Wikipedia:Reference desk/Science: Difference between revisions

:It was under 130 km altitude perigee in the South Pacific shortly after it passed over New Zealand around Midnight Eastern. That would have had to have snagged it, the air is just too dense. [[Special:Contributions/208.54.86.178|208.54.86.178]] ([[User talk:208.54.86.178|talk]]) 16:30, 24 September 2011 (UTC)

::::The latest reports are still inferential. They think it fell in the Pacific, because it's altitude was dropping. and it did not seem to have reached North America. They have not reported any actual radar measurements of when and where it reentered. There appear to be spots on Earth where they can measure the apogee and perigee and location of orbiting objects. but there are also apparently large gaps, somewhat worrisome when ballistic missile subs or surface ships might launch from anywhere. Satellites looking down might be able to detect launches. NASA was relying on "amateur satellite watchers," who failed to see it, so by inference it fell in the Pacific. Recent news reports, [http://www.latimes.com/news/nationworld/nation/la-na-nasa-satellite-20110925,0,3623009.story], say they are hoping for reports from airliners or ships of fireball sightings. If someone like the North Koreans fired an ICBM at the US, would they be similarly unable to track it by radar? [[User:Edison|Edison]] ([[User talk:Edison|talk]]) 03:39, 25 September 2011 (UTC)

 

== Why don't plants have white blood cells? ==