- ice
- used by planetary scientists to refer to water,
methane, and ammonia which usually occur as
solids in the outer solar system.
- inclination
- the inclination of a planet's orbit is the angle
between the plane of its orbit and the ecliptic;
the inclination of a moon's orbit is the angle
between the plane of its orbit and the plane of
its primary's equator.
- Inquisition, The
- A Renaissance Catholic court instituted to seek
out and prosecute heretics.
- inferior planets
- the planets Mercury
and Venus are
called inferior planets because their orbits are
closer to the Sun than is Earth's orbit.
- interplanetary magnetic field (IMF)
- the magnetic field carried with the solar wind.
- ionosphere
- a region of charged particles in a planet's upper
atmosphere; the part of the Earth's
atmosphere beginning at an altitude of about 25
miles and extending outward 250 miles or more.
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