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.

2024 August 13
The edge of the Earth is seen from space at night.
The curving horizon is tinted green but a red and blue
jet rises from left. 
Please see the explanation for more detailed information.

Giant Jet from the International Space Station
Image Credit: NASA, Expedition 71 Crew, JSC, ESRS, Matthew Dominick; Processing: Simeon Schmauß

Explanation: What's that on the horizon? When circling the Earth on the International Space Station early last month, astronaut Matthew Dominick saw an unusual type of lightning just beyond the Earth's edge: a gigantic jet. The powerful jet appears on the left of the featured image in red and blue. Giant jet lightning has only been known about for the past 23 years. The atmospheric jets are associated with thunderstorms and extend upwards towards Earth's ionosphere. The lower part of the frame shows the Earth at night, with Earth's thin atmosphere tinted green from airglow. City lights are visible, sometimes resolved, but usually creating diffuse white glows in intervening clouds. The top of the frame reveals distant stars in the dark night sky. The nature of gigantic jets and their possible association with other types of Transient Luminous Events (TLEs) such as blue jets and red sprites remains an active topic of research.

Growing Gallery: Perseid Meteor Shower 2024 and Aurorae
Tomorrow's picture: star factory


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