Earth formed only 4.5 billion years ago, so we can see quasars shining where the light had left before the Earth even formed. The closest is 2.5 billion light years away, but there are many much further out. Some of the brightest objects in the sky are quasars, actively feeding supermassive black holes at the cores of galaxies. Here’s where it gets even more interesting. There are galaxies out there, where aliens with powerful enough telescopes could be watching dinosaurs roaming the Earth, right now. That light left Andromeda before we had Homo Erectus on Earth. That galaxy is more than 2.5 million light-years away. Credit: Adam EvansĪnd don’t get me started on Andromeda. When you look at these beautiful pictures of the core of the Milky Way, you’re seeing light that may well have left before humans first settled in North America. The core of our own Milky Way galaxy is about 25,000 light-years away. Take a picture with a telescope and you’ll see them, but mostly likely they’ve been gone for thousands of years. Astronomers believe that a supernova has already gone off in this region, blasting them away. The Eagle Nebula with the famous Pillars of Creation, is 7,000 light-years away. (Image credit: Karl Tate, ) The moon's rocky mantle is about 825 miles (1,330 km) thick and made up of dense rocks rich in iron and. They will, however, as of when this video was produced, be watching Toronto make some questionable life choices regarding its mayoral election. The moon likely has a very small solid iron core. The lunar cycle lasts about 29.5 days, just under a calendar month. This means that the Proxima Centurans don’t know who won the last US Election, or that there are going to be new Star Wars movies. Moon phases happen at a specific moment in time, while the time between these moments are the intermediate Moon phases. The closest star, Proxima Centauri, is more than 4.2 light-years away. A Hubble Space Telescope image of Proxima Centauri, the closest star to Earth. If we had a telescope strong enough to watch the close encounter, we’d be looking at events that happened 4.6 hours ago. When NASA’s New Horizons spacecraft reaches Pluto next year, it’ll be 4.6 light hours away.
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