Astronomy
6 notes tagged Astronomy.
- Science & Technology
Stellar Astrophysics and Star Life Cycles
A star's entire future, how long it lives and what it becomes when it dies, is decided by one number at birth: its mass. Nothing else about a star's life is left to chance.
- Science & Technology
Astronomical Objects and Their Classification
A nebula is where stars are born and a Cepheid is a star that has already lived most of its life pulsing at a precise, predictable rhythm, and swapping those two definitions is exactly the trap a pair-matching question sets.
- Science & Technology
Measuring Astronomical Distance and Scale
A light year measures distance, not time, and the reason astronomers reach for it is not that space is dark, it is that ordinary units like kilometres become unusably clumsy at the scale of a galaxy.
- Science & Technology
Space Weather and Solar-Terrestrial Physics
A solar storm can knock out satellites and power grids from 150 million kilometres away, but it cannot cause a tsunami, and knowing which effects are real versus invented is the entire question.
- Science & Technology
Observational Astronomy and Gravitational Waves
Einstein predicted gravitational waves in 1916 and doubted they could ever actually be measured; it took a hundred years and a detector sensitive to a distance smaller than a proton to prove him right twice over.
- Science & Technology
Satellite Orbits and Applications
A sensor in orbit cannot see gas directly, only what that gas does to light and heat, and every genuine remote-sensing capability, and every invented one a question offers, comes down to whether that indirect chain actually exists.