The first extrasolar planets that were found were called Hot Jupiters. They were basically Jupiter-sized planets very close to the stars - their orbits were only a few days. They are thought to have formed farther out from the star and then moved inwards. When a star is young, it has a gas disk - interactions between the disk and the planet cause the planet to spiral inwards (it's kind of like a frictional interaction). The disk doesn't go all the way to the star, just close, so the planet doesn't get eaten up by the star. When the star gets older, the disk goes away.
Most of the first planets found were like this because they were the easiest to find: massive, short period planets were favored by the detection techniques. Since then we've discovered thousands of planets and solar systems similar to ours are much more common.
As far as the atmospheres part, atmospheres are complicated. It kind of makes sense that our atmosphere is like it is, but I wouldn't say it has to be like that.
Just a side note: the first extrasolar planet was discovered in 1995 - not that long ago. The field has progressed incredibly in that time. The Kepler mission, which sadly is likely to end any day now (out of fuel), found thousands of planets and TESS, which just launched, will find lots more.
I'd like to ask you something if I may. I learned in college that the inner planets had to be stony planets with the first one with atmosphere being right where earth is (I think) and the outer planets had to be the gas giants. Then the new solar systems were found and they all had the gas giants right up next to the star. Right?
Well, it's added to my wish list, and I'm gonna drop a hint or two at the library. From the description it looks to answer questions about the place I didn't even know to ask!
Honestly, I'd be surprised if I'm told when its coming out. Amazon says 12/31/18. In the academic world, you don't even get paid for these things. They're going to send me one free copy. (Note: I'm not really in science any more, partly because of things like this. I do a little bit of science, but mostly I have a real job.)
The first extrasolar planets that were found were called Hot Jupiters. They were basically Jupiter-sized planets very close to the stars - their orbits were only a few days. They are thought to have formed farther out from the star and then moved inwards. When a star is young, it has a gas disk - interactions between the disk and the planet cause the planet to spiral inwards (it's kind of like a frictional interaction). The disk doesn't go all the way to the star, just close, so the planet doesn't get eaten up by the star. When the star gets older, the disk goes away.
Most of the first planets found were like this because they were the easiest to find: massive, short period planets were favored by the detection techniques. Since then we've discovered thousands of planets and solar systems similar to ours are much more common.
As far as the atmospheres part, atmospheres are complicated. It kind of makes sense that our atmosphere is like it is, but I wouldn't say it has to be like that.
Just a side note: the first extrasolar planet was discovered in 1995 - not that long ago. The field has progressed incredibly in that time. The Kepler mission, which sadly is likely to end any day now (out of fuel), found thousands of planets and TESS, which just launched, will find lots more.
No no!
He knows you're not that good a person. Because of the way you go around enjoying yourself.
I'd like to ask you something if I may. I learned in college that the inner planets had to be stony planets with the first one with atmosphere being right where earth is (I think) and the outer planets had to be the gas giants. Then the new solar systems were found and they all had the gas giants right up next to the star. Right?
Well, it's added to my wish list, and I'm gonna drop a hint or two at the library. From the description it looks to answer questions about the place I didn't even know to ask!
Link: https://www.amazon.com/Merc...
Honestly, I'd be surprised if I'm told when its coming out. Amazon says 12/31/18. In the academic world, you don't even get paid for these things. They're going to send me one free copy. (Note: I'm not really in science any more, partly because of things like this. I do a little bit of science, but mostly I have a real job.)
Rather like lions and tigers.
When did Victoria put in lights?
This time for sure! Presto!
You're gonna tell us when it comes out, right?
I love it when someone takes the time to spin this joke.
Shh, don't tell Dok, he'll be jealous.
No idea why, but for some reason it is ALWAYS cloudy where I am when the Perseids come by. What are you hiding from me, Mother Nature?
This is a much better reason
When did I state that Israel can do no wrong?
The country has serious, serious issues.
But I don't for a second believe they are evil. Except for maybe some of the ultra-Orthodox: they make me embarrassed to be share the same religion.