Eclipses occur when the Earth, moon and sun line up. A total solar eclipse will pass over the U.S. on the afternoon of April 8, cutting a narrow path across 13 states from Texas to Maine. Millions ...

Let's say we want to build a model of the sun and Earth alone. Earth has a radius of about 6,371 kilometers (3,959 miles), but let's represent this with a marble 1 centimeter in diameter.

When the Earth, Moon, and Sun perfectly align during the new Moon, a solar eclipse will result. But ... More whether that's annular, total, or hybrid depends on the Moon's distance from Earth.

The Moon's phases are caused by changing amounts of sunlight reflecting off its surface as it orbits Earth. Lunar eclipses happen during a Full Moon when Earth is between the Sun and Moon. Solar ...

Not only will Friday’s total lunar eclipse be a Blood Moon, but it also lands on Pi Day! Grab a blanket—it won’t be freezing, but it will be in the 40s.

Learn the differences between our Earth, the Sun and the Moon. Then explore how together they create day and night and our different seasons with their orbits.

The moon has fascinated humans for millennia. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The moon is Earth's most constant companion ...