Earth 2.0 could be just 4.4 light-years away Watch

alberto91
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Alpha centauri could host the closest Earth-like planet.

A study shows that 22% of G and K-type stars could have Earth-like planets orbiting in the habitable zone.

There are 9 Sun-like stars within 25 light-years. If we make the calculation, two of those stars could have an Earth-like planet.

One of those two exoplanets could be Tau Ceti e. Which exoplanet could be the other one?

7 out of the 9 closest Sun-like stars have low metallicity. The only two stars with high metallicity are Alpha Centauri A and Delta Pavonis, but this star is suspected to be variable.

What do you guys think?

Sources:
https://youtu.be/MEou5_yTxus
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Rakas21
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Yes, the fact that we have found thousands of planets over the last decade is among the greatest scientific discoveries of the century. We have gone from the position in the 1960’s where it was thought that our solar system was a rarity and that there might only be 10,000 planets to finding out that almost all solar systems have planets and that the number of earth like planets in our galaxy likely numbers in the tens of billions.

With 1700 k, g and f type stars within 100 light years it is likely that life exists on several worlds. When you add in the red dwarfs and moons which may be habitable in parts but are unlikely to have produced life then our interstellar discoveries this century are significant.
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quasa
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how long will it take to develop ftl transport:holmes:
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Rakas21
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(Original post by quasa)
how long will it take to develop ftl transport:holmes:
At least a century without a radical scientific breakthrough.

On current pace there is a chance that fusion could get a probe to the Cenuari system around the end off the century (assuming ITER works and can be made smaller). That probe would take about 40 years to arrive though since fusion could only get to about 10% of light speed.
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DiddyDecAlt
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Just 4.4 light years. How long would it take us to get there with our current technology?
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Rakas21
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(Original post by DiddyDecAlt)
Just 4.4 light years. How long would it take us to get there with our current technology?
Assuming we could make one of experimental ion engines work for long enough we can travel about 0.3% of the speed of light so about 1500 years if we aim it correctly.

If we wait for fusion which looks feasible mid-century and assume we can make a version small enough then we can get about 10% of the speed of light which would be a little over 40.

Because we can identify planets and send communications far faster it's likely we will be telling aliens to come here long before we have the ability to go on our jollies any further than the moon's of Saturn.
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username5049966
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(Original post by DiddyDecAlt)
Just 4.4 light years. How long would it take us to get there with our current technology?
Well our very oldest cities are about 10,000 years old. With our very fastest probes it would take about 7-8 times as long if they were going in the right direction which they're not. Theoretically it could be cut down to a lot shorter times but it would have to be using an entirely new type of rocket.
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Rock Fan
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How long before our government sends money up there
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username5049966
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(Original post by Rock Fan)
How long before our government sends money up there
You know not everything is about money.
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