Radio waves have the longest wavelengths in the electromagnetic spectrum, ranging from a few millimeters to kilometers.

The hottest stars emit X-rays due to their extremely high temperatures.

Visible light is used to study the composition of stars through spectroscopy, which analyzes the absorption and emission lines in their spectra.

Visible light is the primary source of energy for photosynthesis in plants, which convert it into chemical energy through the process of photosynthesis.

X-rays are used to detect black holes by observing the X-ray emissions from the accretion disk surrounding them.

The Spitzer Space Telescope is a space telescope designed to observe the universe in the infrared region of the electromagnetic spectrum.

Radio waves are used to study the cosmic microwave background radiation, which is the leftover radiation from the Big Bang.

The Fermi Gamma-ray Space Telescope is a space telescope designed to observe the universe in the gamma-ray region of the electromagnetic spectrum.

Radio waves are used to study the structure and dynamics of galaxies by observing the emission from neutral hydrogen gas.

The Galaxy Evolution Explorer is a space telescope designed to observe the universe in the ultraviolet region of the electromagnetic spectrum.

Infrared radiation is used to study the formation and evolution of stars by observing the emission from dust and gas in star-forming regions.

The Chandra X-ray Observatory is a space telescope designed to observe the universe in the X-ray region of the electromagnetic spectrum.

Radio waves are used to study the properties of interstellar gas and dust by observing the emission from molecules and atoms in these regions.

The Hubble Space Telescope is a space telescope designed to observe the universe in the visible light region of the electromagnetic spectrum.

X-rays are used to study the properties of black holes by observing the emission from the accretion disk surrounding them.