This is one of the most detailed attempts to map our home galaxy, the Milky Way, showing its spiral arms, star-forming regions, clusters and our own location inside it.
The Milky Way stretches roughly 100,000 light-years across and contains hundreds of billions of stars. Earth sits nowhere near the center — our Solar System lies in a smaller structure called the Orion Spur, between the Sagittarius and Perseus spiral arms.
At the center of the map is the galactic core, about 26,000 light-years from Earth. Hidden there behind enormous amounts of gas and dust is Sagittarius A*, the supermassive black hole at the center of our galaxy, with a mass around four million times that of the Sun.
The map also marks familiar objects such as the Pleiades, Orion Nebula and various star clusters, alongside the much larger spiral structures that organize the galaxy.
But there is an interesting catch: nobody has ever photographed the Milky Way from outside. Every spacecraft humanity has built remains deep inside our galaxy.
Maps like this are therefore reconstructions. Astronomers combine measurements of stars, gas clouds, radio emissions, distances and motions to infer what the Milky Way probably looks like from above.
So if you actually got lost somewhere across the galaxy, this map might tell you where Earth is — but reaching it could still require traveling tens of thousands of light-years.
[source]
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