Sometimes we call meteors shooting stars, because the friction and heat of entering the atmosphere causes them to burn and glow in the sky.

有我们称流星为“shooting stars”，因为进入气层的摩擦和热量使它们在天空中燃烧发光。

As anything falls toward the earth from space, it's constantly rubbing against the air of the earth's atmosphere which heats it up so hot that it glows.

当任何东西空落向，它不断与气层的空气摩擦， 使它变得如此热， 以至于它发光。

What Michelson and Morley did, without actually intending to, was undermine a long-standing belief in something called the luminiferous ether, a stable, invisible, weightless, frictionless, and unfortunately wholly imaginary medium that was thought to permeate the universe.

迈克尔逊和莫利所做的， 实际上并没有打算这样做，而是破坏了人们对一种叫做发光以的东西的长期信念，这是一种稳定的、不可见的、无重量的、无摩擦的，不幸的是，它完全是虚构的介质， 被认为渗透到宇宙中。