system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is the new "earthlike planet" found by keplar a big deal?

Why is everybody get hyped because of this new discovery? we did already find some other earthlike planets without making a big deal out of it. whats different this time?
gpt
This planet is the closest "analog" to Earth we've ever discovered. We have certain ideas about what parameters are required for an earth-like planet that could support life as we know it. This includes the planet being just the right distance from its star to make the surface temps not too hot. 

In Kepler-452b's case, not only is the planet in this so-called "habitable zone", but Kepler-452 is very, very similar to the Sun in size, luminosity, etc. Kepler-452b's orbit is about 385 days, compared to 365 days in our own year. 

The most earth-like planet we've found to date is Kepler 438b, but it's star is a Red Dwarf, which is much smaller and cooler than the sun, and it's orbit is only about 35 days. 

It's possible that being in the habitable zone is all that matters for life, but finding an exoplanet that exists under conditions that are very, very, VERY close to earth's makes it an exceptionally good candidate for containing life. 

Now, all we need is for that planet to have formed the ability to transmit radio waves at least 1400 years ago so we can start getting confirmation that there's intelligent life on it.