Thanks to light, we know the history of the universe and the composition of distant celestial bodies

How do scientists study the universe when they don't set foot on it?

• 4 cosmic phenomena have the speed of traveling through the speed of light
• Discovering new gravitational waves from two black holes collides 3 billion light-years away

The answer is light. By observing and analyzing the light transmitted from the universe, scientists can know the structure, temperature, pressure, direction and speed of movement . of bodies away from Earth billions of years. the light. Light is the source of information to reveal the history of the universe.

Edwin Hubble, a physicist, American astronomer was the first to study light from distant galaxies.