“发出光”造句
所有的恒星都会
发出光和热.
All the stars send out light and heat.
这样的天体本身也可能
发出光, 但是它的重力最后还是会把光吸引回去.
Light itself could leave from such an object, but gravity would eventually pull it back again.
脉冲星是一种能够
发出光脉冲的天体.
A pulsar is a celestial object that emits light in short burst.