Saints du jour
Martyre. Mise à mort à Brescia où se trouvent ses reliques mais l'histoire est plus discrète que la légende.
Données astronomiques
Dicton du jour
« À la sainte Olive, ne verra point la grive. »
Citation du jour
Il y a des gens qui n'auraient jamais été amoureux s'ils n'avaient jamais entendu parler de l'amour.
Le 5 mars dans l'histoire
À la une le 5 mars 1926 — il y a 100 ans
Image astronomique du jour
Shapley 1: An Annular Planetary Nebula
What’s looking back at you isn’t a cosmic eye, but Shapley 1, a beautifully symmetric planetary nebula. Shapley 1, also known as the Fine Ring Nebula or PLN 329+2.1, bejewels the southern sky constellation of the Carpenter's Square (Norma). The nebula is the result of a star near the mass of our Sun running out of fuel and shedding its outer layers. Glowing oxygen from those expelled layers makes up the circular halo. The bright central point is actually a binary: a white dwarf, the remaining stellar core after the outer layers are expelled into space, and another star, orbiting each other every 2.9 days. Shapley 1’s annular shape is due to our top-down view of the system and provides insight into the influence of central stars on planetary nebula structures.