Ce n’est pas le fait que Polaris est une etoile variable qui m’a surpris, mais plutot ceci:

"Also, because of the wobbling motion of the Earth’s axis (precession), Polaris will not always be a pole star. It will be closest to the sky’s north pole on March 24, 2100 AD. As time passes, it will then be farther and farther from the celestial pole. In about 12,000 years, our descendants will have the beautiful blue-white star Vega as their Polaris."

Wow, Vega… ca c’est une etoile polaire digne de ce nom! 🙂

Polaris, aka the North Star, is getting brighter | EarthSky.org

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