Most planetary systems contain worlds larger than Earth but smaller than Neptune, and the low-density planets around one ...

Humanity has long wondered if we are being watched from the stars, but the answer might lie in our own exhaust fumes. As the ...

Astronomers study planetary transits and atmospheric signals using interstellar object 3I/ATLAS, drawing on transit spectroscopy principles and recent observational constraints discussed by Avi Loeb.

Polar dunes on Mars, swirling clouds on Jupiter, and stunning sights in the night sky on Earth are featured this week. Plus, ...

The stars may not be aligning on Friday night, but seven planets in our solar system just may be. For weeks, outer space enthusiasts have been gearing up for a planetary alignment, or "planetary ...

Mars, often depicted as a barren red planet, is far from lifeless. With its thin atmosphere and dusty surface, it is an ...

If you missed May’s Northern Lights, another celestial event will occur next week called the “planetary parade,” where several planets will appear to be in a straight line from Earth, though only two ...

In late December, a telescope in Chile discovered a small asteroid given the designation 2024 YR4. About a month later, initial observations of the asteroid, estimated to be 40 to 90 meters across, ...

This article was updated Feb. 28, 2023. It was originally published March 1, 2000. Planetary gears can supply high levels of torque and high-speed reduction. They are also relatively compact compared ...