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Dark stars and black holes both have a surface escape velocity equal or greater than lightspeed, and a critical radius of r ≤ 2M. However, the dark star is capable of emitting indirect radiation – outward-aimed light and matter can leave the r = 2M surface briefly before being recaptured, and while outside the critical surface, can interact ...
In April 2023, a study investigated four extremely redshifted objects discovered by the James Webb Space Telescope. [5] Their study suggested that three of these four, namely JADES-GS-z13-0, JADES-GS-z12-0, and JADES-GS-z11-0, are consistent with being point sources, and further suggested that the only point sources which could exist in this time and be bright enough to be observed at these ...
The Dark Star, a 1917 novel by Robert W. Chambers; Dark Star, a 1929 novel by Lorna Moon; The Dark Star, a 1939 novel by Margaret Mackie Morrison, writing as March Cost; Dark Star, a 1969 novel by Norma K. Hemming, writing as Nerina Hilliard
The Cosmic Origins Spectrograph (COS) is a science instrument that was installed on the Hubble Space Telescope during Servicing Mission 4 in May 2009. It is designed for ultraviolet (90–320 nm) spectroscopy of faint point sources with a resolving power of ≈1,550–24,000.
A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.
The old coordinates (x, y, z) of a point Q are related to its new coordinates (x′, y′, z′) by [14] [′ ′ ′] = [ ] []. Generalizing to any finite number of dimensions, a rotation matrix A {\displaystyle A} is an orthogonal matrix that differs from the identity matrix in at most four elements.
Rewriting the ratios of factorials in the radial part as products of binomials shows that the coefficients are integer numbers: = = () ().A notation as terminating Gaussian hypergeometric functions is useful to reveal recurrences, to demonstrate that they are special cases of Jacobi polynomials, to write down the differential equations, etc.:
Radio-frequency interference from a GSM telephone transmitting 0.5 W at 1.8 GHz at a distance of 1 km (RSSI of −70 dBm) [9] 20 000 000: Disturbed Sun at 20 MHz (Karl Guthe Jansky's initial discovery, published in 1933) 4 000 000: Sun at 10 GHz 1 600 000: Sun at 1.4 GHz: 1 000 000: Milky Way at 20 MHz 10 000: 1 solar flux unit: 2 000: Milky ...