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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 ...
Stars less massive than 0.25 M ☉, called red dwarfs, are able to fuse nearly all of their mass while stars of about 1 M ☉ can only fuse about 10% of their mass. The combination of their slow fuel-consumption and relatively large usable fuel supply allows low mass stars to last about one trillion ( 10 × 10 12 ) years; the most extreme of 0. ...
The antumbra (from the Latin ante "before" and umbra "shadow") is the region from which the occluding body appears entirely within the disc of the light source. An observer in this region experiences an annular eclipse , in which a bright ring is visible around the eclipsing body.
This top-category page is for specific stars. For groupings of stars, ... Star types (1 C, 88 P) + Astronomical catalogues of stars (16 C, 50 P) Star atlases (2 C, 8 P) >
Stars by type (25 C, 1 P) Pages in category "Star types" The following 88 pages are in this category, out of 88 total. This list may not reflect recent changes. A.
A planetary system and various minor objects such as asteroids, comets and debris, can form in a hierarchical process of accretion from the protoplanetary disks that surround newly formed stars. The various distinctive types of stars are shown by the Hertzsprung–Russell diagram (H–R diagram)—a plot of absolute stellar luminosity versus ...
Also called shadow snakes, shadow bands are famously difficult to capture on camera or video, though not impossible. ( This video taken in Nashville during the 2017 total solar eclipse is one of ...
The RGB stars are by far the most common type of giant star due to their moderate mass, relatively long stable lives, and luminosity. They are the most obvious grouping of stars after the main sequence on most HR diagrams, although white dwarfs are more numerous but far less luminous. Examples: Pollux, a K-type giant.
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