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Å

Å   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Symbol for *angstrom.

A-OK

A-OK   Quick reference

A Dictionary of Space Exploration (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

‘Very OK’ or ‘Great’. John ‘Shorty’ Powers, NASA's public-relations officer, introduced the term by misquoting astronaut Alan *Shepard during the first sub-orbital flight in ...

A-type asteroid

A-type asteroid   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

A rare type of asteroid that has both a moderately high albedo (0.13–0.35) and an extremely reddish spectrum at wavelengths shorter than 0.7 ...

A-type rocket

A-type rocket   Quick reference

A Dictionary of Space Exploration (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

A name used in the West for a series of Soviet rocket boosters. The A-1 launched *Sputnik and the cosmonaut ...

AAO

AAO   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *Australian Astronomical Observatory.

AAS

AAS   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *American Astronomical Society.

AAT

AAT   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *Anglo-Australian Telescope.

AAVSO

AAVSO   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

Abbr. for *American Association of Variable Star Observers.

A band

A band   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018
A broad *Fraunhofer line in the Sun’s spectrum at around 759 nm, due to absorption by oxygen in the Earth’s atmosphere. Because the oxygen is in molecular form, the A band is actually a ... More
Abell clusters

Abell clusters   Reference library

The Oxford Companion to Cosmology

Reference type:
Subject Reference
Current Version:
2008

George Abell is best remembered for his catalogue of clusters of galaxies, a result of his PhD work at the

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