Do you believe in life on other planets?

for example mars:

Scientists have long speculated about the possibility of life on Mars owing to the planet's proximity and similarity to Earth. It remains an open question whether life exists on Mars now, or existed there in the past.

[edit] Early speculation

Mars's polar ice caps were observed as early as the mid-17th century, and they were first proven to grow and shrink alternately, in the summer and winter of each hemisphere, by William Herschel in the latter part of the 18th century. By the mid-19th century, astronomers knew that Mars had certain other similarities to Earth, for example that the length of a day on Mars was almost the same as a day on Earth. They also knew that its axial tilt was similar to Earth's, which meant it experienced seasons just as Earth does - but of nearly double the length owing to its much longer year. These observations led to the increase in speculation that the darker albedo features were water, and brighter ones were land. It was therefore natural to suppose that Mars may be inhabited by some form of life.

In 1854, William Whewell, a fellow of Trinity College, Cambridge, who popularized the word scientist, theorized that Mars had seas, land and possibly life forms. Speculation about life on Mars exploded in the late 19th century, following telescopic observation by some observers of apparent canals — which were however soon found to be optical illusions. Despite this, in 1895, American astronomer Percival Lowell published his book Mars, followed by Mars and its Canals in 1906, proposing that the canals were the work of a long-gone civilization. This idea led British writer H. G. Wells to write The War of the Worlds in 1897, telling of an invasion by aliens from Mars who were fleeing the planet’s desiccation.

Spectroscopic analysis of Mars' atmosphere began in earnest in 1894, when U.S. astronomer William Wallace Campbell showed that neither water nor oxygen were present in the Martian atmosphere[1] . By 1909 better telescopes and the best perihelic opposition of Mars since 1877 conclusively put an end to the canal theory.The photographs taken by the Mariner 4 probe in 1965, showed an arid Mars without rivers, oceans or any signs of life. Further it revealed that the surface (at least the parts that it photographed) was covered in craters, indicating a lack of plate tectonics and weathering of any kind for the last 4 billion years. The probe also found that Mars had no protective magnetic field, meaning that intense UV radiation makes the planet extremely hostile to life as we know it. The probe was also able to calculate the atmospheric pressure on the planet to be between 4 and 7 millibars, meaning that liquid water could not exist on the planet's surface[1]. After Mariner 4, the search for life on Mars changed to a search for bacteria-like living organisms rather than for multicellular organisms, as the environment was clearly too harsh for these.

Yes, to think that we're the only lifeform in the Universe is almost absurd. Has other life visited us? I don't think so. First, we're way off in the edge of our galaxy. If another life form was anxious to make first contact they would head to a crowded region of the galaxy first. Remember the galaxy is really, really big.

The same way if you were visiting a planet for the first time looking for cities. You would look near the rivers, particularly where they flow into the oceans. Not at the tops of the highest mountains or the middle of deserts. That's where we are.

More likely UFOs (if they exist at all) would be time travelers from our future. In other words, us.

When supernovas explode nebulas are formed. Scientists believe that nebulas are the birthplace of planets stars and life itself. All the elements necessary for life like carbon, nitrogen, etc are found in nebulas. There might be a star born out of those nebulas just like our sun, and planets as well, give it a perfect location and an atmosphere suitable for life and eventually simple organisms will evolve. The law of natural selection will take its course. There might even be beings out there more intelligent than us humans given the almost perfect balance of all the elements for life to thrive.

yes i believe in that

like our solar system there are many other solar systems which may be several light years away from ours.depending upon the sun or star the third planet or fourth planet may develop favourable conditions for life to exist.

Considering how readily life forms from basic compounds that litter space, I consider it likely that other planets have at least bacterial life.

To think that we're the only inteligent life in this whole universe is just odd to me. I'm sure there is other life, in different forms, that we might not even realize.

I believe that there are other planets out there much like our own.

I have experienced life on other planets.

Its possible