THE recent radar measurements of Mercury indicate that the period of rotation of the planet is 59 ± 5 days 1. This result is in complete disagreement with the previously quoted value of 88 days ...

A 60-year-old tribute to America's first human spaceflight program is standing up to the test of time, but what about the ...

As the name suggests, retrograde refers to when a planet appears to go backward in its orbit as viewed from Earth.

Here are seven fascinating images of Mercury, shared by NASA, showcasing the unique features of the smallest and closest ...

The upcoming Mercury retrograde is the last one this year, and it'll bring some logistical drama and communication clashes ...

A planet thus formed continuing to revolve ... moon always turns the same face toward the earth, and that the rotation period of Mercury (and probably that of some of the satellites of Jupiter ...

Saturn has been weighed in the astronomer's balance, and found to contain twice as much matter as Mercury ... the planet rotated 2% times faster than it actually does. For the time of rotation ...

"The findings not only provide further evidence to support the theory of a Martian ocean but also present, for the first time ...

When Mercury, Venus, and Mars appear to move backward in their orbits, they enter a period called retrograde. Each planet's retrograde influences different aspects of life, prompting reflection ...

Why does the Earth spin? Sara H., age 5, New Paltz, New York A globe was the first thing I ever bought with my own money.

The planet of communication, Mercury, influences how you tell others what’s on your mind, your thought processes and your ...

For nearly 40 years, scientists have generally agreed that Earth's Moon formed from debris after a massive collision with our ...