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It's Okay to Be Smart: Sunlight Is Way Older Than You Think. Here’s Why…

8 minutes 23 seconds

Now Playing As: Captioned (English) (change)

If the sun instantly switched off like a light bulb, it would take almost 8 and a half minutes before humans on Earth realized what happened. Light travels at the fastest speed there is, but it still takes almost 500 seconds to get to Earth. This means the sunlight that reaches Earth is old. How is that possible? It is due to the concept of random walks. Part of the “It’s Okay to Be Smart” series.

Media Details

Runtime: 8 minutes 23 seconds

Topic: Science
Subtopic: Astronomy, Space Sciences
Grade/Interest Level: 10 - 12
Standards:

Release Year: 2020
Producer/Distributor: PBS Digital Studios
Series: It's Okay to Be Smart
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Seven different butterflies, where four are placed at the corners facing the butterfly at the center and two at either side of the central butterfly.

Different math equations and graphs are drawn, with a butterfly as the backdrop.

An animal with the body of a lion, an extra goat head on its back, and a snake instead of a tail. Caption: Chimera.

A star filled night sky. Caption: P B S.

Sunlight is shining through in a forest with large number of trees.

Eggs of Screech owl, Turkey vulture, Audubon's Caracara, Kingfisher, Common Murree, Yellow Billed. Caption: Stoddard Et Al. Science 20 17.

A view of Moon in the dark sky. Caption: Maria, Latin for seas, and Sea of Tranquility, Mare Tranquillitatis.

Two different types of bacteria are seen all over a human outline. Caption: 37.2 trillion and 39 trillion.

Collage with black and white illustration of a twelfth century Chinese man holding out a scrap of paper. A red lantern on a pole overhead. Red prohibited symbol covers image of 2 gold bars.

The sample particles enter the mass spectrometer, which is accelerated, and then separated according to their individual mass of the particles by a magnet.