英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • Comet - Wikipedia
    A comet is an icy, small Solar System body or interstellar object that warms and begins to release gases when passing close to the Sun, a process called outgassing This produces an extended, gravitationally unbound atmosphere or coma surrounding the nucleus, and sometimes a tail of gas and dust gas blown out from the coma These phenomena are due to the effects of solar radiation and the
  • Observational history of comets - Wikipedia
    The Book of Miracles (Augsburg, 16th century) Comets have been observed by humanity for thousands of years, but only in the past few centuries have they been studied as astronomical phenomena Before modern times, great comets caused worldwide fear, considered bad omens foreboding disaster and turmoil, for example the 1066 passage of Halley's Comet depicted as heralding the Norman conquest of
  • Lists of comets - Wikipedia
    Periodic comets usually have elongated elliptical orbits, and usually return to the vicinity of the Sun after a number of decades The official names of non-periodic comets begin with a "C"; the names of periodic comets begin with "P" or a number followed by "P" Comets that have been lost or disappeared have names with a "D"
  • 3I ATLAS - Wikipedia
    3I ATLAS For other comets discovered by the Asteroid Terrestrial-impact Last Alert System, see Comet ATLAS 3I ATLAS, also known as C 2025 N1 (ATLAS) and previously as A11pl3Z, is an interstellar comet [17][18] discovered on 1 July 2025 by the Asteroid Terrestrial-impact Last Alert System (ATLAS) station
  • List of comets by type - Wikipedia
    This is a list of comets (bodies that travel in elliptical, parabolic, and sometimes hyperbolic orbits and display a tail behind them) listed by type Comets are sorted into four categories: periodic comets (e g Halley's Comet), non-periodic comets (e g Comet Hale–Bopp), comets with no meaningful orbit (the Great Comet of 1106), and lost comets (5D Brorsen), displayed as either P (periodic
  • List of periodic comets - Wikipedia
    List of periodic comets Periodic comets (also known as short-period comets) are comets with orbital periods of less than 200 years or that have been observed during more than a single perihelion passage [1] (e g 153P Ikeya–Zhang) "Periodic comet" is also sometimes used to mean any comet with a periodic orbit, even if greater than 200 years
  • Halleys Comet - Wikipedia
    Halley's Comet[b] is the only known short-period comet that is consistently visible to the naked eye from Earth, [14] appearing every 72–80 years, [15] though with the majority of recorded apparitions (25 of 30) occurring after 75–77 years It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061
  • C 2023 A3 (Tsuchinshan–ATLAS) - Wikipedia
    Comet Tsuchinshan–ATLAS, also known as the Great Comet of 2024 and formally designated as C 2023 A3, is a non-periodic comet from the Oort cloud discovered by the Purple Mountain Observatory in China on 9 January 2023 and independently found by ATLAS South Africa on 22 February 2023 The comet passed perihelion at a distance of 0 39 AU (58 million km; 36 million mi) on 27 September 2024, [1


















中文字典-英文字典  2005-2009