Search results
Results from the WOW.Com Content Network
First amateur radio satellite OSCAR 1, launched in 1961 Simple OSCAR beacon signal, 1962. The first amateur satellite, simply named OSCAR 1, was launched on December 12, 1961, barely four years after the launch of the world's first satellite, Sputnik I. The satellite had to be built in a very specific shape and weight, so it could be used in ...
The cgs units of spectral radiance B ν are erg·s −1 ·sr −1 ·cm −2 ·Hz −1. The terms B and u are related to each other by a factor of 4π / c since B is independent of direction and radiation travels at speed c. The spectral radiance can also be expressed per unit wavelength λ instead of per unit frequency. In addition, the ...
In April 1971 the Salyut 1 space station carried Orion 1, the "first space telescope with an objective prism, into orbit." In December 1973 the crewed Soyuz 13 mission operated the "Orion-2 ultraviolet Cassegrain telescope with a quartz objective prism built in the Byurakan Observatory. Spectra of thousands of stars to as faint as thirteenth ...
The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres (100m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.
The former president has had some success in making inroads among Black male voters as he seeks to undermine the Democratic coalition and his past support for Robinson will be seen through that prism.
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 September 2024. Discrepancy between lack of evidence of advanced alien life and apparently high likelihood it exists This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is ...
Polyhedron. In geometry, a polyhedron (pl.: polyhedra or polyhedrons; from Greek πολύ (poly-) 'many' and ἕδρον (-hedron) 'base, seat') is a three-dimensional figure with flat polygonal faces, straight edges and sharp corners or vertices. A convex polyhedron is a polyhedron that bounds a convex set.
Vajira Chitrasena, 92, Sri Lankan choreographer. [3] (death announced on this date)Tomris Giritlioğlu, 67, Turkish film director (Mrs. Salkım's Diamonds, Pains of Autumn) and producer, cancer.