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 ...

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

Finally, there is little Mercury, the smallest and closest planet to the sun. It's an evening object, but its lowness to the southwest horizon will make it a difficult object to view through much ...

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 ...

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 ...

You likely already know that Mercury retrogrades — which occur when the messenger planet appears to move backward from our vantage point on Earth — happen three or four times a year and last ...

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.

Space exploration often reveals unexpected surprises. In June 2023, during its flyby of Mercury, the BepiColombo mission collected information about the planet's magnetic field. These observations ...

Scientists have developed a new method to compute how tides affect the interiors of planets and moons. Importantly, the new ...

One of the highlights to be found in this month’s Colorado sky is the golden-hued planet Saturn which can be seen forming an ...

The planets Mercury and Venus appear in our western sky this week at dusk. If you think back to elementary school, you’ll recall learning that Mercury is ...