burst a balloon
21X-ray astronomy — X rays start at 0.008 nm and extend across the electromagnetic spectrum to 8 nm, over which the Earth s atmosphere is opaque. X ray astronomy is an observational branch of astronomy which deals with the study of X ray observation and detection… …
22Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
23Parachute — This article is about the device. For sports involving a parachute, see Parachuting. For other meanings, see Parachute (disambiguation). Parachutes opening A parachute is a device used to slow the motion of an object through an atmosphere by… …
24Downburst — The curl phase soon after an intense microburst impacted the surface Downburs …
25Macy's Thanksgiving Day Parade — The Macy s Thanksgiving Day Parade is an annual parade presented by Macy s Department store. The three hour event is held in New York City starting at 9:00 a.m. EST on Thanksgiving. History In the 1920s many of Macy s department store employees… …
26Airship — For other uses, see Airship (disambiguation). Dirigible redirects here. For the 1931 film, see Dirigible (film). Not to be confused with Balloon (aircraft) or Blimp. Airship …
27Patrick Young Alexander — (28 March 1867 7 July 1943) was a British aeronautical pioneer fascinated by the prospect of heavier than air flight. He was an enthusiastic balloonist and he was also particularly active in meteorology. He performed many metrological and… …
28Radiosonde — A GPS sonde, approx 220 × 80 ×75 mm (8.7 × 3.1 × 3 in) (with grounding station in background, used to perform a ground check and also recondition the humidity sensor) A radiosonde (Sonde is French for probe) is a unit for use in weather balloons… …
29Lighter than air — Some gases are buoyant in air because they have densities lower than that of air (about 1.2 kg/m3, 1.2 g/l). Lighter than air gases are used to fill craft called aerostats, which include free balloons, moored balloons, and airships, to make the… …
30Witness accounts of the Roswell UFO incident — Follows are excerpts of witness accounts of the Roswell UFO incident.In 1978, author Stanton T. Friedman interviewed Jesse Marcel, who voiced his suspicion that debris he recovered on a ranch near Roswell in 1947 was not of this world. Over the… …
