Earth’s orbit around the Sun is not circular, but an ellipse. The perimeter of Earth’s orbit is roughly 584 million miles ...

“Our dynamical models indicate that K2-360 c could have pushed the inner planet into its current tight orbit through a ...

An international team of scientists has found a fascinating new planetary system around a star similar to our sun. The system ...

An international team led by researchers in Japan and Europe has discovered a new multi-planet system around a sun-like star, ...

There’s a final Super Moon this coming weekend – it’s the last in a sequence of four. First, we need some background as to ...

There's nothing innate about the Earth or its atmosphere that marks the boundaries of low Earth orbit. This is a distinction ...

A 128-minute orbit, according to Kepler's third law, works out to a semi-major axis of 8,413 km (5,228 mi). Such an object with less than 0.25 eccentricity (a roughly circular orbit), therefore ...

Earlier this year, astronauts Butch Wilmore and Suni Williams were sent into orbit on a Boeing Starliner. What initially looked like a feel-good storyline for the company has turned into something ...

“To find evidence of an ocean inside a small object like Miranda is incredibly surprising,” said Tom Nordheim, a planetary ...

The permissible degree of eccentricity can be expressed by a plus and minus wall thickness tolerance. If you have any comments or questions about the glossary, please contact Dan Davis, ...

NASA's technology-demonstrating Advanced Composite Solar Sail System (ACS3) has a bent boom in Earth orbit, a newly released photo shows. The ACS3 spacecraft launched April 23 to test key aspects ...

These five satellites are the largest commercial communications arrays ever launched in low Earth orbit," commented Abel Avellan, Founder, Chairman and CEO of AST SpaceMobile. "It is a significant ...