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In the night sky: Orion
In the night sky: Orion

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Sunday, 3 Jul 2022, 19:07
Site: Open Learning
Course: In the night sky: Orion (INS_1)
Glossary: Orion Glossary
A

accretion disc

A flow of matter that is largely confined to a plane and that is spiralling in towards a central object.

angular size

The angle between two lines drawn from an observer’s eye to opposite sides of the object being observed.

asteroid

A body made of mainly rocky materials (including metals) in orbit around the Sun, that is typically much less massive than a planet. Most asteroids are found in the asteroid belt between Mars and Jupiter. Asteroids (and comets) are often called minor planets. The largest known asteroid (Ceres) is classified as a dwarf planet.

asteroid belt

A region between Mars and Jupiter in which most asteroids reside in stable orbits. Also called main belt.

Astrology

The study of the movements and relative positions of celestial bodies claimed as having an influence on human affairs and the natural  world. Astrology is not a science.

Astronomy

Astronomy is the scientific study of stars, space, and the physical universe as a whole.

atom

The building block of chemistry comprising a tiny, dense, positively charged atomic nucleus (which can contain both protons and neutrons) with circulating negatively charged electrons equal in number to the number of protons in the nucleus.