时间:2019-01-02 作者:英语课 分类:60秒科学


英语课

Fog Found on Saturn 1's Moon Titan

A study in Astrophysical Journal Letters reveals that Titan may be home to the familiar atmospheric 2 condition known as fog--but made out of methane 3. Karen Hopkin reports


The northeast just had its first big snow of the season. Meanwhile, on Titan, it was foggy. That weather report brought to you by researchers publishing in the journal Astrophysical Journal Letters. The scientists found that Titan, Saturn’s largest moon, is covered with puddles 4 of liquid methane, which give rise to a fog that’s as thick as pea soup—and smells a whole lot worse.


To make fog, you need lots of liquid. Here on earth, we use water. We’ve got water on the ground and in the air. And when the air can’t hold any more moisture because it’s totally saturated 5 or it cools down, you get condensation 6. So the morning fog, and the dew on your windshield, comes from air that’s cooled enough that it can’t hang onto its water.


Titan fog, on the other hand, comes from methane. Like water, methane can be a solid, liquid, or gas. On Titan, methane forms clouds and maybe even rain. And, when atmospheric methane condenses, it makes fog. That fog then sticks around because it’s in contact with the methane puddles, which keeps everything cool enough to keep the methane condensing.


So next time you visit Titan, don’t expect to get any great pictures of Saturn. And drive with your low beams on.

 



n.农神,土星
  • Astronomers used to ask why only Saturn has rings.天文学家们过去一直感到奇怪,为什么只有土星有光环。
  • These comparisons suggested that Saturn is made of lighter materials.这些比较告诉我们,土星由较轻的物质构成。
adj.大气的,空气的;大气层的;大气所引起的
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
n.甲烷,沼气
  • The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
  • Methane may have extraterrestrial significance.甲烷具有星际意义。
n.水坑, (尤指道路上的)雨水坑( puddle的名词复数 )
  • The puddles had coalesced into a small stream. 地面上水洼子里的水汇流成了一条小溪。
  • The road was filled with puddles from the rain. 雨后路面到处是一坑坑的积水。 来自《简明英汉词典》
a.饱和的,充满的
  • The continuous rain had saturated the soil. 连绵不断的雨把土地淋了个透。
  • a saturated solution of sodium chloride 氯化钠饱和溶液
n.压缩,浓缩;凝结的水珠
  • A cloud is a condensation of water vapour in the atmosphere.云是由大气中的水蒸气凝结成的。
  • He used his sleeve to wipe the condensation off the glass.他用袖子擦掉玻璃上凝结的水珠。
标签: methane
学英语单词
a crushing blow
anchovy dressings
anthracoid
Antinfani
AOI (and-or-invert)
atomic number 64
basalt wool
coalition-buildings
conidio-
cordaitaless
cotton covered
CREF
crush cutting
cup type electrostatic paint sprayer
curtiuss
d.p.ps
Dahlia Cav.
demonstrative geometry
display halt
dysmyelinating
Ellis, Havelock
environmental cost accounting
equity-like
expanding machine
external reserve
finite queue
frequency overlap
fuze firing mechanism
Gallinago gallinago delicata
gematrical
gmunden
granite gneiss
granulomas
hatchet-faced
Heriot-Watt
high-dump box
hot-cracking test
hysterical blepharospasmus
insulated neutral
IORT
judgmentally
large sample testing method
Leping Formation
Liikanen
m-nitrobenzaldehyde
manola fertilizers
math processing
medium rank
microhydro
microprocessing unit support chip
mining surveying
multiple dike
multiple expansion turbine
narrow workings
nly
Nohalon
ODBL
office building account
oil pollution liability
online mall
padlike
parastromateus niger
peritrichial
permanent seal cooling
phosphorus-nitrogen ratio
pirazolac
pit pairs
policy of neutrality
polymorphous cell
presbytery
preview gain
pulse damper
racemose aneurysm
rigging and left nut
sarcenchyma
seasoned lumber
Seismesthesia
seismic facies
semi-automatic quality control
semi-linear partial differential equation
shafting-grounding device
showtune
signal block system
silent gear change
single chip system parallel data transfers
sketch-a-saurous rexes
spenser
strange particle
sulfapyridine adiplon
svb
tall organization
Tchin-Garaguene
thiolates
time clocks
time-saving commodities
tinto de verano
toe structure
top off something
transposition wire
triode-heptode converter
villanage
whiteacres