a*******r
发帖数: 7558 | 1 【 以下文字转载自 Astronomy 讨论区 】
发信人: sunspot (小甜甜), 信区: Astronomy
标 题: Astronomy Picture of Day: the car, the hoe and the meteorit
发信站: BBS 未名空间站 (Mon Nov 20 19:05:37 2006), 转信
The Car, the Hole, and the Peekskill Meteorite
Credit & Copyright: Pierre Thomas (LST), ENS Lyon
Explanation: The Peekskill meteor of 1992 was captured on 16 independent
videos and then struck a car. Documented as brighter than the full Moon, the
spectacular fireball crossed parts of several US states during its 40
seconds of |
|
s******o
发帖数: 298 | 2 March 14, 2002 | Ever since it was trumpeted at a hastily convened press
conference in August 1996, the subject of possible signs of life in the Martian
meteorite ALH 84001 has remained intensely controversial. At the time, David
S. McKay (NASA/Johnson Space Center) and his coauthors presented four lines
of evidence suggesting that the 4-billion-year-old meteorite contains chemical
or fossil traces of microbial life. In the years since, however, these signs
have been disputed by other researcher |
|
s******o
发帖数: 298 | 3 By Leonard David
Senior Space Writer
posted: 09:30 am ET
14 May 2002
A meteorite that fell to Earth from Mars purported to offer evidence of past
Martian biology has fallen from grace. That's the assertion from two
scientists who say the rock's strongest link to life -- as claimed by other
researchers -- has broken down.
In December 1984, ALH 84001 -- often called the "Mars rock" -- was picked up
in Antarctica by a National Science Foundation-sponsored meteorite-hunting
expedition. Tossed into s |
|
s*****t
发帖数: 1994 | 4 The Car, the Hole, and the Peekskill Meteorite
Credit & Copyright: Pierre Thomas (LST), ENS Lyon
Explanation: The Peekskill meteor of 1992 was captured on 16 independent
videos and then struck a car. Documented as brighter than the full Moon, the
spectacular fireball crossed parts of several US states during its 40
seconds of glory before landing in Peekskill, New York. The resulting
meteorite, pictured here, is composed of dense rock and has the size and
mass of an extremely heavy bowling ball. |
|
s*****t
发帖数: 1994 | 5 3D Barringer Meteorite Crater
Credit & Copyright: Stefan Seip (Astro Meeting)
Explanation: Barringer Meteorite Crater, near Winslow, Arizona, is one of
the best known impact craters on planet Earth. View this color stereo
anaglyph with red/blue glasses to get a dramatic sense of the crater's
dimensions -- one mile wide, and up to 570 feet deep. (A cross-eyed stereo
pair is available here.) Historically, this crater is the first recognized
to be caused by an impact rather than a volcanic eruption |
|
s******o
发帖数: 298 | 6 March 14, 2002 | Ever since it was trumpeted at a hastily convened press
conference in August 1996, the subject of possible signs of life in the Martian
meteorite ALH 84001 has remained intensely controversial. At the time, David
S. McKay (NASA/Johnson Space Center) and his coauthors presented four lines
of evidence suggesting that the 4-billion-year-old meteorite contains chemical
or fossil traces of microbial life. In the years since, however, these signs
have been disputed by other researcher |
|
s******o
发帖数: 298 | 7 By Leonard David
Senior Space Writer
posted: 09:30 am ET
14 May 2002
A meteorite that fell to Earth from Mars purported to offer evidence of past
Martian biology has fallen from grace. That's the assertion from two
scientists who say the rock's strongest link to life -- as claimed by other
researchers -- has broken down.
In December 1984, ALH 84001 -- often called the "Mars rock" -- was picked up
in Antarctica by a National Science Foundation-sponsored meteorite-hunting
expedition. Tossed into s |
|
s*****t
发帖数: 1994 | 8 The Car, the Hole, and the Peekskill Meteorite
Credit & Copyright: Pierre Thomas (LST), ENS Lyon
Explanation: The Peekskill meteor of 1992 was captured on 16 independent
videos and then struck a car. Documented as brighter than the full Moon, the
spectacular fireball crossed parts of several US states during its 40
seconds of glory before landing in Peekskill, New York. The resulting
meteorite, pictured here, is composed of dense rock and has the size and
mass of an extremely heavy bowling ball. |
|
s*****t
发帖数: 1994 | 9 3D Barringer Meteorite Crater
Credit & Copyright: Stefan Seip (Astro Meeting)
Explanation: Barringer Meteorite Crater, near Winslow, Arizona, is one of
the best known impact craters on planet Earth. View this color stereo
anaglyph with red/blue glasses to get a dramatic sense of the crater's
dimensions -- one mile wide, and up to 570 feet deep. (A cross-eyed stereo
pair is available here.) Historically, this crater is the first recognized
to be caused by an impact rather than a volcanic eruption |
|
|
s******o
发帖数: 298 | 11 By David L. Chandler
Updated March 17, 2001 | All last week, attendees at the 33rd annual Lunar
and Planetary Science Conference in Houston, Texas, looked forward to one of
the meeting's final sessions, whose main attraction was the controversial 4
1/2-billion-year-old Martian meteorite known as ALH 84001. For years David S.
McKay (NASA/Johnson Space Center) and his coauthors have maintained that this
celebrated stone contains strong evidence — but not proof — of fossilized
microbial life.
Frida |
|
s******o
发帖数: 298 | 12 By David L. Chandler
Updated March 17, 2001 | All last week, attendees at the 33rd annual Lunar
and Planetary Science Conference in Houston, Texas, looked forward to one of
the meeting's final sessions, whose main attraction was the controversial 4
1/2-billion-year-old Martian meteorite known as ALH 84001. For years David S.
McKay (NASA/Johnson Space Center) and his coauthors have maintained that this
celebrated stone contains strong evidence — but not proof — of fossilized
microbial life.
Frida |
|
W***u
发帖数: 789 | 13 07:19 AM ET
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Rush on to find fragments of California meteor
There's a new rush on in California's gold rush country. This time, they're
prospecting for meteorites.
A minivan-sized meteor blew up over northern California on Sunday morning,
and now everyone from NASA scientists to schoolkids is looking for fragments
of the fireball – called meteorites once they hit the ground – in the... 阅读全帖 |
|
H********g
发帖数: 43926 | 14 1）If the rock becomes molten, as happens in Earth's mantle, such
nonradioactive end products typically escape or are redistributed.[19] Thus
the age of the oldest terrestrial rock gives a minimum for the age of Earth,
assuming that no rock has been intact for longer than the Earth itself.
2）Most geological samples from Earth are unable to give a direct date of
the formation of Earth from the solar nebula because Earth has undergone
differentiation into the core, mantle, and crust, and this has t... 阅读全帖 |
|
b*s
发帖数: 82482 | 15 http://www.scientificamerican.com/article/were-meteorites-the-o
Were Meteorites the Origin of Life on Earth?
DNA building blocks found in meteorite took shape in deep space
Jun 16, 2008 |By JR Minkel
A new study finds that a pair of chemical building blocks similar to those
in genetic material was present in a meteorite before it fell to Earth in
the 1960s. Researchers say the finding makes it slightly more plausible that
meteorite bombardments may have seeded ancient Earth with life's raw
mater... 阅读全帖 |
|
F*********n
发帖数: 2914 | 16 http://news.yahoo.com/s/digitaltrends/nasascientistfindsevidenc
Aliens exist, and we have proof.
That astonishingly awesome claim comes from Dr. Richard B. Hoover, an
astrobiologist at NASA’s Marshall Space Flight Center, who says he has
found conclusive evidence of alien life — fossils of bacteria found in an
extremely rare class of meteorite called CI1 carbonaceous chondrites. (There
are only nine such meteorites on planet Earth.) Hoover’s findings were
published late Friday night in the Journ... 阅读全帖 |
|
F*********n
发帖数: 2914 | 17 【 以下文字转载自 Military 讨论区 】
发信人: ForgotMyPin (yy有益身体健康), 信区: Military
标 题: NASA 爆料: 发现外星生命
发信站: BBS 未名空间站 (Sun Mar 6 01:14:26 2011, 美东)
http://news.yahoo.com/s/digitaltrends/nasascientistfindsevidenc
Aliens exist, and we have proof.
That astonishingly awesome claim comes from Dr. Richard B. Hoover, an
astrobiologist at NASA’s Marshall Space Flight Center, who says he has
found conclusive evidence of alien life — fossils of bacteria found in an
extremely rare class of meteorite called CI1 carbonac... 阅读全帖 |
|
R********n
发帖数: 3601 | 18 【 以下文字转载自 Military 讨论区 】
发信人: ForgotMyPin (yy有益身体健康), 信区: Military
标 题: NASA 爆料: 发现外星生命
发信站: BBS 未名空间站 (Sun Mar 6 01:14:26 2011, 美东)
http://news.yahoo.com/s/digitaltrends/nasascientistfindsevidenc
Aliens exist, and we have proof.
That astonishingly awesome claim comes from Dr. Richard B. Hoover, an
astrobiologist at NASA’s Marshall Space Flight Center, who says he has
found conclusive evidence of alien life — fossils of bacteria found in an
extremely rare class of meteorite called CI1 carbonac... 阅读全帖 |
|
e***s
发帖数: 1188 | 19 【 以下文字转载自 Military 讨论区 】
发信人: ForgotMyPin (yy有益身体健康), 信区: Military
标 题: NASA 爆料: 发现外星生命
发信站: BBS 未名空间站 (Sun Mar 6 01:14:26 2011, 美东)
http://news.yahoo.com/s/digitaltrends/nasascientistfindsevidenc
Aliens exist, and we have proof.
That astonishingly awesome claim comes from Dr. Richard B. Hoover, an
astrobiologist at NASA’s Marshall Space Flight Center, who says he has
found conclusive evidence of alien life — fossils of bacteria found in an
extremely rare class of meteorite called CI1 carbonac... 阅读全帖 |
|
F*********n
发帖数: 2914 | 20 http://news.yahoo.com/s/digitaltrends/nasascientistfindsevidenc
Aliens exist, and we have proof.
That astonishingly awesome claim comes from Dr. Richard B. Hoover, an
astrobiologist at NASA’s Marshall Space Flight Center, who says he has
found conclusive evidence of alien life — fossils of bacteria found in an
extremely rare class of meteorite called CI1 carbonaceous chondrites. (There
are only nine such meteorites on planet Earth.) Hoover’s findings were
published late Friday night in the Journ... 阅读全帖 |
|
S**********e
发帖数: 173 | 21 http://www.3news.co.nz/Buddhist-statue-stolen-by-Nazis-carved-f
Buddhist statue stolen by Nazis carved from meteorite
A millennium-old swastika-bearing Buddhist statue, stolen from its home in
Tibet by the Nazis in 1938, was carved out of rock from outer space.
No, it's not the plot to a new Indiana Jones film – this statue, of the
Buddhist mythological figure Vaisravana, is real.
New research published in the journal Metoritics & Planetary Science reveals
the 24cm tall statue was carved out of ... 阅读全帖 |
|
W*****B
发帖数: 4796 | 22 曾经有
In puffs of gas from rocks more than 3 billion years old dug up by one
of NASA's robotic explorers on Mars, scientists have identified several
complex organic molecules — possible building blocks for
ancient life.
It’s not aliens. (It’s never aliens.)
But it is “consistent with the past presence of biology,” said Ken
Williford, an astrobiologist at NASA's Jet Propulsion Laboratory. “And
it makes us more confident that if biomarkers” — or direct evidence of
biologic activi... 阅读全帖 |
|
|
s******o
发帖数: 298 | 24 By J. Kelly Beatty
July 19, 2002 | Crack open a primitive, carbonaceous meteorite, and you'll
likely be gazing at countless microscopic flecks of diamond — sometimes
numerous enough to total 0.1 percent of the meteorite's mass. Ever since their
discovery in 1987, these meteoritic "nanodiamonds" have been thought to be,
quite literally, stardust: tiny crystals of high-density carbon forged in the
expanding shock waves of supernova explosions. Researchers have long believed
that the diamonds preda |
|
p********t
发帖数: 1219 | 25 General research interests:
The petrology, mineral chemistry and alteration history of the Martian
meteorites, and what they tell us about the crust of Mars.
The recovery and classification of Antarctic meteorites and micrometeorites.
The recent history of the East Antarctic icesheet and its relationship to
polar meteorite concentrations.
Studies of terrestrial analogs to igneous planetary materials, such as "
primitive" archean ultramafic complexes.
Cryogenic weathering processes and ice / rock |
|
s******o
发帖数: 298 | 26 By J. Kelly Beatty
July 19, 2002 | Crack open a primitive, carbonaceous meteorite, and you'll
likely be gazing at countless microscopic flecks of diamond — sometimes
numerous enough to total 0.1 percent of the meteorite's mass. Ever since their
discovery in 1987, these meteoritic "nanodiamonds" have been thought to be,
quite literally, stardust: tiny crystals of high-density carbon forged in the
expanding shock waves of supernova explosions. Researchers have long believed
that the diamonds preda |
|
d****z
发帖数: 9503 | 27 http://www.world-nuclear.org/info/inf78.html
Enrichment in Earth's crust
Many analyses have been made of the uranium in the rocks forming the
continental and oceanic crusts, and in samples of the Earth's mantle
exposed as uplifted slices in mountain belts or as 'xenoliths' in
basalts and kimberlites (hosts of diamonds).
We can have some confidence that these measurements are robust for the
crust and upper mantle of the Earth, but less confidence that we know
the abundance of uranium in the lower... 阅读全帖 |
|
v*******n
发帖数: 8995 | 28 现在西部上午十一点，
头条是说了几天的美东大雪，第二条，macy不放气球了。
breaking news 哪？？？？
昨天b52到贼快的。妈的连obama的火鸡都有个link。。。。。
THE LATEST
9 tips for holiday travel survival
Parents held girls captive for months
CBS puts Lara Logan on leave CBS puts Lara Logan on leave
Logan's Benghazi story discredited
Small firms can't use Obamacare site
'Knockout' victim: 'Whole group laughed'
Big airline merger gets go-ahead
Berlusconi kicked out by Senate
Jessica Ridgeway's killer: I lied to her
Parenting book blamed for deaths Parenting b... 阅读全帖 |
|
B*V
发帖数: 3365 | 29 现在西部上午十一点，
头条是说了几天的美东大雪，第二条，macy不放气球了。
breaking news 哪？？？？
昨天b52到贼快的。妈的连obama的火鸡都有个link。。。。。
THE LATEST
9 tips for holiday travel survival
Parents held girls captive for months
CBS puts Lara Logan on leave CBS puts Lara Logan on leave
Logan's Benghazi story discredited
Small firms can't use Obamacare site
'Knockout' victim: 'Whole group laughed'
Big airline merger gets go-ahead
Berlusconi kicked out by Senate
Jessica Ridgeway's killer: I lied to her
Parenting book blamed for deaths Parenting boo... 阅读全帖 |
|
p****p
发帖数: 3360 | 30 评论：
Good guy at 0:23 getting the woman out before him
Most of russia's population is bears... E.T is fucked...
Bigger asteroids are EASIER to calculate their trajectory exactly
because they are easier to see.
He's like... hurry lets repopulate!
this shit is for real, run dinos
Optimus Prime is here.
0:21 Hey I'm the last man on earth
0:21 It's the end. Let's fuck!
I wonder if the Russian air defense system detected the meteor's
approach.
The Dude just thin... 阅读全帖 |
|
k*****a
发帖数: 1463 | 31 Enough mass will be a globe. Only meteorite are irregular (some big
meteorite have enough gravity to make a globe). |
|
y********l
发帖数: 3970 | 32 出于对黄虫的敬重，我来献丑了。
Only real fundamentalists *** the notion that God physically created the
world in seven days. It's metaphorical. Do you know what a metaphor is?
Don't you think it's hypocritical of the church to insist on creationism for
centuries, only to jump on the intelligent design bandwagon now？
If evolution is right, and I'm not conceding that, then surely there is a
guiding hand behind it, and intelligence. It can't just be chance!
I don't accept that. When the black ***(a type of spider... 阅读全帖 |
|
a*******r
发帖数: 7558 | 33 3D Barringer Meteorite Crater
Credit & Copyright: Stefan Seip (Astro Meeting)
Explanation: Barringer Meteorite Crater, near Winslow, Arizona, is one of
the best known impact craters on planet Earth. View this color stereo
anaglyph with red/blue glasses to get a dramatic sense of the crater's
dimensions -- one mile wide, and up to 570 feet deep. (A cross-eyed stereo
pair is available here.) Historically, this crater is the first recognized
to be caused by an impact rather than a volcanic eruption |
|
a*****s
发帖数: 6260 | 34 August 02, 2002
Researchers Publish Latest Results in Continuing Search for Ancient
Martian Life
In the latest study of a 4.5 billion-year-old Martian meteorite,
researchers have presented new evidence confirming that 25 percent of
the magnetic material in the meteorite was produced by ancient
bacteria on Mars. These latest results were published in the journal
Applied and Environmental Microbiology.
The researchers used six physical properties they refer to as the
Magnetite Assay for Biogenicit |
|
s*****t
发帖数: 1994 | 35 The Car, the Hole, and the Peekskill Meteorite
Credit & Copyright: Pierre Thomas (LST), ENS Lyon
Explanation: The Peekskill meteor of 1992 was captured on
16 independent videos and then struck a car. Documented as
brighter than the full Moon, the spectacular fireball crossed parts
of several US states during its 40 seconds of glory before
landing in Peekskill, New York. The resulting meteorite,
pictured here, is composed of dense rock and has the size |
|
L**********O
发帖数: 1761 | 36 http://www.slate.com/id/2276919
Scientists see fatal flaws in the NASA study of arsenic-based life.
By Carl ZimmerPosted Tuesday, Dec. 7, 2010, at 10:53 AM ET
On Thursday, Dec. 2, Rosie Redfield sat down to read a new paper called, "A
Bacterium That Can Grow by Using Arsenic Instead of Phosphorus." Despite its
innocuous title, the paper had great ambitions. Every living thing that
scientists have ever studied uses phosphorus to build the backbone of its
DNA. In the new paper, NASA-funded scienti... 阅读全帖 |
|
a*****s
发帖数: 6260 | 37 【 以下文字转载自 Astronomy 讨论区 】
【 原文由 andrews 所发表 】
August 02, 2002
Researchers Publish Latest Results in Continuing Search for Ancient
Martian Life
In the latest study of a 4.5 billion-year-old Martian meteorite,
researchers have presented new evidence confirming that 25 percent of
the magnetic material in the meteorite was produced by ancient
bacteria on Mars. These latest results were published in the journal
Applied and Environmental Microbiology.
The researchers used six physical properties they |
|
a*****s
发帖数: 6260 | 38 August 02, 2002
Researchers Publish Latest Results in Continuing Search for Ancient
Martian Life
In the latest study of a 4.5 billion-year-old Martian meteorite,
researchers have presented new evidence confirming that 25 percent of
the magnetic material in the meteorite was produced by ancient
bacteria on Mars. These latest results were published in the journal
Applied and Environmental Microbiology.
The researchers used six physical properties they refer to as the
Magnetite Assay for Biogenicit |
|
s*****t
发帖数: 1994 | 39 The Car, the Hole, and the Peekskill Meteorite
Credit & Copyright: Pierre Thomas (LST), ENS Lyon
Explanation: The Peekskill meteor of 1992 was captured on
16 independent videos and then struck a car. Documented as
brighter than the full Moon, the spectacular fireball crossed parts
of several US states during its 40 seconds of glory before
landing in Peekskill, New York. The resulting meteorite,
pictured here, is composed of dense rock and has the size |
|
m***n
发帖数: 12188 | 40 谈论大时间尺度的历史，必须和自然史结合起来。否则就会牛头不对马尾。下面是我做
的一个记录历史事件的 excel文件的一部分拷贝：
只有把整个人类的历史合在一起，而非按地理，民族分类，才能真正听到文明前进的脚
步声，看到“这生命的千军万马，呼啸向前的景象”（参考柏格森《创造的进化》一书
最后一段）。
time events
c 3000000 BC Stone tools S&T
c 1600000 BC most recent ice age begins nature
c 1400000 BC 人类开始用火 use of fire S&T
c 50000 BC a meteorite falls in Arizona, 440,000 tons, and forms a crater
1.2 km wide and 150 m deep nature
c 40000 BC mining, the oldest mine known is at Bomvu R... 阅读全帖 |
|
h******1
发帖数: 16295 | 41 诸位可以古狗Nakhla meteorite.
另外可以去博物馆瞻仰一下这块来自火星,并击中地球上狗头的奇特陨石. |
|
N***Y
发帖数: 2407 | 42 说吃中餐不健康的都被Nakhla meteorite击中头了。 |
|
W***n
发帖数: 11530 | 43 A close-up with a comet
by Staff Writers
Chicago IL (SPX) Nov 12, 2014
On Nov. 12 a robotic lander called Philae is scheduled to touch down on a
comet, following a journey of 10 years and more than 3.7 billion miles. The
mission aims to provide insights into how the solar system evolved, and
whether comet impacts helped form Earth's oceans and brought chemical
precursors of life. (Image courtesy of European Space Agency).
Even as Tom Economou approached retirement age in 1994, he began planning ... 阅读全帖 |
|
R*****i
发帖数: 2126 | 44 所谓人类的核弹能够摧毁地球气候的说法, 根本就是一些科学知识极端欠缺的
人的信口开河. 有谁能找出一篇支持核弹毁灭世界气候的严肃的科学估算的文章? 这个
荒谬说法然后被一些更无知的FQ们东抄西传.
人类核弹的威力和地球已知的大灾难的对比微不足道. 今天全球的核弹当量的
总和, 不及1815年一次火山爆发(450亿吨TNT当量), 当时有三千亿吨的岩石融浆和四亿
吨的含硫毒气被送进大气层, 其对地球气候的影响不大. 至于残留放射性, 今天的一个
大型放射矿的放射性, 就远远超过任何核武器. 下面是一些地球历史上已知的更大灾难
的威力估计.
六千五百万年前的那次大灾难, 远远超过人类的任何可以想象的武器的总威力.
恐龙据说没有活下来, 但是脯乳动物和鸟类却活下来了很多.
在Yucatan半岛上的环形地貌, 是由于一次巨大的撞击形成的, 时间是6千5百
万年前, 其威力相
当于 100万 亿吨TNT, 是人类制造的所有核武器总威力的 2000倍, 人类核武
器的总威力不超
过450亿吨 TNT 当量.
在6500万年前撞击这段时间, 16 %的海洋科和 18%的陆地脊椎动物科 灭绝.
和这样... 阅读全帖 |
|
w*******g
发帖数: 9932 | 45 video is real but not missile since no missile is fast enough to intercept
from behind the meteorite. head on is possible but that is not what the
video shows. besides, Russian won't give up any chance to tout their weapons
. why deny it if it is true |
|
F***Q
发帖数: 6599 | 46
better make your assumption based on something solid, otherwise, anything
can happen (I can think of earthquake, tornado, meteorite, wild fire ...) |
|
e****i
发帖数: 2152 | 47 brought nflx at 93.50 ah X 100
the price dropped like meteorite
brought nflx 300X86.51
300 X 86.31
sold all at 87.44 to almost broke even... |
|
m****a
发帖数: 189 | 48 hahahaha...
this is funny~~
the |
|
a*******r
发帖数: 7558 | 49 when walking/driving be aware of meteor.... |
|
B****n
发帖数: 11290 | 50
when swimming/diving be aware of alligator.... |
|
