From high above the US, you might notice strange barcode-like markings on the ground. These symbols were once used to calibrate aerial and satellite cameras back in the 20th century, painted onto concrete or asphalt in black or white. Acting like eye charts for cameras, they helped fine-tune imaging equipment and determine optical resolution limits. And they aren't the only cool and weird things you'll find in the US. Let's talk about more mysterious things with an explanation.

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Credit:

By NASA Goddard Space Flight Center:

Phytoplankton bloom: https://flic.kr/p/8sMD3K, https://commons.wikimedia.org/w/index...

"Eye" of Smoke: https://flic.kr/p/PPbr9S, https://commons.wikimedia.org/w/index...

CC BY 2.0 https://creativecommons.org/licenses/...

1951 USAF resolution test chart: By Roͬͬ͠͠͡͠͠͠͠͠͠͠͠sͬͬ͠͠͠͠͠͠͠͠͠aͬͬ͠͠͠͠͠͠͠ Menkman, https://flic.kr/p/Mvb17f

The Marfa Mystery Lights: By Jon Hanson - https://flic.kr/p/6nyKTU, https://commons.wikimedia.org/w/index...

Phytoplankton Culture: By ©️ Moheen Reeyad, CC BY-SA 4.0 https://creativecommons.org/licenses/..., https://commons.wikimedia.org/w/index...

Animation is created by Bright Side.

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