The famous star Betelgeuse is dimmer than anyone has seen it in a century.

This is the very finest test of vision in all the heavens.

Moonlight is at its brightest. Let’s celebrate that by giving it some attention during this lunation. Copernicus, a magnificent, isolated crater with terraced walls, is regarded by many as the Moon’s most handsome feature. It’s now at its best.

Since cold air can hold just one-thirtieth as much water vapor as very warm air, the substance we breathe is becoming desiccated.

This setup typically lets cold polar air pour into the Northeast, and can set the stage for early snowstorms.