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Red light, green light 🚦 On Jan. 19, 2026, NASA astronaut Chris Williams snapped this photo of an aurora borealis as the @ISS passed over Europe. The Earth was shadowed by night, but aglow with more than just city lights. An aurora occurs when energized particles in space collide with particles in Earth’s atmosphere, resulting in a bright and colorful light show. When it happens in the Northern Hemisphere, it’s called an aurora borealis, or the northern lights. In the Southern Hemisphere, it’s called an aurora australis, or southern lights. These light shows are typically found close to Earth’s northern and southern poles. But when Earth is hit with a huge flow of energized particles, like during a solar storm, auroras can stretch farther toward the equator. Image description: An image of shadowed Earth, lit up by the city lights of Europe and an aurora around its rim. The city lights appear as dense dots of warm light that outline the land’s shape. The aurora appears as two bands of light—one green and one red—outlining the planet. Credit: NASA/Chris Williams #NASA #ISS #Astrophotography #RedGreen

01.28 01:28

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