Ice and StoneTopicWeek 09

Few, if any, sights in the nighttime sky are more impressive than that of a bright, long-tailed comet. It is little wonder that our ancestors of just a few centuries ago, who had little idea of what they were actually seeing, were amazed and perhaps even terrified of the sight, and even today the appearance …

Ice and StoneWeek 09Word Games

Do your best to find these words that are scattered throughout the sixth weekly edition of Ice and Stone 2020. Words may be placed horizontally or vertically. Letters in the grid may be used in more than one word, but not all the letters in the grid have to appear in a word.   More from …

EarthJupiter

NASA is planning a mission to look for life on Jupiter’s moon Europa and has created a rover that will be able to navigate its icy surface from above and below. That’s how BRUIE — the Buoyant Rover for Under-Ice Exploration — was born. A nimble and buoyant robot, BRUIE can traverse sheets of ice …

HistoryIce and StoneWeek 08

FEBRUARY 17, 1930:  A bright meteor appears in the sky above the midwestern U.S. and falls to the ground near Paragould, Arkansas. With a total mass of 370 kg, the Paragould meteorite, a stony chondrite, is the second-largest meteorite fall seen from and recovered in North America.  FEBRUARY 17, 1996: The Near-Earth Asteroid Rendezvous (NEAR) …

CometIce and StoneWeek 08

Perihelion: 1846 February 11.49, q = 0.856 AU  The stories of the first two numbered periodic comets, 1P/Halley and 2P/Encke – both of which are future “Comets of the Week” – are well known. The third numbered periodic comet also has an interesting story, but unlike the earlier two, it will likely never be seen …

Ice and StoneTopicWeek 08

Five weeks ago I devoted the “Special Topics” presentation to the subject of the Oort Cloud, the large spherical cloud of comets that is believed to enshroud the solar system out to distances of several tens of thousands of Astronomical Units. The comets in the Oort Cloud have been there since the forming Jupiter and …