How to Observe and Measure Naked-eye Sunspots

As Solar Cycle 25 ticks up, naked-eye sunspots are becoming more frequent. They’re not only fun to observe, but with this simple method you can determine just how big they are. We also have news on a bright supernova! The post How to Observe and Measure Naked-eye Sunspots appeared first on Sky & Telescope.

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New Target for Asteroid Probe: “Potentially Hazardous” Apophis

Once the primary mission of NASA’s OSIRIS-REx is complete, the spacecraft will head toward a new destination: near-Earth asteroid Apophis. The post New Target for Asteroid Probe: “Potentially Hazardous” Apophis appeared first on Sky & Telescope.

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