Star Type More Types Neutron Stars: The collapsed cores of massive stars, so dense that a teaspoon of their material would weigh billions of tons. Wolf-Rayet Stars: Rare, aging stars that are incredibly hot and losing mass through powerful stellar winds. Magnetars: A type of neutron star with an extremely powerful magnetic field that can strip information from credit cards from halfway to the moon. Pulsars: Highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation like cosmic light-houses. Blue Stragglers: Stars in old clusters that appear younger and bluer than they should, likely formed by colliding with or "vampirizing" other stars. Hypergiants: The largest and most luminous stars in the universe, sitting at the very top of the Hertzsprung-Russell diagram. T Tauri Stars: Very young "pre-main sequence" stars that are still shrinking and haven't yet started consistent nuclear fusion. Types O (Blue) : The hottest and most massive , > 30,000 K. >B (Blue-white) : Very hot and bright, 10,000 K - 30,000 K. A (White) : Hot, 7,500 K - 10,000 K. F (Yellow-white) : 6,000 K - 7,500 K. G (Yellow) : Examples include the Sun (G2), 5,000 K - 6,000K K (Orange) : Cooler than the sun, 3,500 K - 5,000 K M (Red) : Coolest and most common, < 3,500 K.
