Gravitational lens

Numéro d’image : 11887070
Gravitational lens
Gravitational lens. Diagram showing the principles behind a gravitational lens. Light from a distant star (top left) is bent by the gravitational field of a free-floating planet (black,centre). As the planet passes between the star and the Earth,the focusing of the light causes an increase (peak at lower right) in the star's observed brightness. The duration of this increase reveals the mass of the planet. For small masses,the effect is called microlensing. Gravitational microlensing is a way to detect the non-luminous portion of dark matter. This also includes objects such as neutron stars and black holes (stellar remnants),or brown dwarf stars (small stars that failed to ignite)
Licence : Droits gérés
Crédit: Science Photo Library / Lomberg, Jon
Taille de l’image : 1676 px × 1764 px
Model Release : Non requis
Property Release : Non requis
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