SpaceX launched a mystery satellite to geostationary transfer orbit (GTO) from Florida's Space Coast early Sunday morning ...

Thanks to atomic clocks (and all the worldly forces that influence them), scientists know that Earth's rotation has begun to ...

The Milwaukee M18 Random Orbital Sander is now just $95, which is 42% off its normal $162 price. It's one of the best discounts all year on an item that has earned over 2,600 perf ...

Orbital mechanics can be a bit counter-intuitive. We have to slow down an orbiting space craft to convert kinetic energy for gravitational energy. The orbital altitude is raised at its highest point ...

But on average, Earth's orbital speed is about 19 miles per second (30 km per second). That's about 600 million miles (1 billion km) every year.

Following the impact, NASA says, the small asteroid's, or moonlet's, orbital speed should change by a fraction of a percent, which would lead to an orbital period that's several minutes slower.

Using the UVES spectrograph on the VLT they measured their orbital speed, and noticed that their orbits change over time.

Terran Orbit has demonstrated a record-breaking 200-gigabit orbital data link that finally allows high-bandwidth data transfer from space to Earth. It'll replace antique, low-bandwidth X-band ...

Varying revolution times are due to each planet's distance from the sun and its orbital speed.

And a 10-cm projectile strike at orbital speed is comparable to an explosion of 7 kilograms of TNT.