April skygazing: A pink micromoon, the Lyrid meteor shower, and more
In North America, the galaxy will become visible 41° above the north-eastern horizon at around 8:30 p.m. EDT, and continue ...
How Edwin Hubble Proved the Universe Is Bigger Than We Thought
A century ago, Edwin Hubble revolutionized our understanding of the universe by proving that the Milky Way is just one of many galaxies in an ever-expanding cosmos. This breakthrough led to the ...
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One large Milky Way galaxy or many galaxies? 100 years ago, Edwin Hubble settled astronomy's 'Great Debate'
Hubble's work opened the door to the study of ... in Messier's catalog—while others were star clusters such as the Pleiades, or M45. A third category—nebulae with spiral structure ...