Final answer:
The main-sequence stage has the biggest absolute magnitude among stars.
Step-by-step explanation:
The Absolute Magnitude of Stars
The absolute magnitude of a star is a measure of its brightness as seen from a distance of 10 parsecs (about 32.6 light-years) away. It is a way to compare the true brightness of stars, regardless of their distance from Earth. The absolute magnitude is usually denoted as M, and it is determined based on the star's apparent magnitude (m) and its distance from Earth (d).
The stage that has the biggest absolute magnitude is the main-sequence stage. Main-sequence stars, also known as dwarf stars, are stars that are still burning hydrogen in their cores. They have a wide range of absolute magnitudes, with more massive stars having higher absolute magnitudes. For example, the absolute magnitude of the Sun is around 4.83, while more massive stars like Betelgeuse have absolute magnitudes of -6.0 or lower.
It's important to note that the absolute magnitude of a star does not directly correspond to its apparent brightness in the night sky. The apparent brightness depends not only on the absolute magnitude but also on the star's distance from Earth.