You might have gazed at the skies pretty long and even have spotted weird objects. But you wouldn't have walked in space for even one day---at least so far. So are you to be believed?

Perhaps not. But you can go by the words of an astronaut who has spent 230 days out there---Leroy Chiao. As a commander of the International Space Station, he finished four missions in space and also went on six space walks in 15 years. He is an ex-NASA astronaut, and if he believes that there are aliens everywhere, all around the world, then is he right?

You bet he is.

You bet your sweet life he is. He predicts that if humans and aliens discover each other, they might even destroy us and our beloved planet.

Finding aliens doesn't bode too well, is what he thinks. While aliens, contrary to what scientists have to say, would not allow themselves to be discovered through the earth's scientific methods, he also explains that if we do discover them, by chance or by design, it would not lead to a good situation for the Earth.

He writes in space.com: "The possibility of extraterrestrial life has fascinated humans since our awareness that such a thing could exist, and with the recent discovery of a possibly Earth-like planet around a star in our cosmic backyard, tantalizing new questions are being raised about the possibility of finding life elsewhere in the universe."

"Moreover," he adds, "I believe that at some point, life on Earth will die out, either from natural causes, or from our own doing". Technology would be of no use to save us, as some have said.

However, why haven't we discovered any aliens so far, and why can't we talk to them? He says: "I believe that life is always starting in some parts of the universe at the same time that it is dying out in others. We don't know about each other, simply because the distances are so vast. We won't easily find evidence of alien life around another star, especially those that are hundreds of millions of light-years away, or more."

The planet that is most likely to host life would be Mars, with its warm temperature and water. Hence, "The discovery of incontrovertible evidence of past or present life on Mars would prove my theory on alien life. Lets continue to explore Mars, which is in our own 'backyard'," he offers.

Discovery of Proxima B, an exoplanet, seems to give some credence to the theory. "Measurements indicate that Proxima b is a rocky planet, just slightly larger than Earth, orbiting the star at the right distance to be able to support liquid water on its surface, and thus perhaps life," writes Chiao. However, the planet is different from the earth too. "The planet's orbital period is only 11 days, and it does not rotate on its own axis. Also, the radiation environment is estimated to be much harsher than that for Earth. Still, scientists say some kind of life count exists there."

However, Chiao isn't the only one who thinks we arent alone out there. In 2014 as scientists met with Congress, Seth Shostak, a senior astronomer at the California-based Search of Extraterrestrial Intelligence Institute told the U.S. said that "At least a half-dozen other worlds (besides Earth) that might have life are in our solar system."

"The chances of finding it, I think, are good, and if that happens, it'll happen in the next 20 years, depending on the financing, added Shostak."

YouTube/Strange Mysteries