The inner planets
, Mercury and Venus, go through a complete cycle of phases like the Moon.
Kepler detected the planets while monitoring light from this Sun-like star, catching 18 transits of the inner planet
and 3 transits of the outer world.
It's no accident that these hypotheses represent more extreme versions of the inner planets
in our solar system, because they're the only things we know.
Simulations show that outer planets with such a trajectory are conducive to the survival of inner planets
that could harbor life.
Asteroids (minor planets in the inner solar system) are the bits and pieces left over after the formation of the inner planets
, including the Earth.
Caption: Bob made a sphere-cutting tool for his lathe so he could make the inner planets
The astronomers studied levels of UV radiation emitted by Trappist-1 which suggest its inner planets
could have lost 20 times more water in the last eight billion years than all the Earth's oceans combined.
On the two inner planets
, a year lasts just a couple of days.
In our solar system there are many comets that spend a lot of their time among the inner planets
, Venus, Earth and Mars.
Expanding outwards into the solar system, it will consume most of the inner planets
(including the Earth).
Jupiter may have swept through the early solar system like a wrecking ball, destroying a first generation of inner planets
before retreating into its current orbit, according to a study from the University of California, Santa Cruz.