action Click on the timings below to see the parts in the video. 2:15 Ancient Marya Atheneum (Solo Instance) 2:52 Earth fragment 3:26 Fire fragment 5:14 Water fragment 6:45 Air fragment 8:22 Altar of Learning 9:29 Sacrificial altar ---------------------------------------------------------- The Secret World Guide for this mission secretworld.wikia.com My channels www.youtube.com tgn.tv ---------------------------------------------------------- - THE SECRET WORLD - Developer: FunCom Release: 3 July 2012 / 29 June 2012 (pre-order) Genre: Massive Multiplayer Online RPG, Action Adventure Platform: PC Publisher: Electronic Arts Funcom Website: www.thesecretworld.com www.darkdaysarecoming.com ---------------------------------------------------------- ★ The Secret World ★ - The High Cost of Dying
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