Satellite Constellations Pose Significant Threat to Space-Based Astronomy
A NASA-led study reveals that the rapid increase in low-Earth orbit satellites could severely impact space telescope observations, with up to 96% of images potentially contaminated by satellite streaks.
The proliferation of satellite constellations in low-Earth orbit (LEO) is poised to significantly disrupt space-based astronomical observations, according to a recent NASA-led study published in Nature. The research indicates that the growing number of satellites could lead to substantial contamination of images captured by space telescopes.
The study focused on four space telescopes: NASA's Hubble Space Telescope, the upcoming SPHEREx mission, the European Space Agency's planned ARRAKIHS observatory, and China's proposed Xuntian telescope. Findings suggest that approximately 40% of Hubble's images may be affected by satellite streaks, while the other three telescopes could experience contamination in up to 96% of their images.
This issue arises from the dramatic increase in satellites orbiting Earth. In 2019, there were about 2,000 satellites in LEO; by 2025, this number has surged to approximately 15,000, with projections estimating up to 560,000 satellites within the next decade.
The interference is primarily due to satellites reflecting sunlight and emitting radiation, which can create bright streaks in telescope images. This contamination poses a significant challenge for space-based observatories, which were previously considered less susceptible to such disruptions compared to their ground-based counterparts.
To mitigate these effects, researchers suggest deploying satellites at lower altitudes than space telescopes and implementing measures to reduce their reflectivity. However, these solutions require collaboration between the astronomical community and satellite operators to ensure the continued effectiveness of space-based astronomical research.
