visual binary造句

• Wide visual binary
  远距目视双星
• Binary systems in which both components can be seen are called visual binary stars
  ：若双星中所有成员皆可以看得到，我们便称之为目视双星。
• Sometimes , in a binary star system , one star will pass in front of the other producing what we call eclipsing binary . it can be treated as a special kind of visual binary . eclipsing binary systems are variable stars see below
  ：有些双星系统，其中一颗星会在另一颗星前经过，产生周期性的光度变化，我们称这种双星为食双星，基本上我们可以把食双星看成为目视双星的一种。