NY to Chicago = 1,271 km
Chicago to NY = 1,271 km
January to December = 12 months
December to January = 12 months
Ground Floor to 15th Floor = 15 floors
15th Floor to Ground Floor = 15 floors
Monday to Sunday = 6 days
Sunday to Monday = 1 DAY!!
Image credit: Rizwan Elias
Grote ReberBorn 22 Dec 1911; died 20 Dec 2002 at age 90. U.S. amateur astronomer and radio engineer who self-financed and built the first radio telescope. He pioneered the new field of radio astronomy, and was the first to systematically study the sky by observing non-visible radiation. After reading about Jansky's discovery (1932) of natural radio emissions from space, Reber constructed a 9-meter dish antenna in his back yard and built three different detectors before finding 160 MHz signals (1939). In 1940 and 1944 he published articles titled Cosmic Static in the Astrophysical Journal. He was the first to express received radio signals in terms of flux density and brightness, first to find evidence that galactic radiation is non-thermal, and first to produce radio maps of the sky (1941).« |
