Some worlds, however, have more elongated orbits. The degree of elongation, known as eccentricity, is measured on a scale of 0 (for a perfect circle) to 1 (a hyperbola). Earth's orbital eccentricity ...

The distance between Earth and Mars changes constantly due to their orbits, and the technology used to propel spacecraft plays a significant role in determining travel time. In this article ...

Planetary oppositions for planets such as Jupiter and Uranus are near-annual, but the difference between Earth and Mars’s orbits (Mars orbits the sun every 687 days) means that Mars opposition is less ...

Planetary oppositions for planets such as Jupiter and Uranus are near-annual, but the difference between Earth and Mars’s orbits (Mars orbits the sun every 687 days) means that Mars opposition ...

“There's no enforcement mechanism,” says Pelton. The commentary concludes by advocating for change — both for the ocean floor and the Earth, Moon, and Mars’ orbits. “We need to recognize the pollution ...

The sun's distance from Earth changes throughout ... do with the observation of orbits of other planets. "In about 1604, Johannes Kepler fitted an ellipse model of Mars' orbit to observations ...