Question

astronomers use em waves to study stars and galaxies that are billions of light - years away. which type of wave allows them to observe objects far beyond visible light? x - rays, radio waves, and infrared waves only visible light microwaves only gamma rays only

Explanation:

Astronomers use various electromagnetic (EM) waves. Visible light is just a small part of the EM spectrum. X - rays, radio waves, and infrared waves are also part of the EM spectrum. Radio waves can penetrate dust clouds in space. Infrared waves can detect cooler objects (like protostars) that are not hot enough to emit much visible light. X - rays can be used to study high - energy phenomena in space (such as from black holes or supernovae remnants). Microwaves (e.g., cosmic microwave background) and gamma rays (from very high - energy events) are also used, but the option with X - rays, radio waves, and infrared waves is more comprehensive for observing a wide range of objects beyond what visible light alone can show.

Answer:

X - rays, radio waves, and infrared waves