Since the moon only reflects sunlight , the amount of its surface that is illuminated , its 由于月球本身不发光，只是反射太阳光，所以会出现月
It merely reflects the light of the sun , like a huge mirror hung in the sky 这表明月亮本身不发光，它只是反射太阳光，象悬挂在天空中的一面镜子。
This is a major achievement because , in relative terms , planets are very small and do not emit light 这是一个重要的成就，因为相对来说，行星很小，而且也不发光。
Also suppose this star is dark or at least very faint , and because of that we haven ' t noticed it yet 这个假设也很显然，毕竟发光恒星比行星要好观测得多。大质量不发光就得解释一堆了。
Apart from the visible elements , we believe that our galaxy also contains some objects that do not emit any light . we call them 除了可以看得见的部分，我们相信银河系有不少天体是不发光的，统称为
The stars of heaven and their constellations will not show their light . the rising sun will be darkened and the moon will not give its light 10 [和合]天上的众星群宿，都不发光；日头一出，就变黑12暗，月亮也不放光。
[ niv ] the stars of heaven and their constellations will not show their light . the rising sun will be darkened and the moon will not give its light 10 [和合]天上的众星群宿，都不发光；日头一出，就变黑12暗，月亮也不放光。
Dark matter does not absorb or emit light . so far , astronomers have inferred its presence only indirectly by measuring the effects of its gravity 暗物质即不吸光也不发光，讫今为止天文学家们只能通过测量它的引力效应来间接地证明它的存在。
It is very difficult to measure directly the total mass of the universe because most of the matter in the universe is dark matter , which do not give out light 可是要直接测量出宇宙的总质量是很困难的，宇宙中大部分的物质似乎都不发光，称为暗黑物质。
It was thought to be unusual in that the star it orbits is a pulsar ? a rapidly rotating , extraordinarily dense neutron star that emits no light 因为它围绕旋转着的是一颗脉冲星[ 2 ] ? ?一类快速旋转、密度异乎寻常之大且不发光的中子星，这一发现在当时被认为非常奇特。
