Astronomy

Astronomy

The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.

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Astronomy > Planetary science

iron

Astronomy; Planetary science

An element with atomic number 26; symbol: Fe. Iron is one of the most abundant elements in the rocky planets. It is the most abundant element in the metallic cores of the inner ...

spinel

Astronomy; Planetary science

MgAl 2 O 4 , magnesium aluminum oxide mineral, with Cr able to substitute for Al.

pyroclastic eruption

Astronomy; Planetary science

Explosive eruption of lava producing and ejecting hot fragments of rock and lava.

secondary ion mass spectrometry (SIMS)

Astronomy; Planetary science

A precision measurement technique used to quantitatively analyze the elements and isotopes of materials at microscopic scales (with a typical spatial resolution of 1 micrometer). ...

Pre-Nectarian

Astronomy; Planetary science

The geologic history of Earth's Moon has been divided into five broad time periods, or systems. From oldest to youngest, these are pre-Nectarian, Nectarian, Imbrian, ...

Planck's constant

Astronomy; Planetary science

A constant value: 6. 626x10 -27 erg-seconds.

Noachian Epoch

Astronomy; Planetary science

The geologic history of Mars has been divided into three broad time periods, or Epochs. From oldest to youngest, these are Noachian, Hesperian, and Amazonian (named after places ...