A newly discovered comet is streaking past Earth, providing a stunning night-time show for star gazers. Comet Neowise swept within Mercury’s orbit a week ago and its close proximity to the sun caused dust and gas to burn off its surface and create an even greater debris. Now the comet is heading our way, with its closest approach expected in two weeks. Nasa's Neowise infrared space telescope discovered the comet in March, and scientists involved in the mission say it’s around three miles across. The comet will be visible around the world until mid-August, when it heads back towards the outer solar system. While it is visible with the naked eye in dark skies with little or no light pollution, binoculars are needed to see the long tail, according to Nasa.