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The term quasar originated as a contraction of "quasi-stellar [star-like] radio source"—because they were first identified during the 1950s as sources of radio-wave emission of unknown physical origin—and when identified in photographic images at visible wavelengths, they resembled faint, star-like points of light.
This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.
Lists of astronomical objects. Selection of astronomical bodies and objects: Moon Mimas and Ida, an asteroid with its own moon, Dactyl. Comet Lovejoy and Jupiter, a giant gas planet. The Sun; Sirius A with Sirius B, a white dwarf; the Crab Nebula, a remnant supernova. A black hole (artist concept); Vela Pulsar, a rotating neutron star.
Excession is a 1996 science fiction novel by Scottish writer Iain M. Banks. It is the fifth in the Culture series, a series of ten science fiction novels which feature a utopian interstellar society called the Culture. It concerns the response of the Culture and other interstellar societies to an unprecedented alien artifact, the Excession of the title. The book is largely about the response ...
Stephen William Hawking, CH , CBE , FRS , FRSA (8 January 1942 – 14 March 2018) was an English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge. [ 6 ][ 17 ][ 18 ] Between 1979 and 2009, he was the Lucasian Professor of Mathematics at Cambridge, widely viewed as one of the most prestigious ...
Space is a three-dimensional continuum containing positions and directions. [1] In classical physics, physical space is often conceived in three linear dimensions. Modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime. [2] The concept of space is considered to be of fundamental importance to an understanding of the physical ...
Space travel, [1]: 69 [2]: 209–210 [3]: 511–512 or space flight[2]: 200–201 [4] (less often, starfaring or star voyaging[2]: 217, 220 ) is a science fiction theme that has captivated the public and is almost archetypal for science fiction. [4] Space travel, interplanetary or interstellar, is usually performed in space ships, and spacecraft propulsion in various works ranges from the ...
October Sky is the first memoir in a series of four, by American engineer Homer Hickam Jr. originally published in 1998 as Rocket Boys. Later editions were published under the title October Sky as a tie-in to the 1999 film adaptation. It is a story of growing up in a mining town, and a boy's pursuit of amateur rocketry in a coal mining town.