Aconteceu a 19 de junho

 1731 - Nasce Machado de Castro      Faleceu a 17 de Novembro de 1822

A 19 de Junho de 1731, nasce, em Coimbra, o escultor português Joaquim Machado de Castro. A sua obra mais conhecida é a estátua equestre do rei D. José I, no Terreiro do Paço, em Lisboa.

O Leme - Portugal

Astronomy picture of the day - 2015 June 19 - LightSail A

LightSail A 
Image Credit: The Planetary Society

Explanation: Hitching a ride to low Earth orbit, LightSail A accomplished a challenging test mission, unfurling its 32 square meter mylar solar sail on June 7. This dramatic image from one of the bread loaf sized spacecraft's fisheye cameras captures the deployed sail glinting in sunlight. Sail out and visible to Earthbound observers before its final orbit, LightSail A reentered the atmosphere last weekend. Its succesful technology demonstration paves the way for the LightSail B spacecraft, scheduled for launch in April 2016. Once considered the stuff of science fiction, sailing through space was suggested 400 years ago by astronomer Johannes Kepler who observed comet tails blown by the solar wind. But modern solar sail designs, like the one tested by LightSail A, rely on the small but continuous pressure from sunlight itself for thrust.