NASA have revealed that they will be making a “big announcement” this Thursday at 4pm UTC regarding the exoplanet-hunting Kepler mission – and many believe the announcement will reveal the discovery of a second Earth-like planet (you can watch the announcement at the bottom of this page).
As previously reported, many people think NASA have already discovered a planet (by the name of Kepler-186f) that contains life, and speculate that this latest announcement will confirm the rumour that we are not alone in the Universe.
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Obviously let’s not get too excited just yet, because we’re far from having any concrete confirmation that such an announcement on the cards. But NASA did tease us with their press release. “Exoplanets, especially small Earth-size worlds, belonged within the realm of science fiction just 21 years ago,” they announced. “Today, and thousands of discoveries later, astronomers are on the cusp of finding something people have dreamed about for thousands of years – another Earth.”
It’s been 20 years since the first exoplanet orbiting another star similar to our Sun was discovered by Polish astronomer Aleksander Wolszczan. In 2009, NASA launched the Kepler spacecraft, with the sole mission of surveying our region of the Milky Way and looking for potentially habitable Earth-like planets. In the six years since, it’s found 1,028 exoplanets, and more than 20 of those have been classified as ‘potentially habitable’.
Of course, everything we know about these planets comes from the slight dimming of the light emitted by their home stars as the planets orbit in front of them. And they’re all hundreds, if not thousands, of light-years away, so we really have no way of knowing just how habitable they actually are. For example, Kepler 438b is our best shot at finding an Earth 2.0 right now, and it’s 1,100 light-years away, with only a 60 percent chance of being rocky. So we have a long way to go before we can pack up and move planets.
— NASA Kepler (@NASAKepler) July 21, 2015
But what Kepler is looking for are planets that are half to twice the size of Earth that are located in the ‘Goldilocks Zone’ of habitability. That means that the planet isn’t so close to its star that any liquid water would have evaporated, but it’s not so far away that it would have frozen solid. Ideally, we need something like Earth, that’s just right.
And maybe NASA is about to tell us we’ve done just that. Okay, who are we kidding? We can’t help but get excited. You can watch the briefing live here on Thursday, at 4pm UTC (9am PDT on Thursday or 2am AEST on Friday):
It will involve:
- John Grunsfeld, associate administrator for NASA’s Science Mission Directorate in Washington
- Jon Jenkins, Kepler data analysis lead at NASA’s Ames Research Centre in Moffett Field, California
- Jeff Coughlin, Kepler research scientist at SETI Institute in Mountain View, California
- Didier Queloz, professor of astrophysics at Cambridge University, United Kingdom
Oh, and while you’re waiting for the announcement, check out this illustrated guide of some of our potential future homes, via the Planetary Habitability Laboratory: