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Explore how astronomy uses observation, mathematics, and testable theories to explain the universe as a true science.

Explore how astronauts train for Mars through simulations, isolation, robotics, space medicine, and survival drills that prepare crews for deep-space flight.

A radio telescope detects invisible radio waves from space, revealing galaxies, pulsars, and cosmic gas that optical telescopes cannot see.

Learn what an astronomical unit is, how it is defined, its exact value, and why astronomers use it to measure the Solar System.

Learn what an observatory is, how it functions, and why these facilities matter in astronomy, climate science, and geophysics.

Learn how astronomers use spectroscopy to identify stars, planets, galaxies, and cosmic chemistry by analyzing light across the electromagnetic spectrum.

Learn what a reflector telescope is, how Newtonian and other designs work, and what to look for before buying one.

Learn how eclipse season works, why eclipses come in pairs, and what orbital geometry makes them possible.