| | | September 26 Lost Spanish Stonehenge Revealed | | | |
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 | | This 7,000-year-old stone monument is called the Dolmen of Guadalperal. After 50 years underwater, it resurfaced in 2019 due to record heat and drought in Europe. Image via NASA Earth Observatory. Read more. | | |
| | Drought reveals a lost Spanish Stonehenge | | | The Dolmen of Guadalperal - sometimes called the Spanish Stonehenge - is a 7,000-year-old circle of 150 upright stones, now back on dry land in western Spain after 50 years underwater. It was first unearthed and studied in the 1920s. The 1963 construction of the Valdecañas Dam flooded this region of western Spain, submerging it. Now, after a hot and dry summer in Europe, the monument is fully exposed again. "When we saw it, we were completely thrilled, said Angel Castaño, president of a group trying to preserve it. "It felt like we had discovered a megalithic monument ourselves." Read more. | | | | Using 3-D models in the search for Mars life | | | Maps are handy for travel. But what if you're traveling to a place never before visited? For the ExoMars mission, due to launch next summer, scientists used data from Mars orbiters to create 3-D models of the region to be explored. This region - called Oxia Planum - might even contain an old river delta. Who knows what we'll find there? Read more. | | | | IAU names the 2nd interstellar visitor | | | The first known interstellar visitor received the official name 'Oumuamua, meaning scout. This one has a less romantic name and one that sets a standard for future discoveries: 2I/Borisov. Read more. | | | | | |
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|  | | | Hazy pyramid of light in the east? False dawn | | If you're in the Northern Hemisphere, you can see the zodiacal light, or false dawn, at this time of year. If you're in the Southern Hemisphere, look for it after sunset. Read more. This photo is from Jeff Dai. See more from Jeff at EarthSky, and visit him at TWAN. | | | | | |
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 | | Using 3-D models in the search for Mars life | | Here's a piece of one of the new 3-D models just created to help ESA’s Rosalind Franklin rover - part of ESA's ExoMars mission, due to launch next summer - explore Mars in 2021. The models are so detailed that they show, for example, dune ripples inside craters, as you see here. Image via TU Dortmund/ NASA/ JPL-Caltech/Europlanet. Read more. | | |
