Which description correctly explains how radiation travels from the Sun to the Earth?

Which description correctly explains how radiation travels from the Sun to the Earth?

• A. Through space without needing a medium
• B. Only through air
• C. Only through water
• D. Only through solids

Answer: (A)

Radiation can travel through empty space because electromagnetic waves don’t need a medium to propagate. The Sun emits energy as light and other wavelengths that move through space as oscillating electric and magnetic fields. Since space is a vacuum, no air, water, or solids are required for these waves to reach Earth. That’s why sunlight can travel the vast distance to our planet even though there’s nothing between them. When the radiation reaches Earth, some is reflected or absorbed by the atmosphere and surface, but the travel itself did not depend on a medium.

Radiation can travel through empty space because electromagnetic waves don’t need a medium to propagate. The Sun emits energy as light and other wavelengths that move through space as oscillating electric and magnetic fields. Since space is a vacuum, no air, water, or solids are required for these waves to reach Earth. That’s why sunlight can travel the vast distance to our planet even though there’s nothing between them. When the radiation reaches Earth, some is reflected or absorbed by the atmosphere and surface, but the travel itself did not depend on a medium.