However, it is the fainter Neptune moon, provisionally named S/2021 N1, that presents a unique challenge. With a size of approximately 14 kilometers and an orbit spanning almost 27 years ...

Neptune's pair of new moons brings the planet's total count up to 16. The larger of the two, provisionally known as S/2002 N5, was found to be 14 miles (23 km) in diameter with a nine-year orbit.

From January to March, the night sky will host a spectacular parade of planets featuring Venus, Mars, Jupiter, Saturn, Uranus ...