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Há 1 dia · Of the main-sequence star types, stars more massive than 1.5 times that of the Sun (spectral types O, B, and A) age too quickly for advanced life to develop (using Earth as a guideline). On the other extreme, dwarfs of less than half the mass of the Sun (spectral type M) are likely to tidally lock planets within their habitable zone, along with other problems (see Habitability of red dwarf ...
Há 13 horas · Variable stars have periodic or random changes in luminosity because of intrinsic or extrinsic properties. Of the intrinsically variable stars, the primary types can be subdivided into three principal groups. During their stellar evolution, some stars pass through phases where they can become pulsating variables.
Há 4 dias · Types of Stars. Stars come in a variety of sizes, colors, and temperatures. Here are some common types: Red Dwarfs: These are the smallest and coolest stars, with a reddish hue. White Dwarfs: These are the remnants of dead stars, small and dense, with a white color. Yellow Dwarfs: Our Sun is a yellow dwarf, a medium-sized star with a yellow color.
Há 6 dias · NIRCam and MIRI composite. Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds.
Há 5 dias · Nova, any of a class of exploding stars whose luminosity temporarily increases from several thousand to as much as 100,000 times its normal level. A nova reaches maximum luminosity within hours after its outburst and may shine intensely for several days or occasionally for a few weeks, after which.
- The Editors of Encyclopaedia Britannica
Há 4 dias · Watch on. The Fascinating World of Stars: Exploring the Universe. Have you ever gazed up at the night sky and wondered about the twinkling lights that dot the vast expanse? Those shimmering points of light are stars, massive balls of hot gas that emit light and heat.
Há 2 dias · Guide Star Finder: A Web tool aimed at searching for suitable adaptive optics guide stars, either for single objects as for a list of observing targets. The tool is based on the USNO-SA2.0 catalogue. Work is in progress to use USNO-B catalogue as an option.
