Month: July 2025

NEWTON’S LAWS OF MOTION
Three fundamental laws that describe the relationship between the motion of an object and the forces acting on it.

KEPLER’S LAWS
Three laws describing planetary motion around the Sun.

COSMOLOGY
The study of the origins, evolution, and structure of the universe.

DARK MATTER
A hypothetical form of matter that does not emit light but has gravitational effects.

GRAVITATIONAL LENSING
The bending of light by massive objects, predicted by Einstein’s General Relativity.

PARSEC
A unit of distance equal to 3.26 light-years, used in astronomy.

LIGHT-YEAR
The distance light travels in one year, about 5.88 trillion miles (9.46 trillion km).

ASTRONOMICAL UNIT (AU)
The average distance between Earth and the Sun, about 93 million miles (150 million km).

DOPPLER EFFECT
The change in frequency of waves due to the motion of the source relative to the observer.

REDSHIFT
The stretching of light waves due to an object moving away, supporting the expansion of the universe.