[DOC] [TLE] Free Flashcards about ASTRONOMY - StudyStack [PAR] SOME SCIENTISTS SAY THOUSANDS OF THESE, KNOWN AS "DIRTY ... IN 
1996 THE SUN WENT AN EXCEPTIONAL 36 DAYS WITHOUT A VISIBLE ONE 
OF THESE .... JPL SPACECRAFT HAVE VISITED EVERY PLANET IN OUR 
SOLAR ... THE NAME OF THIS LIGHT DISPLAY IN THE EARTH'S 
ATMOSPHERE IS... [DOC] [TLE] Free Flashcards about GENERAL SCIENCE - StudyStack [PAR] SOME SCIENTISTS SAY THOUSANDS OF THESE, KNOWN AS "DIRTY 
SNOWBALLS", STRIKE OUR ATMOSPHERE EVERY DAY, COMETS. 
SCIENTISTS... [DOC] [TLE] The Solar System: Earth - The New York Times [PAR] Scientists Find Way to Gauge Earth's Glow Methods ... reports that a mysterious 
motion known as the "Chandler wobble" is caused ... to dry up, burn up or freeze, 
scientists studying the planet's ultimate fate say. ... (May 29, 1997) Thousands of 
dirty snowballs from outer space are bombarding Earth's atmosphere every day,
... [DOC] [TLE] Asteroids  Facts and Information about Asteroids - Space.com [PAR] Nov 21, 2014 ... They are also called space rocks, planetoids or minor planets. ... In total, the 
mass of all the asteroids is less than that of Earth's moon. ... Scientists estimate 
the asteroid belt also contains more than 750,000 asteroids larger ... Some of 
these, whose orbits come close enough to Earth, could potentially be... [DOC] [TLE] Comets, Asteroids, Meteorites and Impacts [PAR] Some of the orbits aren't even elliptical - the comets just do one passage in 
toward ... I should also mention that each image is separated by one day, 
indicating how ... These include the gas tail (also called the ion tail), which is 
made up of ..... Meteor - when an object from space enters the Earth's 
atmosphere and burns up. [DOC] [TLE] THE SCIENCE OF DOOM - Newsweek [PAR] Nov 22, 1992 ... It hits the atmosphere at 100 times the velocity of a speeding bullet, and less ... 
Thousands of meteorites as big as a lump of coal fall every year, ... "Sooner or 
later, our planet will be struck by one of them."Unless, of course, some other 
dreadful fate strikes first. ... And those are only the ones we know about. [DOC] [TLE] Evidence discovered of comet entering Earth's atmosphere and ... [PAR] Oct 8, 2013 ... Scientists say first-ever fragment of a comet hitting Earth found ... Witwaterstrand 
say the first definitive proof of a comet striking Earth millions of years ... "Comets 
always visit our skies -- they're these dirty snowballs of ice mixed with ... in the 
upper atmosphere and some carbon-rich dust in the Antarctic ice. [DOC] [TLE] Meteorite Crater - The shape of the land, Forces ... - Science Clarified [PAR] There are more than 160 known meteorite craters on the surface of Earth . ... 
Once a meteoroid enters Earth's atmosphere, it becomes heated due to friction 
and begins to glow. ... The energy of the impact typically causes some rocks to 
melt. ... Scientists watch NEOs to determine which, if any, might one day strike 
Earth. [DOC] [TLE] Chapter 3 [PAR] After a few more days of research that involved digging up ... out to buy a hard hat
, you should know that few of these cosmic .... worth thousands of dollars per 
gram. ... Some scientists have suggested that .... long been compared to dirty 
snowballsthat is, mainly ice with .... of meteors strike Earth's atmosphere each 
year. [DOC] [TLE] Picture of the Day Archive Sub-Page - jmccanneyscience.com : How ... [PAR] i try to keep up on all these daily posts but until i clone myself about 18 times i will 
miss .... below is the so called Kepler 62 system which has some planets in the ... 
our own moon sports an extended comet tail containing mainly sodium one of ... 
tails ... how can scientists continue to call these "dirty snowballs" and expect you
... [DOC] [TLE] Our Busy Solar System - NEO IMPACT SYMPOSIUM [PAR] Feb 25, 2003 ... And our scientists are often unscientific, because they're neglecting the ... Even 
when panic does happen, say at soccer matches, focusing

Question: Some scientists say thousands of these, known as "dirty snowballs", strike our atmosphere every day
Answer: comets