Are there planets going around other stars?

Answer 1

These values are very approximate and work on the principal of life meaning something akin to life on Earth.

The more we get to know about "silicon" creatures or hydrogen floating "species" then this can be thrown out of the proverbial window.

It is only a very simplistic view of what *could* be.
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There are about 100 billion galaxies in the Universe.
On average, say, each galaxy contains 100 billion stars.
That's a total of 10,000,000,000,000,000,000,000 stars.

Now astronomers believe that 50% of all stars are part of a binary (or more) system and because of the orbit of the binary pair, the existence of any life, close to a rotating binary pair is slim - but not impossible. However, for simplicity, lets remove 50% of the stars. We are now left with 5,000,000,000,000,000,000,000 stars.

Now, life has to exist around a star that is "burning", so a red giant or a red dwarf are not likely candidates for extrasolar life. It's not impossible, but lets keep it simple. 80% of all stars are in this category, so reject them and we are left with 1,000,000,000,000,000,000,000 stars.

For intelligent life to evolve, we need time, so we need a star that will last a long time. Hot bright stars, are very hot and burn out way too quickly. So let's reduce them - about 5%, so 950,000,000,000,000,000,000.

This is an approximate number of class F, G and K stars - ours is a G star. Those that are not part of a binary or more star system.

So this equates to about 9,500,000,000 possible stars per galaxy that are of the "right" type.

Now the Earth is pretty special - we know this. It has to be right distance from Earth (The Goldilocks zone). It has to be a certain mass to "hold" onto an atmosphere, and it needs a molten core to produce a Van Allan belt to protect life from solar radiation.

So let's say there is a one in a billion chance of all these things happening around one of "our" stars. This means that there is only a "best" chance of 9 1/2 stars in a galaxy having the "right stuff".

Oh dear - not very good - especially as the Milky Way - our Galaxy has upwards of 200 billion stars, Only nine of them are possible areas for life!!!!

So let's change that to a one in a million chance.

That gives us a chance of 9,500 possible stars in a galaxy.

Much better.

*NOTE* This is all a very rough approximation.

Answer 2

Nobody knows for certain .... yet!

However, statistically the chances are that somewhere among the billions of stars and potentially trillions of planets that surround them there is some form of life.

This life could be as insignificant as a single celled organism or far more complex than anything on Earth, the truth is that nobody knows for sure. To be scientifically proven there must be irrefutable evidence and none exists at at this moment in time.

Answer 3

No, not yet. It's pretty obvious that there are some; after all, practically every star nearby has turned out to have planets, but our telescopes aren't yet good enough to detect planets so far away.

Answer 4

Great question.

There are two reasons. The initial spinning was caused because of conservation of angular momentum. As the planets formed, dust and dirt and rock began clumping together, as they clumped together, they spun faster and faster, giving the planets their original spinning rotation.

The second reason, is because one side of the planet is a little closer to the sun then the far side, so it experiences a slightly greater gravitational force, and so accelerates a little more, causing the planet to spin. This rotating force may or may not go in the same direction as the original spin, and those planets further away from the sun experience it less (and so maintain more of their initial spin, while closer planets have more of the gravitational spin).

Answer 5

No, so far, they haven't even found life (outside of planet Earth) within our own galaxy.

No, so far, they haven't even found life (outside of planet Earth) within our own galaxy.

No, so far, they haven't even found life (outside of planet Earth) within our own galaxy.

No, so far, they haven't even found life (outside of planet Earth) within our own galaxy.

Answer 6

Both. It rotates on it's axis and revolves around the sun.

Answer 7

Around the Sun. Or, if it is an "extrasolar" planet, around some other star.

Answer 8

we are still not able to detect any extra galactial planets.Therefore it is hard to tell it

Answer 9

The Earth rotates on an axis 23.1 to 24.5 degrees around the sun on a tilt.

Answer 10

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