sun – Page 3 – National Radio Astronomy Observatory

Viewing the Sun with Welding Glasses

First of all, it is important to note that you should only use glasses made with lens material rated…

The Northern Lights (Aurora Borealis/Australis) are only visible at night (or, strictly speaking, when the Sun is not up…

Let’s do the calculation using atomic mass units (u) for the Hydrogen and Helium atoms involved. H = 1.00784…

I believe that this question has been addressed in a previous answer to a question about the Orbital Period…

I found two satellite systems that appear to measure EUV emission. The Ionospheric Connection Explorer (ICON) and the Geostationary…

In fact, Winter Solstice, which occurs in the northern/southern hemisphere when the Sun’s path is at its furthest south/north…

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