When the sun is straight up at noon, you see blue sky because all the other colors in the spectrum up until blue and purple are scattered away. This is known as the Rayleigh effect. We usually don't see purple because our eyes are in tune to see blue and red. With red being scattered away, we end up seeing blue.

Look low on the southwestern horizon at sunset on Nov. 12 for a chance to see swift Mercury close to the red light of Mars in the evening sky, but fair warning — you'll need to be quick to spot the elusive planets before they slip quickly out of sight.

Mercury will be farthest from the sun on Tuesday (Aug. 19), granting early risers a perfect opportunity to spot the fleet-footed world somewhat separated from the glare of our parent star. Mercury treads such a tight orbit around the sun that it never ...

I have been roaming the entirety of the United States of America over the past many months transversing cities, countryside, desserts, beaches, downtowns and have observed that only a few things capture the vastness

It will be a pleasant and chilly evening for Halloween with temperatures falling as soon as the sun gets low in the sky. Expect temperatures to be in the 50s during the evening hours and 40s overnight.