Tag: Navigate

Polar Asterisms

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Have you ever seen the North star, Polaris? It’s decently bright and very close to the North celestial pole.  Lining up with the rotation axis of the Earth, the North celestial pole is the point in the sky that never moves, day or night.  If you know how to find Polaris, it becomes easy to find the cardinal directions and navigate by the stars. And finding it simply requires finding the big dipper, a bright and easily recognizable object.  The same rules apply in the southern hemisphere.  But even though there is no southern star, there is another fantastic object in the South that can guide you to the...

Navigating the Cosmic Ocean

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Beyond the atmosphere, past the stars we see, farther than the Milky Way, and continuing past Andromeda, we reach the real cosmic ocean.  So called because like an ocean on Earth, it is vast, homogeneous, and impossible to navigate by common sense alone.  In the cosmic ocean, an impossibly huge amount of space separates island galaxies, whose strong gravity binds them across incredible distances, dictating their course, and forming the largest and most massive structures in the universe: galaxy clusters. Because these immense structures are so vast and so distant, it requires the work of several telescopes to map out...