- Out on summer break, Alexander Schmorell and two friends decided to bike from Munich to Donauwörth, intending to catch a boat and float down the Danube to Austria. On paper, the 100-kilometer (60 mile) bike ride looked easy. The terrain was relatively flat, a biker’s paradise.
- Astronomy (Wikipedia)
Astronomy is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, meteoroids, asteroids, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth’s atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole.