he answer to the question if we are ready for space travels based on the present technology, the answer is a BIG NO. ​

If powerful governments like the U-S could announce they have invented transportation for space travels then that will be the right time we can say we are ready to migrate to other planets.

To consider things going on such as frequent discoveries of extrasolar planets or exoplanets and acceleration of technologies in propulsion system for space flight, i think we are in the right track to see the world beyond planet Earth.

Reports say there are more than 800 exoplanets discovered by the astronomers and some of them are considered to be candidates as Earth-like planets.

Just to give you an idea, what could be the potential exoplanets that could support life, here are the potentially habitable exoplanets based on the discoveries of the astronomers at the University of Puerto Rico at Arecibo's Planetary Habitability Laboratory.

1. Gliese 581g

This rocky world was announced in September 2010 and has been controversial ever since, with some researchers casting doubt on its existence and its discoverers remaining firmly behind their find. Gliese 581g, which is located just 20 light-years away, is likely two to three times as massive as Earth and zips around its parent star every 30 days or so. This orbit places the planet squarely in its star's "habitable zone" — that just-right range of distances where liquid water, and perhaps life as we know it, could exist.

2. Gliese 667Cc

Gliese 667Cc, which was discovered in February 2012 by the same core team that spotted Gliese 581g, orbits a red dwarf 22 light-years away, in the constellation Scorpius (The Scorpion). The alien world is a so-called "super Earth" that's at least 4.5 times as massive as our planet, and it completes an orbit every 28 days. At least one other planet circles the star Gliese 667C, which is part of a triple-star system.

3. Kepler-22b

Kepler-22b was spotted by NASA's planet-hunting Kepler space telescope in December 2011. It's a super Earth about 2.4 times as wide as our planet. If the greenhouse effect operates on Kepler-22b like it does on Earth, the alien world would have an average surface temperature of 72 degrees Fahrenheit (22 degrees Celsius), researchers have said. Kepler-22b is found about 600 light-years away, and it orbits a star very much like our own sun.

4. HD 85512b

HD 85512b is another super Earth, one that's thought to be 3.6 times as massive as our planet. The alien world is found about 35 light-years from us, in the direction of the constellation Vela (The Sail).

Astronomers announced the discovery of HD 85512b in September 2011. The planet's estimated surface temperature is 77 degrees Fahrenheit (25 degrees Celsius).

5. Gliese 581d

This world, which is about seven times as massive as Earth, orbits a bit farther out than its planetary sibling Gliese 581g.

When 581d was first discovered in 2007, many scientists regarded it as too cold to be potentially habitable. In the years since, however, atmospheric-modeling studies have suggested that the planet may indeed be able to support life as we know it — provided 581d is warmed by a greenhouse effect.

6.  UCF-1.01, is not very hospitable, with temperatures that exceed 1,000 degrees Fahrenheit, a surface that may be volcanic or molten and little if any atmosphere. For UCF-1.01, it's a way of life. The planet is located so close to its parent star, a red dwarf known as GJ 436, that it completes an orbit in 1.4 Earth days.

Well, at least for now we know scientists of this planet are doing their very best to explore the vastness nof the Universe.

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