The Milky Way Galaxy with Zodiacal Light & Aurora | International Space Station
Zodiacal light right after orbital sunset and The Milky Way galaxy.
The Milky Way Galaxy and Earth airglow. Green and yellow airglow occurs when atoms and molecules in the Earth's upper atmosphere, excited by sunlight, emit light to shed their excess energy. Or, it can happen when atoms and molecules that have been ionized by sunlight collide with and capture a free electron. In both cases, they eject a particle of light—called a photon—in order to relax again. Unlike episodic and fleeting auroras, airglow shines constantly throughout Earth’s atmosphere, and the result is a tenuous bubble of light that closely encases our entire planet.
The Milky Way Galaxy and Earth airglow during orbital sunset.
The Milky Way Galaxy and Earth airglow.
Stars and Earth aurora
These images were captured by Expedition 73 flight engineer and Japan Aerospace Exploration Agency (JAXA) astronaut Kimiya Yui aboard the International Space Station.
At certain times of the year, a band of sun-reflecting dust from the inner Solar System appears prominently just after sunset—or just before sunrise—and is called zodiacal light. Although the origin of this dust is still being researched, a leading hypothesis holds that zodiacal dust originates mostly from faint Jupiter-family comets and that it slowly spirals into the Sun.
Auroras are produced when the Earth's magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity.
Expedition 73 Crew
Station Commander: Sergey Ryzhikov (Roscosmos)
JAXA Flight Engineer (Japan): Kimiya Yui
Roscosmos (Russia) Flight Engineers: Alexey Zubritskiy, Oleg Platonov
NASA Flight Engineers: Jonny Kim, Zena Cardman, Mike Fincke
An international partnership of space agencies provides and operates the elements of the International Space Station (ISS). The principals are the space agencies of the United States, Russia, Europe, Japan, and Canada.
Image Credit: Japan Aerospace Exploration Agency (JAXA)/Kimiya Yui
Release Dates: Oct. 13 & 16, 2025
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