But then retreats beyond the orbit of Venus to "cool down ... Earth's seasons are dictated by the tilt of Earth's axis toward the planet's orbital plane. How did astronomers discover that ...

Our Solar System is a carefully balanced celestial dance held together by a virtually perfect balance of gravity and inertia.

This discrepancy is due to the Earth's tilt and the fact that our planet does not orbit the sun in a perfect circle or at the same speed all year. "Because we're in this elliptical orbit ...

However, the moon's orbit around Earth is tilted about 5 degrees relative to Earth's orbit around the Sun. This is why lunar eclipses don't occur every full moon—they only happen when the moon's ...

Researchers have discovered an Earth-like planet with such an eccentric orbit that it swoops in and out of its habitable zone throughout its year. Though the super-Earth could theoretically be ...

By Valentine's Day, the sun rises at 6:54 a.m. and sets at 5:44 p.m., giving us 10 hours and 50 minutes of sunlight. And then ...