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Photoevaporation is the process where energetic radiation ionises gas and causes it to disperse away from the ionising source. The term is typically used in an astrophysical context where ultraviolet radiation from hot stars acts on clouds of material such as molecular clouds, protoplanetary disks, or planetary atmospheres.
WFPC2/HST image showing the asymmetric nebula surrounding VY CMa, which is the central star VY Canis Majoris is surrounded by an extensive and dense asymmetric red reflection nebula , with a total ejected mass of 0.2–0.4 M ☉ and a temperature of 800 kelvin , based on a DUSTY model atmosphere that has been formed by material expelled from ...
Enormous Lyα nebula (ELAN) Around the quasar UM287 at around z=2.3. Cosmic filament illuminated by the quasar. MAMMOTH-1: 1,441,000 ly (442,000 pc) [5] Enormous Lyα nebula (ELAN) The nebula is associated with the galaxy overdensity BOSS1441, [5] which is a protocluster at z=2.3. The nebula represents the circumgalactic medium. Its emission is ...
The taxonomy of the Cyanea species is not fully agreed upon; some zoologists have suggested that all species within the genus should be treated as one. Two distinct taxa, however, occur together in at least the eastern North Atlantic, with the blue jellyfish (Cyanea lamarckii Péron & Lesueur, 1810) differing in color (blue, not red) and smaller size (10–20 cm [3 + 7 ⁄ 8 – 7 + 7 ⁄ 8 ...
But even if the Earth had Eris's orbit (1.02 × 10 10 km, 68 AU), the Sun–Earth barycenter would still be within the Sun (just over 30,000 km from the center). To calculate the actual motion of the Sun, only the motions of the four giant planets (Jupiter, Saturn, Uranus, Neptune) need to be considered.
Map showing the Orion OB1 association, which contains the blue supergiants of Orion's Belt and the Orion Nebula. Betelgeuse is believed to be a runaway star that was ejected from the Orion OB1 association. The kinematics of Betelgeuse are complex. The age of Class M supergiants with an initial mass of 20 M ☉ is roughly 10 million years.
seen from Earth measuring about 0.002 lux −6.00: Crab Supernova of 1054: seen from Earth (6500 light-years away) [40] −5.90: International Space Station: seen from Earth when the ISS is at its perigee and fully lit by the Sun [41] −4.92: planet Venus: seen from Earth maximum brightness [42] when illuminated as a crescent −4.14: planet ...
Download the file enwiki-YYYYMMDD-pages-articles.xml.bz2 from the most recent dump. For example, on your.org , go to directory YYYYMMDD for the most recent date (for example 20171020 ), and retrieve the requested file (for example enwiki- 20171020 -pages-articles.xml.bz2 ).