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Astro Photo Météo 53
- 11 mars 2018
- 2 Min
Transit
En astronomie, un transit désigne le passage d'un corps céleste devant un autre, comme Mercure ou Vénus devant le Soleil, ou les lunes de Jupiter devant la planète géante. En général, pour un observateur terrestre, le transit consiste donc en l'alignement de trois points, par exemple : la Terre, une étoile (ici le Soleil), sa planète (ici Mercure ou Vénus). Le phénomène s'observe aussi pour d'autres systèmes stellaires. Les astronomes s'en servent pour détecter des exoplanète
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