Category: Kids Stuff

Abel 2218—a gravitationally-lensed cluster of galaxies that is a great target for deep-sky astrophotograhy. Image credit: NASA, ESA, and Johan Richard (Caltech). Acknowledgement: Davide de Martin & James Long (ESA/Hubble). By Dr. Ethan Siegel As we look at the universe on larger and larger scales, from stars to galaxies to groups to the largest galaxy …

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Image credit: NASA’s Pioneer Venus Orbiter image of Venus’s upper-atmosphere clouds as seen in the ultraviolet, 1979   By Dr. Ethan Siegel   When you think about the four rocky planets in our Solar System—Mercury, Venus, Earth and Mars—you probably think about them in that exact order: sorted by their distance from the Sun. It …

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Image credit: composite of 25 images of the sun, showing solar outburst/activity over a 365 day period; NASA / Solar Dynamics Observatory / Atmospheric Imaging Assembly / S. Wiessinger; post-processing by E. Siegel.   The Power of the Sun’s Engines By Dr. Ethan Siegel   Here on Earth, the sun provides us with the vast …

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