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A 3.5-gallon volume of deep space, specifically within the Milky Way's Orion-Cygnus Arm, would contain approximately 4 million neutrinos and about 13,000 gas atoms, predominantly hydrogen and helium.

NASA's ambitious mission to return astronauts to the moon for the first time this century is on track to launch no later than April 2026, but it just might fly sooner if all goes well. Final tests of ...

Larger aperture telescopes gather more light, showing fainter objects. Focal length affects magnification; longer lengths show more detail. Reflectors are affordable and good for deep-space viewing. A ...