Month: July 2025

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.

SPECTROSCOPY
The study of the interaction between light and matter, used to determine the composition of celestial objects.

PARALLAX
The apparent shift of an object when viewed from different perspectives, used in astronomy to measure distances.

OCCAM’S RAZOR
The principle that simpler explanations are generally preferable to more complex ones.