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- 1New Satellite Engine Could Use Earth's Atmosphere as Fuel●New Satellite Engine Could Use Earth's Atmosphere to Stay in Orbit Indefinitely
Researchers have unveiled an atmospheric-breathing electric propulsion concept that collects air molecules from the upper atmosphere and uses them as propellant, allowing satellites in very low orbit to counteract drag indefinitely without carrying finite fuel. The approach could enable longer-lived Earth observation satellites and cheaper low-altitude missions. Tech and space communities are debating its feasibility, thrust levels, and how it compares with conventional electric propulsion systems.
- 2Earth's atmosphere has gotten less dusty, puzzling scientists●In a mysterious reversal, Earth’s atmosphere has gotten less dusty
Researchers report that the amount of dust in Earth's atmosphere has declined, a reversal of the long-term trend. The shift is described as mysterious, with the causes not yet fully understood. Dust affects climate, weather patterns and air quality, so scientists are paying close attention to what is driving the change and what it could mean for warming.