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- [Instructor] You're probably familiar

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with the major types of
planets in our solar system.

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You know, there are some
smaller rocky planets

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and some giant gas planets.

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The rocky, or terrestrial
ones are closer to our star,

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the sun where it's much warmer,
while the giant gas planets

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are farther out in the cold.

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But what about other planet
systems we're finding out there

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among the stars?

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For the most part, they don't
look a whole lot like ours.

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Turns out, there doesn't seem
to be a typical arrangement

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for planetary systems.

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Yep, all planetary systems might be weird.

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Most other systems of planets

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are certainly arranged differently.

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Sure there are lots of
planets out there the size

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of Juipter and Neptune and Earth,

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but their Jupiters and
Neptunes can be way closer

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to their stars than ours.

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Some as close or closer
than the orbit of Mercury.

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So scientists who study these exo-planets,

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planets outside our solar
system, find themselves using

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terms like Hot Jupiters and warm Neptunes.

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Plus, there's a whole
range of exo-planet sizes

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from much smaller than Earth
to even bigger than Jupiter.

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To help describe what weight class each

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of these planets belong
to, we often refer back

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to the different planet
types in our solar system

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using terms like Mini Neptunes

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and Super-Earths or Super-Terrestrials.

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We're constantly learning
more about exo-planets

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and our ideas about them
are changing as we go,

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ideas about how these
different planet types relate

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to each other and what
their variety can teach us

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about our own weird little solar system.