Every day Earth gets a little more crowded. More and more people are born. Our air becomes a little less clean. More and more cars let out gases. Every day we use up our resources. We chop down trees and use fresh water. Every day, it becomes a little harder to live on Earth. This may feel a little sad. However, every day, scientists are searching space for planets that are just like ours. They're looking for new chances, fresh starts. Sometimes they find them.
What makes a planet like Earth? Earth is different from most in that it sits just far away enough from the sun, but not too far. The Goldilocks zone
is the ring around the sun that isn't close enough to be too hot for life and isn't far enough to be too cold for life. Planets can be too hot, too cold, or just right. While Venus is much too hot and Mars is much too cold, Earth is in the spot that is just right.
We need more than just the right weather to live on Earth. Earth's turning center makes a shield that blocks the sun's rays from cooking us. The shifting plates push new earth up and pull old earth down to be used again. Earth is also small enough to be rocky so we do not fall through it like we would on a bigger gas planet. Ideal conditions
are the best set of things for life like us to live. If the planet we find is enough like Earth, if it blocks the sun, if it makes new land, if it's made of rock, then we might be able to live on it. Now it's just a matter of getting there . . .
Under ideal conditions I just go to the beach.
We do not find planets like Earth very often. In 2013, we only found three. These are so far away that we cannot tell what's happening on them. A light year
is how far light, the fastest thing we know about, can go in one year. The closest Earth-like planet is at least 6-7 light years away. That may seem like good news "" it's only 7 light years away! But there's one little problem. We are not made of light! We don't travel that fast.
I'm going to need a faster space ship if I want to travel to another planet.
So if the planets we might be able to live on are too far away for us to even see, why are we making such a big deal about finding them? As it becomes more crowded and harder to breathe here on Earth, we might someday have to try and reach a new place where we can live. Who knows? Your children's children's children's children might be able to find a way to get there. People may have to spend two or three lifetimes on a spaceship,. though. Tell me. Would you live on a spaceship to save everyone on Earth?
NPR. "Scientists Estimate 20 Billion Earth-Like Planets In Our Galaxy" NPR, 2013. < http://www.npr.org/blogs/thetwo-way/2013/11/04/243062655/scientists-estimate-20-billion-earth-like-planets-in-our-galaxy>
Health and Science. "Kepler space telescope finds, Earth-size, potentially habitable planets are common" Washington Post, 2013. <http://www.washingtonpost.com/national/health-science/kepler-space-telescope-finds-earth-size-potentially-habitable-planets-are-common/2013/11/04/49d782b4-4555-11e3-bf0c-cebf37c6f484_story.html>
New Scientist. "Closest Earth-like planet may be half as far as previously thought" New Scientist, 2013. <http://www.rawstory.com/rs/2013/03/13/closest-earth-like-planet-may-be-half-as-far-as-previously-thought/>