Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2026 July 15
Lightning spreads like roots from a tree up into the atmosphere from the top of a cloud. Stars are scattered across the night sky above and the desert sits below the cloud deck.

Gigantic Jet Over the Tatacoa Desert
Image Credit & Copyright: Mario Vargas
Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)

Explanation: Is there an angry Sith using force lightning in the Tatacoa Desert?  This is not science fiction, but a gigantic jet with multiple red streamers! Ordinary lightning occurs when thundercloud particles collide, lose their electrons, and build up negative charge at the cloud bottom.  The cloud’s negative charge repels negative charge deeper into the Earth, leaving Earth’s surface positively charged.  The opposite charges attract, reaching towards each other and superheating the air into a white strike of plasma.  A gigantic jet occurs when internal cloud discharge escapes upward through a weak positive shielding layer, and shoots up from the cloud in less than a second.  They extend up into the mesosphere where the air is too thin for thunder.  The streamers at the top may resemble red sprites and get their color from heated molecular nitrogen

Note: The text of this APOD has been revised.
Tomorrow's picture: a galaxy bursting with excitement


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