The B-V index is a color index that measures the difference between the brightness of a star in the blue (B) and visual (V) bands. It is used to classify stars and estimate their surface temperature.
Photometry is the science of measuring the flux or intensity of light emitted by celestial objects, typically stars, galaxies, and other astronomical objects.
Spectral type is a classification system that categorizes stars based on their temperature and spectral characteristics. The main types are O, B, A, F, G, K, and M, ranging from hot to cool stars.
Variable stars are stars whose brightness changes over time. This can occur due to intrinsic factors like pulsation or extrinsic factors like eclipses by another object.
Spectroscopy is the study of the interaction of light with matter. In astronomy, it is used to analyze the light from stars and galaxies to determine their composition, temperature, distance, and more.
Luminosity refers to the total amount of energy a star emits per second. It is often used to measure the intrinsic brightness of stars and other astronomical objects.
Stellar parallax is the apparent shift in the position of a star as observed from Earth due to the Earth's motion around the Sun. It is used to measure the distance to nearby stars.
Exoplanets are planets that orbit stars outside our Solar System. They can vary greatly in size, composition, and distance from their host stars.