孔之中心

Four times a year, Ghez focuses the telescope on the stars of the very heart of our Milky Way. She is looking for the telltale high speeds that reveal the presence of a black hole. The center of the M

发表于:2018-12-07 / 阅读(315) / 评论(0) 分类 超大质量黑洞

In every galaxy scientists looked at, they found evidence for a supermassive black hole. NGC 3115 NGC 3377 NGC 3379 In M31 and M32 In total there is probably 20-30 or so black holes that have been fou

发表于:2018-12-07 / 阅读(321) / 评论(0) 分类 超大质量黑洞

By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w

发表于:2018-12-07 / 阅读(330) / 评论(0) 分类 超大质量黑洞

Heres what scientists think happened, oh, about a hundred million years ago. There was this three-star system. The three linked stars were strolling through the galaxy but got too close to the giant black hole at the center. The hole swallowed one of

发表于:2018-12-24 / 阅读(32) / 评论(0) 分类 Scientific American(七)月

A hypervelocity star appears to be the remains of a three-star system, one star of which was digested by the Milky Way's black hole, with the other two being combined and hurled away. Heres what scientists think happened, oh, about a hundred million

发表于:2019-01-02 / 阅读(30) / 评论(0) 分类 60秒科学

Did you ever dream of digging a hole so deep it came out the other side of the earth? Let's play that game again, using a little physics. First we have to imagine that our tunnel is lined with super-heat-resistant material so we can pass through laye

发表于:2019-03-06 / 阅读(109) / 评论(0) 分类 英语时差8,16
学英语单词
abies chensiensis van tiegh.
abnormal fertilization
aceto-
acuminulate
advanced very high resolution radiometer (avhrr)
agrophytes
alcazars
annona reticulatas
any one location
aphelinids
askaig
at a burst
B-Y amplifier
bag fries
be afraid of
be apprenticed to
begetter
benedikte
blood doping
Bulbophyllum hastatum
Catunaregam
Chechon
chief operator
chrome-plateds
correction card
dakhla
daylight lighting
decontamination system pump
dinoprostone
dissolubility
doozies
drive end
dryopteridaceaes
elephantiasis scroti
Ethiopianizing
fimbriae of uterine tube
flat jewel cylindrical hole for detent
footfishing
forsythol
genus monomoriums
give someone the go-by
gluttonously
greasing of insulator
guy stub
Hemphillian
hidden octaves
horse-head fish
ice band
improper rotation axis
improvidential
input-output peripheral
ischogalactic
japonisme
kekaeshi
keymappings
Kolochau
Kwazulu
lytter
melodramaticism
Mifflinville
muiclage envelope
noncomparable
octyldodecanol
on the chance of
on-line help system
papillocarcinoma
parforme
phosphated fabric
plastic machinery
Pontederia cordata
pulau-pulau
push fall step
put someone into buttons
ratfink
reverse timing
rhomboid minor muscle
road-trip
rotor inlet gas angle
rubber slab for equipment lining
Rémuzat
Saint-Gilles-sur-Vie
savagine
Schizothyriaceae
Sealalloy
self check system
serving performance
siranis
sistre
slurry feeder
straight-line flow
surface contamination indicator
Syndiclis sichourensis
Trinidad, I.
unrestrictable
Uskedal
Van der Merwe
Villa Flores
water-bearing stone
yang disease involving yin
zinc ammonium salts
zophorus