* Astronomy

Antarctica Day was inaugurated in 2010 to celebrate the 1st December 1959 signature of the Antarctic Treaty, which was adopted "with the interests of science and the progress of all mankind." Antarctica Day was initiated by the Foundation for the Good Governance of International Spac...

The Xingyang (H6) meteorite fell in Henan, China, on the 1st December, 1977. A total mass of 75.5 kg was recovered. 32° 20'N, 114° 19'E

The Witsand Farm (LL4) meteorite fell in Karasburg, Namibia, on the 1st December, 1932. A total mass of 66 g was recovered. 28° 40'S, 18° 55'E

The Jelica (LL6) meteorite fell in Serbia, Serbia and Montenegro, on the 1st December, 1889. A total mass of 34 kg was recovered. 43° 50' 0"N, 20° 26' 30"E

2008 KT Earth Impact Risk SummaryTorino Scale (maximum) Palermo Scale (maximum) -7.05Palermo Scale (cumulative) -6.23Impact Probability (cumulative) 2.9e-05Number of Potential Impacts 51 Vimpact 11.55 km/sVinfinity 3.03 km/sH 28.3Diameter 0.008 kmMass 5.9e+05 kgEnergy 9.3e-03 MTall...

The Guadalupe Caracara, Caracara lutosa, is an extinct bird of prey belonging to the falcon family (Falconidae). It was, together with the closely related Crested and Southern Caracara, formerly placed in the genus Polyborus. It was also known as the Quelili or the Calalie Read more

Stephen A. Benton (1941-2003) was a Massachusetts Institute of Technology professor and the inventor of the rainbow hologram and a pioneer in medical imaging and fine arts holography. Read more

Nikolai Ivanovich Lobachevsky (December 1, 1792 - February 24, 1856 (N.S.); November 20, 1792 - February 12, 1856 (O.S.)) was a Russian mathematician and geometer, renowned primarily for his pioneering works on hyperbolic geometry, otherwise known as Lobachevskian geometry. Read more

World AIDS Day, observed December 1 each year, is dedicated to raising awareness of the AIDS pandemic caused by the spread of HIV infection. Read more

Sunspots 11625, 11623 and 11621 captured with a 100mm refractor and Vesta pro webcam + solar filter

Dark Matter Core Defies Explanation in Hubble Image Astronomers observed what appeared to be a clump of dark matter left behind during a bizarre wreck between massive clusters of galaxies. The dark matter collected into a "dark core" containing far fewer galaxies than would be expecte...

Title: Binary mass ratios: system mass not primary mass Authors: Simon P. Goodwin (Sheffield) Binary properties are usually expressed (for good observational reasons) as a function of primary mass. It has been found that the distribution of companion masses -- the mass ratio distribution -- is d...

Ash spews from Guatemala's Santa Maria volcano There has been increased activity in Guatemala's Santa Maria volcano which lies 200kms (124 miles) west of the country's capital. Read more

Ernst Florens Friedrich Chladni (30 November 1756 - 3 April 1827) was a German physicist and musician. His important works include research on vibrating plates and the calculation of the speed of sound for different gases. For this some call him the "Father of Acoustics". He also did pio...

Nils Gustaf Dalén (30 November 1869 - 9 December 1937) was a Swedish Nobel Laureate and industrialist, the founder of the AGA company and inventor of the AGA cooker and the Dalén light. Read more