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
redshift查看　redshift　在百度字典中的解释百度英翻中〔查看〕
redshift查看　redshift　在Google字典中的解释Google英翻中〔查看〕
redshift查看　redshift　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:


  • Redshift and Hubbles Law - NASA
    Redshift and Hubble's Law For very far objects (beyond about 1 billion light-years) none of the above methods work Scientists must move from direct observation to using observations in conjunction with a theory The theory used to determine these very great distances in the universe is based on the discovery by Edwin Hubble that the universe is expanding
  • How do we measure the distances to things in space? - NASA
    It is not an easy thing to measure the distances to objects in the universe since these objects are usually very far away We can't just run out there with a ruler! To measure distances in the universe, we will need to construct what is commonly referred to as a "cosmic distance ladder" In other words, astronomers use different methods to determine the distances to objects; the specific
  • StarChild: A Learning Center for Young Astronomers
    Well that's a redshift, redshift If the star is moving away By reading Doppler Shifts of all we see in the skies (clusters of galaxies, near and far) We get the big picture and a big surprise (redshifts going, redshifts going) The Universe is growing and expanding away (galaxies are speeding, speeding away) But maybe gravity will shrink it back
  • StarChild: A Learning Center for Young Astronomers
    Well that's a redshift, redshift If the star is moving away By reading Doppler Shifts of all we see in the skies (clusters of galaxies, near and far) We get the big picture and a big surprise (redshifts going, redshifts going) The Universe is growing and expanding away (galaxies are speeding, speeding away)
  • StarChild: A Learning Center for Young Astronomers - NASA
    StarChild is a learning center for young astronomers ages 5-13 to learn about the solar system, the Milky Way galaxy, and the universe beyond Use the links above to explore the site's topics If you are looking for something a bit more advanced (ages 14+), then head on over to Imagine the Universe!
  • What is a brown dwarf? - NASA
    Question: What is a brown dwarf? Answer: In order to understand what is a brown dwarf, we need to understand the difference between a star and a planet It is not easy to tell a star from a planet when you look up at the night sky with your eyes However, the two kinds of objects look very different to an astronomer using a telescope or spectroscope Planets shine by reflected light; stars
  • What is meant by false color? - NASA
    StarChild Question of the Month for April 2000 Question: What is meant by "false color"? Answer: The term "false color" is used to describe what astronomers (and others) often do to images to make them more comprehensible Long ago, when radio astronomers first started generating images of sources, they wound up with essentially images that were just shades of gray - ranging from pure black to
  • StarChild: The Universe - NASA
    The universe is a vast expanse of space which contains all of the matter and energy in existence The universe contains all of the galaxies, stars, and planets The exact size of the universe is unknown Scientists believe the universe is still expanding outward They believe this outward expansion is the result of a violent, powerful explosion that occurred about 13 7 billion years ago This
  • How do we know that dark matter exists? - NASA
    StarChild Question of the Month for July 2003 Question: How do we know that dark matter exists? Answer: Dark matter is the name scientists have given to the particles which we believe exist in the universe, but which we cannot directly see! Dark matter was initially called "missing matter" because astronomers could not find it by observing the universe in any part of the electromagnetic
  • StarChild: Cosmology - NASA
    For more than ten years astronomers studied the expansion of the universe by measuring the redshift and brightness of distant supernovae By 1998, enough information had been gathered to lead scientists to the startling discovery that the expansion of the universe is not slowing but accelerating





中文字典-英文字典  2005-2009