Astronomy and Light Concepts

Front

Globular cluster

Back

A spherical collection of stars that orbits a galactic core as a satellite.

Front

Phases of the Moon

Back

The various stages of the Moon's appearance, such as New Moon and Waxing Crescent.

Front

Specular reflection

Back

Reflection of light in a single direction, also known as "scattering."

Front

Diffuse reflection

Back

Reflection of light in multiple directions.

Front

Retroreflector

Back

A device or surface that reflects light back to its source with minimal scattering.

Front

Units of angle measurement

Back

Degrees, arcmin, arcsec, and radians.

Front

Angular diameter

Back

The apparent size of an object in the sky, measured as an angle.

Front

Dark side of the Moon

Back

The side of the Moon that is not visible from Earth.

Front

Small-angle formula

Back

Theta = D ÷ d

• θ is the angular size in radians,

• D is the actual size of the object,

• d is the distance to the object

Front

Refraction

Back

The bending of light as it passes through different mediums.