Scientists have long debated the origins of Earth's water. Some believe that it came from comets and asteroids that crashed into the planet early in its history. Others believe that it was created on Earth from the chemical reactions of hydrogen and oxygen in the atmosphere. A new study published...
The first Father's Day was celebrated in Spokane, Washington, on June 19, 1910. It was the brainchild of Sonora Smart Dodd, a young woman who was inspired to create a holiday to honor her father, William Jackson Smart. Smart was a Civil War veteran who raised his six children on...
Redshift and blueshift are two phenomena that describe how the frequency of light changes when an object is moving relative to an observer. When an object is moving away from an observer, the light from the object is redshifted, which means that the wavelength of the light increases and the...
