planets

Venus, Mars, Jupiter and Saturn are visible to the naked eye in January and for part of February. Uranus and Neptune can only be spotted with binoculars and telescopes.

The object known for now as 2014 UZ224 is only about 330 miles across and takes 1,100 years to orbit the sun. But one of the most interesting things about it is the way researchers found it.

It's not exactly close — 25 trillion miles from Earth, say the scientists who spotted it. But that might be near enough for further exploration. It's about Earth's size, with mild temperatures.