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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.
Pulsating stars swell and shrink, affecting their brightness and spectrum. Pulsations are generally split into: radial , where the entire star expands and shrinks as a whole; and non-radial , where one part of the star expands while another part shrinks.
In mathematics, in the field of topology, a topological space is said to have the shrinking property [1] or to be a shrinking space if every open cover admits a shrinking. A shrinking of an open cover is another open cover indexed by the same indexing set, with the property that the closure of each open set in the shrinking lies inside the corresponding original open set.
Gamma Mensae is the second-brightest star in the constellation, at magnitude 5.19. [17] Located 104.9 ± 0.5 light-years from Earth, [11] it is an ageing (10.6 billion year-old) star around 1.04 times as massive as the Sun. It has swollen to around 5 times the solar radius, [18] becoming an orange giant of spectral type K2III. [19]
An important uniform 5-polytope is the 5-demicube, h{4,3,3,3} has half the vertices of the 5-cube (16), bounded by alternating 5-cell and 16-cell hypercells. The expanded or stericated 5-simplex is the vertex figure of the A 5 lattice, . It and has a doubled symmetry from its symmetric Coxeter diagram.
The International Astronomical Union defines brown dwarfs as stars massive enough to fuse deuterium at some point in their lives (13 Jupiter masses (M J), 2.5 × 10 28 kg, or 0.0125 M ☉). Objects smaller than 13 M J are classified as sub-brown dwarfs (but if they orbit around another stellar object they are classified as planets). [ 7 ]
The shrink ray turns out to be faulty, however, as shrunken items return to normal size after a period of time. A shrink ray is a recurring device shown in Venture Brothers, although it never seems to actually work properly. In Despicable Me, Gru used a shrink ray to shrink the Moon and pocket it. The effects of the shrink ray are only ...
The Big Crunch is a hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor to reach absolute zero, an event potentially followed by a reformation of the universe starting with another Big Bang.