The composition of particles in the air can block certain wavelengths of light, creating a "foreboding" sky that "looks like Mars," according to some residents.

To understand how smoke from Canadian wildfires is turning skies in many places orange this week, it helps to first ask: Why is the sky usually blue? The scientifically jargony answer: atmospheric ...

So, that orange hue was actually produced by the same process that causes sunsets. Sunsets and sunrises happen because of the light passing through the Earth’s atmosphere.

SAN DIEGO — People across San Diego County are reporting an unidentified bright orange light shooting across the sky Thursday night. Some residents believe it's an asteroid or shooting star ...