The Role of Multi-Messenger Astronomy in Extragalactic Astronomy

The study of astronomical phenomena using multiple types of messengers, such as electromagnetic radiation, gravitational waves, and neutrinos.

The study of astronomy using only one type of messenger, such as electromagnetic radiation.

The study of astronomy using only two types of messengers, such as electromagnetic radiation and gravitational waves.

The study of astronomy using only three types of messengers, such as electromagnetic radiation, gravitational waves, and neutrinos.