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The first evidence that Saturn might have an internally generated magnetic field came in 1974, with the detection of weak radio emissions from the planet at the frequency of about 1 MHz. These medium wave emissions were modulated with a period of about 10 h 30 min, which was interpreted as Saturn's rotation period. [10]
Frequency is a 2000 American science fiction thriller film starring Dennis Quaid, Jim Caviezel, Andre Braugher, Elizabeth Mitchell, Shawn Doyle, Melissa Errico, and Noah Emmerich. Directed by Gregory Hoblit and written by Toby Emmerich , it was distributed by New Line Cinema .
The Sun is a Population I, or heavy-element-rich, [b] star. [30] Its formation approximately 4.6 billion years ago may have been triggered by shockwaves from one or more nearby supernovae . [ 31 ] [ 32 ] This is suggested by a high abundance of heavy elements in the Solar System, such as gold and uranium , relative to the abundances of these ...
The Table Mountain site used a Nd:YAG laser operating at a frequency-doubled wavelength of 532 nm, with a repetition rate of 15 to 30 Hertz and a pulse power full width at half maximum (FWHM) in the tens of megawatts range, which was coupled to a 0.6 m (2.0 ft) Cassegrain reflector telescope for transmission to Galileo. The Starfire range site ...
While Mercury also stays near the sun, Venus appears more prominent, since it is the third brightest object in Earth's sky after the Moon and the Sun. [30] [31] In 1961, Venus became the target of the first interplanetary flight, Venera 1, but radio contact was lost before it arrived in May 1961.
They include ethane (C 2 H 6), acetylene (C 2 H 2), methylacetylene (CH 3 C 2 H), and diacetylene (C 2 HC 2 H). [ 102 ] [ 105 ] [ 106 ] Spectroscopy has also uncovered traces of water vapour, carbon monoxide , and carbon dioxide in the upper atmosphere, which can only originate from an external source such as infalling dust and comets .
[30] [31] Cerium, a rare-earth element discovered in 1803, was named after Ceres. [32] [c] The old astronomical symbol of Ceres, still used in astrology, is a sickle, . [22] [34] The sickle was one of the classical symbols of the goddess Ceres and was suggested, apparently independently, by von Zach and Bode in 1802. [35]