http://hubblesite.org/explore_astronomy/tonights_sky/
Did you know that the largest stars have the shortest life span (still billions of years)? More massive stars burn hotter and faster than their smaller counterparts (like the Sun).
Or that stars twinkle when we see them from the Earth's surface because we are viewing them through thick layers of turbulent (moving) air in the Earth's atmosphere?
Stars (except for the Sun) appear as tiny dots in the sky; as their light travels through the many layers of the Earth's atmosphere, the light of the star is refracted many times and in random
directions (light is bent when it hits a change in density - like a pocket of cold air or hot air). This random refraction results in the star winking out (it looks as though the star moves a bit, and our eye interprets this as twinkling).
The universe is amazing! And this is an interesting site!! You can see, for example:
the March constellations (Gemini and Cancer),
March deep sky objects ("The cloudy star"),
March planets (Saturn, that is the only "star" that doesn`t twinkle),
and March events (The Equinox).
1 comentario:
You are paraphrasing a lot. Not that is not good, just keep it more personal Ok?
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