VOA慢速英语:科学家提出造成恐龙灭绝的新理论

impact – n. an act or event in which something strikes another thing

asteroid – n. a space rock, that can be small or the size of a large moon, that orbits the sun

comet – n. an outer space object that is made of material like gas and ice which is left behind in its orbit as it approaches the sun

debris – n. pieces that are left after something comes apart

tidal force – n. a secondary force of gravity involving two objects

shatter – v. to suddenly break into many pieces

fragment – n. a broken piece of something that was once larger

crater – n. a round hole made by an explosive force such as a bomb or an object falling from the sky