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A-type star In the Harvard spectral classification system, a class of main-sequence star having spectra dominated by Balmer absorption lines of hydrogen. Stars of spectral class A are typically blue-white or white in color, measure between 1.4 and 2.1 times the mass of the Sun, and have surface temperatures of 7,600–10,000 kelvin.
Lists of galaxies. List of galaxies; List of largest galaxies; List of galaxies with richest globular cluster systems; List of nearest galaxies; List of galaxies named after people
Space travel can refer to: Spaceflight, flying into or through outer space; Spacefaring, to be capable of and active in space travel; Human spaceflight, space travel with a crew or passengers; Interplanetary spaceflight, travel between planets; Interstellar travel, travel between stars or planetary systems
Works related to space travel have popularized such concepts as time dilation, space stations, and space colonization. [1]: 69–80 [5]: 743 While generally associated with science fiction, space travel has also occasionally featured in fantasy, sometimes involving magic or supernatural entities such as angels. [a] [5]: 742–743
The earliest references to hyperspace in fiction appeared in publications such as Amazing Stories Quarterly (shown here is the Spring 1931 issue featuring John Campbell's Islands of Space). Emerging in the early 20th century, within several decades hyperspace became a common element of interstellar space travel stories in science fiction.
List of topics in space; topics as related to outer space. Accidents in space; Animals in space; Architecture in space; Batteries in space; Christmas in space;
A fictional astronaut is preferably part of a real space program, like NASA or the Soviet/Russian space program, or fictional knockoffs of the same (e.g. ANSA, IASA). A fictional astronaut preferably uses space travel technology within the realm of the possible.
Space stations; Teleportation. Teletransporter; Time travel. Alternate history: time travel can be used as a plot device to explore parallel universes. While alternate history has its own category (see above), it often occurs in time travel stories as well. Alternate future; Time loop; Travel to the Earth's center. Hollow Earth