英文字典中文字典


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       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
parsecs查看　parsecs　在百度字典中的解释百度英翻中〔查看〕
parsecs查看　parsecs　在Google字典中的解释Google英翻中〔查看〕
parsecs查看　parsecs　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • What is a parsec and how is it measured?
    2) Galaxy clusters come in at around 1 Mpc (that's pronounced megaparsecs, or millions of parsecs), and are the largest bound objects in the universe Pictured below is the galaxy cluster Abell 2218 3) The closest star to the planet Earth (not counting the sun, of course) is the star system Alpha Centauri, at a distance of just about 1 3 parsecs
  • Why was the standard distance set to 10 parsec and not simply to 1 parsec?
    His choice of "0 1" is not explained, but it seems to be entirely practical It is close to the median of parallax values of stars that had had their parallax measured at the time A parallax of 0 1 arcseconds corresponds (in terminology that did not exist in 1902) to a distance of 10 parsecs It is worth noting that there were other proposals
  • Converting parsecs to light years in the dumbest way possible
    I have to convert 132 parsecs to light years and I'm struggling to get the expected result Here is my method: $132 \\text{ pc} = 132'' = 2,2' = 0,03(6)°$ I have an equation for stellar parallax which
  • star - What is the closest stellar neighbour to Sirius? - Astronomy . . .
    The table lists the stellar distances from the Sun in parsecs A parsec is approximately 3 26164 light years Instead of converting parsecs to light years, I assume that a candidate star's distance from the Sun must be less than two times the distance of Sirius from the Sun, otherwise the Sun must be closer to Sirius than the other star
  • What are some applicable problems with the correct usage of G?
    In some fields of astrophysics, where distances are measured in parsecs (pc), velocities in kilometers per second (km s) and masses in solar units (), it is useful to express G as approximately 4 302 x 10^-3 pc M^-1 (km s)^2 Is G not approximately 6 67 x 10^-11 N(m kg)^2? Any reasonable explanation would be appreciated
  • Do parsecs scale as an inverse proportion with parallax angle?
    Using parsecs a means that we don't need to use a different unit for the angle, and the point of parsecs is that we can use "arcseconds" So it is correct to use distance (in parsec) = 1 parallax angle (in seconds)
  • How would I search within an angular distance of an object . . .
    I'm interested in the learning about the local densities around galaxies I've found myself a bit confused on how to relate angular distances (arcseconds) with physical distances (parsecs) when thinking about distances between two distant galaxies For example, let's say the average distance between galaxies within clusters is a few megaparsecs
  • distances - What would be the apparent magnitude of Betelgeuse if it . . .
    The distance to betelgeuse is poorly known, so we don't actually know how bright it is with much accuracy measurements of its parallax by satellite give a distance of 197 parsecs + - 45 parsecs (1 parsec is 3 26 light years) The absolute magnitude (the brightness if it were 10 parsecs distant) is estimated to be -5 85
  • parallax - A quick (elementary) check on arsecond conversion to sky . . .
    One huge confusion with "parsecs" is this: Parallax means the distance an object moves in two photos take six months apart That technique can be used with objects from 1 to about 100 parsecs away from us However, astronomers (for convenience) still use the measure "parsecs" even when the distance is far more than 100 parsecs
  • How are SIMBADs parallaxes calculated?
    Rigel, according to sky-map org is 236 967 parsecs away (0 0042p | ~773 ly) Wikipedia places it at 260 parsecs SIMBAD has nothing even close to these numbers Betelgeuse, according to sky-map org is 131 062 parsecs away (0 0076p | ~427 ly) Wikipedia places it at 168 1 parsecs Again, SIMBAD has completely different numbers





中文字典-英文字典  2005-2009