A Quote by Dimitar Sasselov

Ocean planets might be very common in the universe because water is very common in the low-temperature environments where planets form and evolve. This might be especially true for super-Earths, which can retain volatiles more easily thanks to their larger mass and surface gravity.
A major puzzle for which nobody has an answer is this: is there some size at which the planets change their nature from water-rich planets like Neptune, to rocky planets like the Earth? We have found two planets that are the size of the Earth in radius, but they are very close to their host star, so water on the surface would evaporate away.
Super-Earths are how we call a family of planets... up to two times larger and about ten times more massive than the Earth.
The universe has told us the most common types of planets are small planets, and our study shows these are exactly the ones that are most likely to be orbiting Alpha Centauri A and B.
We're just learning that a lot of planets are small planets, and we didn't know that before, fact is, in planetary science, objects such as Pluto and the other dwarf planets in the Kuiper Belt are considered planets and called planets in everyday discourse in scientific meetings.
A 'serious' scientist in 1992 or 1993 had to admit the possibility that planets were really rare, that most stars might not have planets. We've gone from there to here - where most stars have planets.
In space there are countless constellations, suns and planets; we see only the suns because they give light; the planets remain invisible, for they are small and dark. There are also numberless earths circling around their suns.
We know there are billions of stars and planets literally out there, and the universe is getting bigger. We know from our fancy telescopes that just in the last two years more than 20 planets have been identified outside our solar system that seem to be far enough away from their suns - - and dense enough - - that they might be able to support some form of life. So it makes it increasing less likely that we're alone. But if we were visited someday, I wouldn't be surprised.
I don't view the fans in the way that most performers do. As a mass of people who have paid money, I know what they want. It's a very, very, very, very, very low common denominator.
Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion.
The mass starts into a million suns; Earths round each sun with quick explosions burst, And second planets issue from the first.
Understanding different planets in their environments is still really important. So if these planets are dead lifeless worlds, it will still be useful for us.
We are the laws of chemistry and physics as they have played out here on Earth, and we are now learning that planets are as common as stars. Most stars, as it turns out now, will have planets.
It is a matter of common knowledge among mystics that the evolutionary career of mankind is indissolubly bound up with the divine hierarchies, who rule the planets and the signs of the Zodiac, and that the passage of the Sun and the planets through the twelve signs of the Zodiac, marks man's progress in time and in space.
God created the universe in such a manner that all in common might derive their food from it, and that the Earth should also be a property common to all.
We have stars, planets and galaxies in space. There's lots of nothingness out there, but it's really not. There's gas, dust and other bits of matter floating around emptier' areas of the universe, but you can't see it very easily.
People think that alien spaceships would be solid and made of metal and have lights all over them and move slowly through the sky because that is how we would build a spaceship if we were able to build one that big. But aliens, if they exist, would probably be very different from us. They might look like big slugs, or be flat like reflections. Or they might be bigger than planets. Or they might not have bodies at all. They might just be information, like in a computer. And their spaceships might look like clouds, or be made up of unconnected objects like dust or leaves.
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