Absorptions

Acceleration

Acceleration of gravity

Angular Momentum

Angular Resolution

Astronomical Units

Atomic Mass Numbers

Atomic Number

Atomic structure

Continuum

Declination

The Difference between mass and weight

Doppler Effect

Emission

Frequency

Gravitational Field

Hypothesis

Isotopes

Kinetic energy

Kepler's first law

Kepler's Second Law

Kepler's Third Law

Latitude

Law of Energy Conservation

Law of conservation of angular momentum

Light-year

Longitude

Mass-energy

Momentum

Observation

Potential Energy

Radiative Energy

Reflecting Telescope

Refracting Telescopes

Rest-energy

Retrograde Motion

Right Ascension

Spectral Lines

Speed

Stellar Parallax

Velocity

Wavelength

Weightlessness

Newton

Newton's First Law of Motion

Newton's Second Law of Motion

Newton's Third Law of Motion

Summer (Northern Hemisphere)

Summer Solstice

Winter (Southern hemisphere)

vernal equinox

autumnal equinox