See the Kepler data release schedule. Exoplanet Archive Kepler Resources General Documentation . Kepler Extended Mission data philosophy; How to request a Kepler number; How to request a K2 number; Search for a Kepler light curve; K2 Mission page
Radium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample. While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive.
Let us look at the discovery of the elements polonium and radium: they were tentatively announced by the team of Pierre Curie, Marie Curie, and Gustave Bemont in 1898.It was four more years, however, until Marie Curie was able to isolate a pure enough sample of radium to measure some of its properties.er husband, Pierre Curie, a physicist at the University, was her partner in the work until his death in 1906. The first step was to look at the source of the radiation. It was known that materials containing compounds of uranium and thorium were radioactive (a term coined by Marie Curie).