7 Terms
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Planetary science
The scientific study of planets including Earth, moons, and planetary systems of the Solar System in particular and the processes that form them.
Industry: Astronomy
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Planetary science
Long-period
Astronomy; Planetary science
In astronomy, a comet with an orbital period greater than 200 years.
Standard mean ocean water (SMOW)
Astronomy; Planetary science
A precise definition of the isotopic composition of water on Earth. It serves as a reference standard for comparing hydrogen and oxygen isotope ratios. For example, cosmochemists measure the 17 O / ...
Sheet silicates
Astronomy; Planetary science
These minerals have layered structures that contain silicon and oxygen in some multiple of Si 2 O 5 .
Celestial equator
Astronomy; Planetary science
An imaginary great circle in the sky drawn concentric to the Earth's equator.
Magnitude
Astronomy; Planetary science
Astronomical brightness measured on a logarithmic scale, based on the ancient practise of noting that the brightest stars in the sky were of "first importance" or "first magnitude", the next ...
Core
Astronomy; Planetary science
The central region of a planet or moon frequently made of denser materials than the surrounding regions (mantle and crust). Earth and the Moon are thought to have cores of iron and nickel.
Phyllosilicates
Astronomy; Planetary science
These minerals have layered structures that contain silicon and oxygen in some multiple of Si 2 O 5 .
