看这两句英文什么意思啊--关于天文学中的disc是什么啊

看这两句英文什么意思啊--关于天文学中的disc是什么啊we see these stars in infrared,not because they produce more of that type of energy,but because the material in the disks stops energy of shorter wavelengths from reaching us.it is these disks from which planets are thought to form.