Light can travel through the vacuum of space.

Light can travel through the vacuum of space.

• A. False
• B. Sometimes
• C. True
• D. Not at all

Answer: (C)

Light is an electromagnetic wave that can travel even where there is nothing—empty space. In vacuum there is no medium to carry it, yet changing electric and magnetic fields support each other and transfer energy through space at the speed of light. That speed is about 300,000 kilometers per second and is a fundamental limit for how fast information and energy can move. This is why light from stars and the Sun reaches us across billions of kilometers, and why light can travel through space without needing air or another substance. The other options would imply that light needs something to move through or that it never moves at all, which contradicts how electromagnetic radiation behaves in space. In mediums like air or water, light can slow down or bend, but in vacuum it travels unimpeded at the constant speed c.

Light is an electromagnetic wave that can travel even where there is nothing—empty space. In vacuum there is no medium to carry it, yet changing electric and magnetic fields support each other and transfer energy through space at the speed of light. That speed is about 300,000 kilometers per second and is a fundamental limit for how fast information and energy can move. This is why light from stars and the Sun reaches us across billions of kilometers, and why light can travel through space without needing air or another substance. The other options would imply that light needs something to move through or that it never moves at all, which contradicts how electromagnetic radiation behaves in space. In mediums like air or water, light can slow down or bend, but in vacuum it travels unimpeded at the constant speed c.