This week a comet that started life in the outer reaches of our solar system will be visible from Earth for the first time, as it approaches our planet’s orbit. The comet will be 66 million miles (106 million km) from Earth at its closest approach. Another recently-discovered object, called 2016 WF9, has also been taking a scenic tour of our solar system, approaching

Jupiter’s orbit at its greatest distance from the sun. On 25 February this year, it will approach Earth’s orbit, passing at a distance of nearly 32 million miles (51 million kilometers) from Earth. But Nasa still doesn’t know whether the object is an asteroid or a comet. READ MORE