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Exoplanets

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.

500 Questions

How many exoplanets so far?

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Asked by Wiki User

Are there 50 hours in a day?

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Asked by Wiki User

No. There are 24 hours in a day.

On Earth, that is pretty standard, but there could be other planets with a 50 hour day. Here are the approximate day lengths (defining a day by the time it takes a planet to rotate once on its axis) for the rest of the planets in the Solar System:

Mercury: 58 Earth days

Venus: 243 Earth days

Mars: 25 hours

Jupiter: 10 hours

Saturn: 11 hours

Uranus: 17 hours

Neptune: 16 hours

Unfortunately nothing in our own Solar System comes close, but we are always finding new planets and we might find one that has a 50 hour day someday.

When was the first exoplanet discovered?

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Asked by Wiki User

As of April 2009, 346 exoplanets are listed in the Extrasolar Planets Encyclopaedia. The vast majority have been detected through radial velocity observations and other indirect methods rather than actual imaging.

The first confirmed radial velocity detection was made in 1995, revealing a gas giant planet in a four-day orbit around the nearby G-type star 51 Pegasi.

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Is Planet X a real thing?

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Asked by Wiki User

That is unknown. "Planet X" is the name given to a hypothetical planet beyond Neptune (or beyond Pluto, when it was still considered a planet). No planet is known to exist in our Solar System beyond planet Neptune, but one might still be found.


What would the sky color on terrestrial exoplanets be like?

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Asked by Cheatsguy777

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.

What is the name of the new gas planet found near our sun?

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Asked by Wiki User

No new gas giant planet has been discovered in our solar system.

Do exoplanets have bacteria?

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Asked by Wiki User

Try putting the question into Google:

http://www.panspermia.org/bacteria.htm

http://www.space.com/scienceastronomy/solarsystem/mars_bacteria_000112_wg.HTML

Not only can certain bacteria survive in space, animals can as well. As shown by the European space agency, when they sent some tardigrades up in a space craft:

http://space.newscientist.com/article/dn14690-water-bears-are-first-animal-to-survive-space-vacuum.HTML

http://esciencenews.com/articles/2008/09/09/unique.animal.species.can.survive.space

What is the atmosphere of gliese 581 c?

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Asked by Wiki User

Earth is similar to Gliese 581 c, in that they both are the third planet from their sun. See related links for information about Gliese 581 c.

What makes neptunes rings unique?

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Asked by Wiki User

part of neptunes rings are thick and thin. they are also twisted and made of rocks there are 5 of them

Can a planet explode if it's core is way too hot?

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Asked by Wiki User

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 CAUSED it to get hotter.

Why is it difficult to find evidence if there is life on other planets?

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Asked by Wiki User

It is difficult to get to the planets to observe them closely. Much of life (bacteria) would only be observable under a microscope, and even the largest living beings known on Earth wouldn't be observable from a telescope from Earth, for example.

What is the time required for the earth to rotate once on its axis called?

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Asked by Wiki User

That period of time is called a " sidereal day ". That's not the period of time for your clock
or wristwatch to make a complete rotation.

The earth's rotation is 23hours 56minutes and roughly 4seconds.

What is CJ667Cc?

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Asked by Vaishob1

It is a planet which, as scientists claimed, has traces of water which may be favourable to life. This planet is 33 light years away.

What planets are large fast moving and made mostly of glass?

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Asked by Wiki User

No planet is made of glass, as far as I know. The giant planets - Jupiter, Saturn, Uranus, Neptune - are large, and made mostly of gas. However, they are not fast-moving.


The inner planets - Mercury, Venus, Earth, Mars - are slow, fast-moving, and made basically of rock.


Why can animals or human beings live on Gliese 581 g?

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Asked by Wiki User

because it has 10 degrees and -31 10 degrees on day side and -31 on the night side

How big is TrES-4?

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Asked by Wiki User

Tres-4 has a radius of about 1.799 that of Jupiter [See related question]

What is the significance of the discovery of exoplanets?

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Asked by Wiki User

We know now that planets are a fairly common occurrence in the universe. This discovery provides many potential opportunities for life to exist beyond Earth.

How does the mass of a planet affect its habitability?

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Asked by WickedWitchOfTheWest

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....

How many rocky extra solar planets are discovered?

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Asked by Wiki User

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 technical difficulties of measuring a distant planet's size. Most planets significantly less massive than Neptune are assumed to be rocky.

What is the hottest exoplanet?

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Asked by Wiki User

We don't know all of the planets that are in the universe, only a very small amount. The hottest one in our solar system would be Venus.

The hottest exoplanet discovered as of March 10, 2008 is called "WASP-12b", and it's mean temperature is about 2240 Degrees C, or 4070 degrees F.

Source:

http://www.iop.org/EJ/abstract/0004-637X/693/2/1920

How was the planet Kepler 22b named?

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Asked by Wiki User

Kepler-22b was given its the designation Kepler as it is one of many planets discovered by the Kepler observatory. The 22b refers to it being the innermost (and only known) planet orbiting the star Kepler-22.