do u think there is other earth like planets outside are solar system?

Question

if so do u think there are humans livin on them similar to us

Answer 1

The Drake Equation provides a useful way of thinking about these issues,

This equation was devised by Dr. Frank Drake (a professor at the University of California, Santa Cruz) in the 1960s in an attempt to estimate the number of extraterrestrial civilizations in our galaxy with which we might come in contact. The main purpose of the equation is to allow scientists to quantify the uncertainty of the factors which determine the number of extraterrestrial civilizations. In recent years, the Rare Earth hypothesis, which posits that conditions for intelligent life are quite rare in the universe has been seen as a possible refutation of the equation.

The Drake equation states that:

N (the number of civilizations in our galaxy with which we might expect to be able to communicate at any given time) is the product of the following factors:

R* which is the rate of star formation in our galaxy
fp which is the fraction of those stars that have planets
ne which is the average number of planets that can potentially support life per star that has planets
fl which is the fraction of the above that actually go on to develop life
fi which is the fraction of the above that actually go on to develop intelligent life
fc which is the fraction of the above that are willing and able to communicate
L which is the expected lifetime of such a civilization

NB the Drake Equation only considers the 200-400 billion stars in our galaxy, as the issue is being able to communicate with them, and stars in other galaxies are considered too far away for that. However there are billions of galaxies and that increases the probability of intelligent life elsewhere in the Universe considerably.

The rare Earth hypothesis asserts that the emergence of complex multicellular life (metazoa) on Earth required an extremely unlikely combination of astrophysical and geological circumstances. Hence such life is probably very rare in the universe. The rare Earth hypothesis is explained in detail in the book Rare Earth: Why Complex Life Is Uncommon in the Universe, by Peter Ward, a geologist and paleontologist, and Donald Brownlee, an astronomer and astrobiologist.

The rare Earth hypothesis is the contrary of the principle of mediocrity, also called the Copernican principle, whose best known recent advocates include Carl Sagan and Frank Drake. The principle of mediocrity maintains that the Earth is a typical planet in a typical planetary system, located in an unexceptional region of a large but conventional spiral galaxy. Ward and Brownlee argue to the contrary: planets and planetary systems that are as friendly to complex life as are the Earth and its solar system, are probably extremely rare in the universe. The Earth could well be the only planet in our galaxy, the Milky Way, and even in the entire universe, bearing complex life.

If complex life can evolve only on an Earth-like planet, then the rare Earth hypothesis solves the Fermi paradox (Webb 2002): "If extraterrestrial aliens exist, why aren't they obvious?" There is no evidence of aliens because none exist in the Milky Way. Hence the current lack of evidence of extraterrestrial civilizations.

The rare Earth hypothesis approaches the issue of habitable planets like this:

The galactic habitable zone

A great deal of the known universe cannot support life because of elementary astrophysical and chemical considerations. Rare Earth refers to such regions as "dead zones." The exceptions make up the galactic habitable zones, the result of opposing tendencies that are a function of distance from the galactic center. As that distance increases:

(1) The metal content of stars declines. Because metals are the fundamental building blocks of life, the likelihood of life is a decreasing function of distance from the galactic center.

(2) The X-ray and gamma ray radiation from the black hole at the galactic center, and from nearby neutron stars and quasars, becomes less intense. Radiation of this nature is incompatible with complex life.

(3) Gravitational perturbation of planets and planetesimals by nearby stars becomes less likely. Hence the further a planet lies from the galactic center, the less that it will be struck by a large bolide. (A bolide is an extraterrestrial body that collides with the Earth or another planet)

A sufficiently large bolide impact can extinguish all complex life on a planet.

Such considerations suggest that the galactic habitable zone will have the shape of an annulus whose center is the galactic center.

The density of stars near the center of the galaxy is so high that the amount of cosmic radiation there precludes the emergence of life. The complex and delicate chemistry of life also requires an environment lacking high energy (x-ray and gamma) radiation and fast moving particles. Quasars, neutron stars, magnetars, supernovae, and black holes emit lethal high energy radiation and fast moving particles.

Life can also evolve only on planets whose orbits are stable over long periods of time and hence free of gravitational disruption. This rules out regions of galaxies where stars are close enough to one another to permit them to disrupt the planetary systems of nearby stars. Hence the early universe, and regions where the stellar density is high and supernovae not rare, such as galactic inner regions, globular clusters, and the spiral arms of spiral galaxies, are all unfit for life.

Given that a planetary system happens to enjoy a location propitious for complex life, it must maintain that location for the billions of years required for complex life to emerge. Hence the central star must have a galactic orbit that steers clear of galactic regions where radiation levels are high, such as the galactic center and the spiral arms.

If the central star's galactic orbit is eccentric (egg-shaped), it will pass through some spiral arms. Hence the central star must have a nearly circular orbit about the center of its galaxy. Moreover, it must have an orbital velocity equal to the rotational velocity of the spiral arms. Otherwise a central star not in a spiral arm will gradually drift into one. The required synchronization of the orbital velocity of a central star with the rotational velocity of the galaxy containing it can occur only within a fairly narrow range of distances from the galactic center.

The orbit of the Sun around the center of the Milky Way is almost perfectly circular, with a period of 226 Ma, one closely matching the rotational period of the galaxy. The Sun's orbit is so perfect that it has remained clear of the spiral arms of the Milky Way over its entire 4.6Ba lifetime.

Such close matches are possible only for stars located in a narrow ring about the galactic center, making up the galactic habitable zone. According to Guillermo Gonzalez, at most 5% of stars in the Milky Way lie within the galactic habitable zone. Lineweaver et al (2004) calculated that the galactic habitable zone is an annular ring 7 to 9 kiloparsecs in diameter, including no more than 10% of the stars in the Milky Way.

I have tried to summarise the two main theories and you pays your money, you takes your choice, as to which you think is nearer the truth. Optimists will tend to choose Drake's Equation and pessimists will tend to choose the Rare Earth Hypothesis, I suspect!

Answer 2

I would be very surprised indeed If there were not thousands If not billions of Earth like planets beyond our Solar system. As for Humans, I don't know about that but I think life throughout the Universe is the norm, not the exception. We are not alone!!

Answer 3

We are ourselves, located in one of the arms of our spiral galaxy, The Milky Way....It is currently estimated to be 100,000 light Years in diameter...Consider this, if you were able to travel one light year, the distance you would cover is 5.87 billion miles. That means that the total distance across our galaxy is 100,000 x 5,870,000,000,000 miles,...a considerable amount. Consequently the Milky Way is full of billions of suns just like ours, who no doubt have their own set of circulating planets just like we do. It is therefore reasonable to assume that other forms of life exist in each of these places. Some of them may have been around many more years than us and perhaps are much more advanced as a result. Others not so old and are going through a process as we did when early man walked this Earth. The main problem with we Earthlings is that we just cannot take in these vast distances and the thought that we may never know just what it all means. becomes very frustrating........how did we get here...why are we at the exact distance from our sun to be able to survive...a million miles closer and we would boil....a million miles further away and we would freeze...why is it that in an eclipse, the Moon exactly fits the diameter of the sun when it is a million times smaller, how can it be at just the right distace from the Earth to cover the sun.....all these questions and many more will present themselves the more you look at it all.....just keep an open mind,be fascinated by it all and read as much as you can.

Answer 4

yes , there are other planets outside the solar system because as we all know that universe is very vast.The solar system is just part of the universe. Solar system is not big as the universe. Therefore , there are humans / living creatures there but their appearance is different from us. Aliens are more ugly , etc.

Answer 5

There are thousands of Suns and solar systems similar to our system is present in the galaxies.It is possible that life similar to human beings or super human being is possible somewhere in this universe.The Bible,Old Testament people refer to visitors from heaven.Hindu scriptures refers to life in 14 worlds(including earth) and lie in moon,mars and Venus thousands years ago.Who knows man himself might have come from elsewhere.when living conditions became some where impossible.The hypothesis is based on that Man is not similar to other animals on earth(except monkey).The sudden exist of dinosaurs may be due to alien attack and colonisation of Earth and no satisfactory explanation can be given.

Answer 6

Life form on any planet is the result of biological processes developing over time in direct correlation complimentary to the respective environment.
I therefore conclude that the odds are in favour of another planet playing host to some other form of life form.
As for the aliens we see on films - what environment would require its inhabitants to develop a 1 eyed head, green skin and a body with as much as muscle as a deckchair?

Answer 7

Yes there is actually one. If u go to Nasa website there is a column written about a planet that is 21 light years away from our solar system. They reckon there might be life in that planet just like ours.

Answer 8

There must be- as you are surely an alien. No
Earthling would write "IS other earth like planets" instead of
"ARE other Earth like planets". Neither would any intelligent human write "outside ARE solar system" instead of "outside OUR solar system". Based on my analysis you must be some type of alien yourself.

Answer 9

I, myself well say yes! there are lots of such kind of planets!
cause there are lots of stars which have some planets around them, just like our sun. but nowadays our devices are not good enough to recognize a planet like earth. maybe later, by improving the space technology, an earth like planet will be discovered.

Answer 10

that really depends on the probability of there being intelligent life on other planets, and seeing as how we are the only intelligent species we're aware of so far, it'd be hard to say. and if there were intelligent life, they most certainly shouldn't bear any resemblance to our species. the human species if the culmination of Billions of years of happenstance and random cataclysms. The odds of a species emerging identical to our own is astronomical even by astronomic standards.

Answer 11

Hi, good question. you know there are too many planets in the gala xi that we are far from them then we can not searching about them well.but till now no planet find like earth i mean has survive thing but i am not sure that only earth.