News

Pioneer 10 reaches Jupiter (1973)

posted Wednesday, 3 December 2014

3 December 1973: Pioneer 10 sends back the first close up pictures of Jupiter.

physics.info/news/?p=778

Pioneer 11 reaches Jupiter (1974)

posted Tuesday, 2 December 2014

2 December 1974 : Pioneer 11 reaches Jupiter

physics.info/news/?p=734

Robert Byrd first to fly over South Pole (1929)

posted Saturday, 29 November 2014

29 November 1929: Robert Byrd first to fly over South Pole

physics.info/news/?p=733

Royal Society Founded (1660)

posted Friday, 28 November 2014

The origins of the Royal Society lie in an “invisible college” of natural philosophers who began meeting in the 1640s to discuss the ideas of Francis Bacon. Its official foundation date is 28 November 1660, when 12 of them met at Gresham College after a lecture by Christopher Wren and decided to found “a Colledge for the Promoting of Physico-Mathematicall Experimentall Learning.” This group included Christopher Wren, Robert Boyle, John Wilkins, Robert Moray, and William Brouncker.

physics.info/news/?p=732

Louis de Broglie’s doctoral thesis accepted (1924)

posted Tuesday, 25 November 2014

Louis de Broglie, “Recherches sur la théorie des quanta”, Thèse de doctorat soutenue à Paris le 25 novembre 1924.

physics.info/news/?p=2825

Michael Faraday describes electromagnetic induction (1831)

posted Monday, 24 November 2014

Michael Faraday announced the discovery of electromagnetic induction on this day in 1831.

§ 2. Evolution of Electricity from Magnetism.

27. A welded ring was made of soft round bar-iron, the metal being seven-eighths of an inch in thickness, and the ring six inches in external diameter. Three helices were put round one part of this ring, each containing about twenty-four feet of copper wire one twentieth of an inch thick; they were insulated from the iron and each other, and superposed in the manner before described (6.), occupying about nine inches in length upon the ring. They could be used separately or conjointly; the group may be distinguished by the letter A (Pl. I. fig. 1.). On the other part of the ring about sixty feet of similar copper wire in two pieces were applied in the same manner, forming a helix B, which had the same common direction with the helices of A, but being separated from it at each extremity by about half an inch of the uncovered iron.

28. The helix B was connected by copper wires with a galvanometer three feet from the ring. The helices of A were connected end to end so as to form one common helix, the extremities of which were connected with a battery of ten pairs of plates four inches square. The galvanometer was immediately affected, and to a degree far beyond what has been described when with a battery of tenfold power helices without iron were used (10.); but though the contact was continued, the effect was not permanent, for the needle soon came to rest in its natural position, as if quite indifferent to the attached electro-magnetic arrangement. Upon breaking the contact with the battery, the needle was again powerfully deflected, but in the contrary direction to that induced in the first instance.

29. Upon arranging the apparatus so that B should be out of use, the galvanometer be connected with one of the three wires of A (27.), and the other two made into a helix through which the current from the trough (28.) was passed, similar but rather more powerful effects were produced.

30. When the battery contact was made in one direction, the galvanometer-needle was deflected on the one side; if made in the other direction, the deflection was on the other side. The deflection on breaking the battery contact was always the reverse of that produced by completing it. The deflection on making a battery contact always indicated an induced current in the opposite direction to that from the battery; but on breaking the contact the deflection indicated an induced current in the same direction as that of the battery. No making or breaking of the contact at B side, or in any part of the galvanometer circuit, produced any effect at the galvanometer. No continuance of the battery current caused any deflection of the galvanometer-needle. As the above results are common to all these experiments, and to similar ones with ordinary magnets to be hereafter detailed, they need not be again particularly described.

Michael Faraday, 1831

Drawing of Faraday's Apparatus Photo of Faraday's Apparatus
[magnify] [magnify]

physics.info/news/?p=4428

Evolution Day (Origin of Species published in 1859)

posted Monday, 24 November 2014

Evolution Day is the anniversary of the first publication of The Origin of Species on 24 November 1859.

Charles Darwin’s On the origin of Species by means of natural selection, or the preservation of favoured races in the struggle for life first appeared on 24 November 1859 and was sold out that very same day. The publisher had been skeptical and had printed only 1250 copies. "Next time write about pigeons, a subject everybody is interested in" he had told Darwin. The word "evolution" is used for the first time only in the sixth edition of the book. The term "descent with modification" is the forerunner of evolution. Even today On the Origin is still being published.

physics.info/news/?p=362

RDS-37: First Soviet thermonuclear weapon test (1955)

posted Saturday, 22 November 2014

Date: 22 November 1955
Code Name: RDS-37 or “Kuzka’s Mother”
Type: two-stage fusion
Yield: 1,600 kilotons of TNT
Location: Semipalatinsk, Kazakhstan

RDS is a transliteration of the Russian РДС, which stands for Реактивный Двигатель Сталина, Reaktivniy Dvigatel’ Stalina, or “Stalin’s Jet Engine”.

physics.info/news/?p=645

Verrazano Narrows Bridge opened to traffic (1964)

posted Friday, 21 November 2014

On the day it opened the Verrazano Narrows Bridge was the world’s longest suspended span.

New York Times front page

physics.info/news/?p=2773

Luna 17 lands on the moon, Lunokhod 1 drives away (1970)

posted Sunday, 16 November 2014

Lunokhod 1 was the first roving remote-controlled robot to land on another celestial body. It rolled off the Luna 17 lander two and a half hours after landing and operated for nearly 10 months from November 1970 to September 1971. Although equipped with a laser retroreflector array, was “lost” at the end of the mission and wasn’t relocated until 22 April 2010. More importantly, it looked like a bathtub with eyes.

Lunokhod 1

physics.info/news/?p=715