European Space Agency astronaut Sophie Adenot released a video explaining how people on Earth can spot the International Space Station using only their eyes [1].
The guide serves as a public education tool to help observers distinguish the orbiting laboratory from aircraft and stars. By explaining the physics of light reflection in space, the ESA aims to connect the general public with the ongoing activities of the station.
Recording the message on day 85 [1] of her mission during orbit 1,316 [1], Adenot said the visual characteristics of the station from a ground-based perspective. She noted that the ISS appears as a very bright star moving across the sky [1].
"From the ground, it looks like a very bright star moving across the sky at roughly the speed of a commercial airliner," Adenot said [1].
She clarified that the station differs from aircraft because it does not possess headlights or flashing navigation lights [1]. Instead, the visibility of the ISS is a result of its massive solar panels. These panels are positioned to catch sunlight and reflect it back toward Earth [1].
According to the ESA, the apparent speed of the station as seen from the ground is roughly the speed of a commercial airliner, which is approximately 900 km/h [1]. This steady, rapid movement allows observers to track the station as it passes overhead during specific windows of time.
The video was shared via the European Space Agency's social media channels to encourage amateur astronomy and interest in space exploration [1].
“"From the ground, it looks like a very bright star moving across the sky."”
The initiative highlights the ESA's strategy to use current crew members as science communicators. By simplifying the orbital mechanics and optics of the ISS, the agency increases public engagement with space infrastructure and encourages citizens to observe the physical presence of human activity in low Earth orbit.
