comet
彗星,扫把星,扫帚星,扫帚
Related Words
Definitions
- 1
Astronomy.
- : a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun.
Synonyms & Antonyms
Examples
A century later, as a comet carrying disease and social unrest has upended the world, Afrofuturism may be more relevant than ever.
Meteor showers occur when flyby comets leave a dusty trail behind, so that when Earth runs through the trail, the dirt strikes our atmosphere, burns up and we see shooting stars.
The outer disk of planetesimals—basically, a huge pile of leftover comets—was almost completely cleared out.
When a comet’s ice vaporizes in sunlight, dust grains also fly off the comet.
Scientists have known for over 100 years that comets can spark meteor showers, but it wasn’t until 1983 that researchers had the technology needed to connect the Geminids to a small asteroid, dubbed Phaethon because it swings so close to the sun.
They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.
The probe appears to be sitting at the bottom of a "cliff" on the comet, but beyond that it's hard to tell.
The basic approach went as planned: after separating from the Rosetta orbiter, Philae coasted slowly to the comet surface.
Landing on any other world is hard, but Comet 67P is especially challenging, even apart from the low gravity.
The comet is basically shaped like a rubber ducky, but with a much rougher surface.
The Comet started on her first trip up the Arkansas, being the first steam boat that ascended that river.