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Exoplanets

Parent Category: Planetary Science
Exoplanets, or extra-solar planets, are those planets which revolve around stars other than our Sun. A large number of Exoplanets have been detected and many more are continually added to the list.
Exoplanet GJ 1214 b takes about 52.7 (+- 5.3 ) days to rotate on its axis.
The first confirmation of exoplanets occurred in 1992, two planets in orbit around a Pulsar PSR B1257+12.
There are eight planets in the solar system, plus five dwarf planets.
Science hasn't yet discovered which planets house extra-terrestrials neither have they assigned names to them.
Nothing much. Their orbits are outside of the radius of the sun while in the gas giant phase.
It would have to have: Liquid on its surface (Temperature)AtmosphereStable orbitNeeds about Earth's gravity
Exoplanets are located in other solar systems. They are planets that have been detected orbiting other stars, by causing the star (or their sun) to 'wobble' as the bodies exert their gravitational pull on each other.
Well, there is a technique called the 'Wobble' Technique. Theoretically, when a planet is rotating around a star, the star is slightly 'wobbled' around due to the gravitational force of the exoplanet. Scientists search for 'wobbling' stars and find exoplanets in this way. Another technique is the...
At over 772 light years away, it is difficult to say if this Star has any planets, yet alone if there are any moons of those planets. Theres a chance, but we may never know the answer.
It actually has already. The Flat Transmission Spectrum of the Super-Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope http://xxx.lanl.gov/abs/1111.5621
The first confirmed exoplanet is called 51 Pegasi b. It was discovered on October 6th 1995 by Michel Mayor and Didier Queloz. Note: 51 Pegasi or 51 Pegasi a is the parent star.
Doppler spectroscopy, also known as radial velocity measurement, has been the method used to find most of the 500+ confirmed exoplanets so far. It looks at how the spectrum from the star shifts as it changes radial velocity, due to a planets gravity effecting its movement.
You can have a multiple star system; many are known. They are gravitationally stable and have the form of binary pairs of stars in concentric orbits about the most massive pair. In theory a system of 220 is possible, but such a system would have to a galaxy unto itself. If it were inside a galaxy it...
Jupiter, Saturn, Uranus and Neptune are all Jovian planets.
Since stars are massive and bright, and planets are tiny and dark. even the VLT can't spot them. So they use computers to track the star's position in 3d space. If the star wobbles, it's a good sign there is a planet tugging at the star. Using this method, they can use advanced software to find out...
so far no life has been found other than on our planet. However, on Titan, the largest moon of saturn, they have found Amino Acids, the most basic form of DNA, which suggests a form of life may begin there, if not already. a probe sent to the moon was recovered after being subjected to -272 degrees...
Accreted matter, after the suns development and ignition. The accreted matter formed the planets with help from the suns gravity and billions of years of development. Enormous clouds of gas and matter eventually coalesce under the force of gravity from accumulating for long periods of time, forming...
Either by actually seeing it with telescopes, or by seeing the effect that it's gravity has on nearby objects.
Gliese 581 g, an Earth like planet, Wasp 17b, a gas giant bigger than Jupiter, Kepler 11b.
We obviously don't know what the hottest exoplanet is but the highest estimated recording we have is of the planet HD 149026 b which is 2038 C or 3700 F
Yes, they all do - but not much.
Because they have been observed. Not only by indirect means but also by optical means - when a planet moves across the front of a star.
51 Pegasi became the first known exoplanet in the autumn of 1995.After the announcement, on October 12, 1995, confirmation came from Dr. Geoffrey Marcy from San Francisco State University and Dr. Paul Butler from the University of California, Berkeley using the Hamilton Spectrograph at the Lick...
In our Solar System, highly unlikely. The only "possible" place a planet could lurk is beyond the Kuiper Belt. It has been hypothesised, but so far nothing has been seen. This does not discount that there "may" be another planet out there, it just hasn't been observed. Computer simulations propose...
No because microlensing requires the object being to be producing a  light source and a plant doesn't. Even if a planet were reflecting  light it wouldn't be enough to be seen.
You can't. Perhaps your grand children or great grand children or  maybe great great grandchildren might. At he moment, March 08,  2015, even though it is possible to design an engine that would get  a craft to something 20 light years away, there is no technology  available that would let...
It actually can and is used to detect extrasolar planets, mostly through watching their transits, where they move in front of the star and block some of its light.
nobody has found any proof there are trees. but if trees did exist on any other planets, then they would probably be; for example if the star the planet was orbiting was red, then the tree's leave's would probably be the colour of the sun, except at the opposite spectrum.
The distances between the stars are so great that no one can travel to another star in his or her lifetime.   It may not be for thousands or tens of thousands of years, but I am very confident that we or the creatures that evolve from us will one day travel to other stars.
Jupiter is the largest planet in our solar system.We don't know the largest planet in the whole of space.
20.5 Light Years away from Earth.
Scientist use extremely powerful telescopes and machines to measure  the brightness of stars. If a planet were to pass in front of the  star than the stars brightness may dip by 1/1000th of a percent.  The telescopes are so powerful that they are able to measure this  dip and thus allow...
No. At 20.5 light years from Earth, and it only having been discovered, AND Terrans not having developed extra-light speed craft or wormhole technology, it would not be possible for anyone to have arrived at Gliese 581 G yet.
It would gradually move from a South Westerly position when setting to more of a westerly position as the days get longer and summer is approached. It will also remain in the sky for longer and arc higher and higher in the sky until the summer solstice in June.
There have been 95 exoplanets discovered in 2010. You'll need to be more specific on the question.
Goldilocks Zone or Goldilocks Planet.
Besides the fact that it exists, very little. We know - approximately - what orbit it is in, and how far away it is from the parent star. We can calculate, VERY roughly, what the surface temperature of the planet might be, based on the brightness of the star and the distance to the planet. We can...
We humans evolved here on Earth, in Earthlike conditions. W're pretty adaptable, though, so we could probably survive on a bigger planet with somewhat heavier gravity (perhaps up to 1.5gs!) or a smaller planet with less. But too little gravity and it wouldn't be enough to retain an atmosphere....
Planets are simply named by adding a letter to the host star name. The first planet found orbiting GJ 581 is called GJ 581 b (where A corresponds to the star). The 2nd discovered planet is GJ 581 c, and so on.
Gliese 581g lies in a zone called "the Goldilocks zone" or habitable zone [See related question]. It's an area in a planets orbit, where liquid water is likely to occur and thus harbour life. It's not too hot or too cold. (As in the porridge) It can also refer to a planet that is close to the size...
The furthest planets from Earth are Exoplanets (or extrasolar planets), which are outside our solar system and are in orbit around other local stars. So far, over 500 have been detected. The furthest confirmed exoplanet so far is MOA-2008-BLG-310L, which is over 20,000 light years away. No doubt...
Because Gliese 581 g, if it exists, is located near the middle of the habitable zone (or Goldilocks zone - [See related question]) of its parent star.
exoplanets can be located orbiting any star. there are not any imparticuler stars that have more or less chance of a star system. today we have found well over 200 exoplanets.
So far only one extrasolar planet has officially been confirmed as rocky, but many dozens are assumed to be rocky. This is because a planet must have both its size AND its mass measured to confirm it as rocky or gaseous, but almost all extrasolar planets have only had their masses measured due to...
The planet Gliece does not exist. Are you thinking of the Gliese 581 system?
From your location, it wont change its phase pattern, but viewed from other places on Earth, its orientation will be different.
Some probably can. A few have been discovered in the habitable  zones around their stars, though there other factors in whether or  not a planet can support life. Most, however, orbit too close or  too far from their stars to support any form of life as we know it.
"The 3" is just plain wrong; much more than 3 exoplanets have been  found so far.
Impossible to tell given current technology.
Can't beat Wikipedia for most things. See related link for the Drake Equation"
Kepler 10b was discovered on the 10th January 2011
Because of their distance from us. The light emitted by such  planets is very faint, compared to their host stars, the planets  are very, very close to their host stars (as seen by us), and the  star outshines them (i.e., an object of the same brightness would  be easier to observe without the...
It may be possible. This exosolar planet, three to four times the size of Earth and 20 light years away, is thought to be in the right place in relation to the sun - in the middle of the `habitable` zone. If it has a rocky surface, then liquid water may be abundant on the surface. It is the closest...
The possibility of water vapour.
There is no Planet Goldilocks. The term "Goldilocks planet" refers  to any planet that orbits in the habitable zone of its star, which  is the area where a planet might be the right temperature to  support liquid water, which might be able to sustain life. While we  have discovered several such...
There is no inherent property of exoplanets that means they cannot  harbor life. Some probably do harbor life. However, most exoplanets  orbit too close or too far from their stars, making them too hot or  too cold. A few orbit in the "habitable zone," meaning they may  support liquid water and...
This exosolar planet would take 12,400 years to reach, travelling at the speed of light.
First and recently are mutually exclusive and cannot be answered
The star attracts the planet; the planet attracts the star. As a  result of the latter, the star changes position. If this change is  such that the star moves away from us during one part of the  planet's orbit, and towards us at another (or more generally, the  star's speed towards us, or away...
It would take 25.5 years to travel 25.5 light years if you were to travel at the speed of light - 670 million miles per hour. For the space probe Voyager 1, currently leaving our system at 38185mph, it would take 448,000 years to get there.
We don't know what it's like outside the universe because the big bang caused the expansion of mass, so were pretty sure nothing happens outside the universe.
Yes. While we know relatively little about the atmospheres of  individual expolanets, there is no reason an exoplanet couldn't  have an exosphere.
Gilese 581G is. It's in it's red dwarf's "goldilocks zone" and is about 3 tnimes as large, and may contain water.
Well, besides the obvious one ... that the intensity of light and heat from the sun is less at greater distances ... there's another one that's much less obvious: The number (time to complete one orbit of the sun) 2 / (average distance from the sun) 3 is the same number for each body...
No. The people who saw it might have seen Mercury. Nibiru does not exist.
Tres-4 has a radius of about 1.799 that of Jupiter [See related question]
Not all planets have less gravity than earth. Some, like Jupiter, have much more gravity. the ones that do have less gravity, it is because they have less mass.
Because the Sun is more massive than the Earth. If the Earth was more massive than the Sun, then it would.
Unlikely, but if a VERY stong force were to do something to a planet. Its possibly, but like i said its VERY unlikely.
Yes, that is how Earth's formed, it hit a large protoplanet called Theia.
No. That's precisely the main difference between planets and stars - that stars can have nuclear fusion, planets not.
Some planets can indeed eject radiation.
No, a planet does not collapse because gravity isn't strong enough to provide enough pressure to crush a planet. You might make a planet heavier and heavier as to increase its gravity but at some point the pressure in the planet's core will be high enough to support nuclear fusion and the planet...
When you say ecliptic I assume you mean along the equator or latitude lines. Yes and no. While we know that gas giant's often form moons in this area, we have a perfect example in Uranus that shows in exo-solar systems gas giants may also form moons in other locations. In Uranus it's probably closer...
Well my oldest boy mark would say oops! And my youngest boy reese would say u just tooted!!
Planets can't just "explode". If one did, it probably wouldn't make any difference to the rest of the solar system; the star in the system would still be thousands of times more massive.
No. The moon is always the smaller body in such a system. The smaller object will always be the one doing the orbiting.
Sure - by colliding with other objects. The Earth gets a few tons heavier every DAY, from meteorites and space dust falling through the atmosphere. Back when the solar system was very new, it was filled with perhaps dozens of planet-sized bodies and millions of assorted space rocks. Some of those...
At that distance, there would be no planet - just vaporised gasses.
A planet cannot explode on it's own. A star would experience very little changes if a planet did explode, even one as large as Jupiter.
Iron has nothing to do with it. A planet cannot explode - unless something massive hits it.
An object requires a source of energy to shine. The Earth does not. Pictures of the Earth are always taken with the reflection of the Suns energy - similar to how you see the Moon.
That's not possible a star is a sun, planets revolve around a star, and the planet would be destroyed far far far far far before the star reached it, if that was even possible
It would explode. NOTHING is "billions of degrees hot"; at temperatures of "only" a few hundred million degrees, the very atoms themselves would disintegrate into pure energy.
I suppose it could, but how could the core of the planet GET HOTTER? This only happens in comic books; Jor-El's home planet of Krypton exploded, and the baby Kal-El fled in a rocket ship to Earth, becoming Superman. In reality, the cores of planets can't get hotter unless some outside force...
Of the exoplanets found, the vast majority are gaseous bodies. However, that does not mean the majority are. That is just the majority we have found so far.
Mars could come close to housing bacteria, if it had more water. So it could have in the past. After that, well....Mercury is too cold AND too hot, Venus is crazily uninhabitable, Earth is obvious, Mars we covered....There is a possibility of a subsurface ocean on Europa, a Galilean moon of Jupiter,...
Explode is a very selective term. The process of exploding (like Superman's Krypton) will not happen to a planet. However a planet can be reduced to large chunks and have all the appearance of having exploded by: contact with another large body (collision)being disrupted by tidal forces In either...
Unless a planet is made from an explosive compound or is shot with a nuclear bomb, then it is unlikly to explode in the first place.However, if the star exploded, then all the planets orbiting that star, would most likely be caught in the blast.
It's difficult enough for a planet to form in a binary star system, let alone for life to evolve on it. However, we thought that Gas Giants belonged outside of the "Ice Line" [See related question] but we were wrong. So it's possible, but unlikely. The gravitational effects of the binary stars,...
You might be talking about Mercury, if not I'm going to assume you are talking about Vulcan, the hypothetical planet that during the 19th century was believed to exist between Mercury and the sun and was supposed to be the cause of Mercury's unusual orbit. Indeed Edmond Modeste Lescarbault believed...
561 BCE -Croesus becomes king of Lydia
Yes and they still are. We have used radio waves to try and send  signals to stars or star clusters where life might be present.
No. Planets don't explode. The only planet EVER to explode was Krypton, the home of Superman. He, and it, were entirely fictional.