Huffington Post reported Tuesday that on "Aliens: A Definitive Guide", scientists say that even without definitive evidence, there is no "no doubt" there are life forms living beyond Earth.
During the "Are We Alone?" series that is being aired on the Science Channel all month long, theoretical scientist Michael Kaku says he believes there are extraterrestrial life forms living among us.
"Some scientists say that perhaps we are the only life forms in the universe. Give me a break! I mean, how many stars are there out there in the universe, anyway? The Hubble Space Telescope can see about a hundred billion galaxies -- that's the visible universe."
In recent years, scientists have discovered a plethora of planets in neighboring galaxies. Perhaps at least 50 percent of those stars harbor planets. Seth Shostak, a senior astronomer at the SETI Institute, estimates there are 1 trillion planets in the Milky Way alone.
Although scientists have no idea what ET life forms look like, they are certain that they exist. One possibility is in the water planets, where the planets are mostly oceans several kilometers deep.
Scientists estimate that planet Earth is about 4.5 billion years old. The earliest evidence for life comes from 3.4 billion-year-old mats of bacteria called stromatolites in Australia. How long the life forms have been around on other planets and how intelligent they may be are two other important questions that are yet to be answered.
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