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www.nap.edu/read/9839/chapter/10

ASTRONOMICAL TERMS. Accretion, accretion disk—Astronomical objects as ... The Advanced Solar Telescope; also, the NSF's Division of Astronomical Sciences.

hubblesite.org/glossary

A space-based X-ray observatory; also known as the Advanced X-ray ... In astronomy, this term is often used to describe the rate at which light flows.

cds.cern.ch/record/1339503/files/978-0-387-33228-4_BookBackMatter.pdf

One of the aims of astrophysics is to understand such differences, perhaps in terms of the history of the Solar System. Besides the nine planets we have listed, ...

www.ats-group.net/glossaries/glossary-lexicon-astronomy.html

Astronomy Dictionary Astronomy glossary explains basic astronomical terms. The Astronomy Thesaurus Astronomy Thesaurus in French, Spanish and Italian.

solarviews.com/eng/terms.htm

Glossary of space and planetary related terms. ... astronomical unit (AU): The average distance from the Earth to the Sun; 1 AU is 149,597,870 kilometers ...

www.space.com/57-stars-formation-classification-and-constellations.html

Jul 19, 2017 ... There have been, of course, more advanced observatories (in all ... Astronomers describe star brightness in terms of magnitude and ...

chandra.harvard.edu/resources/glossaryA.html

May 11, 2011 ... Illustrations and other multimedia focusing on the Chandra mission, X-ray astronomy and Chandra peopleas well as a glossary of terms, ...

openstax.org/books/astronomy/pages/2-key-terms

accelerate: to change velocity; to speed up, slow down, or change direction. · apparent magnitude: a measure of how bright a star looks in the sky; the larger ...

www.britannica.com/science/nadir

Nadir is a term used in astronomy for the point in the heavens exactly opposite to the zenith, the zenith and nadir being the two poles of the horizon.

www.nasa.gov/pdf/58277main_Space.Based.Astronomy.pdf

other words, astronomy meant the study of anything beyond Earth. Although still an applicable term ... is to identify and test advanced technologies that.

skyandtelescope.org/astronomy-terms

Astronomy Terms · Angular Size and Distance The apparent size of an object in the sky, or the distance between two objects, measured as an angle. · Aperture