 The image shows a night sky with a green aurora borealis, also known as the northern lights. The aurora borealis is a natural light display that occurs in the Earth's sky, primarily in the high-latitude regions. The aurora is caused by the interaction of the solar wind with the Earth's magnetic field. The solar wind is a stream of charged particles that is constantly emitted from the Sun. When the solar wind interacts with the Earth's magnetic field, it is deflected towards the poles. As the solar wind particles approach the poles, they collide with atoms and molecules in the atmosphere, causing them to emit light. The color of the aurora depends on the type of atom or molecule that is excited. In this image, the aurora is green, which means that the atoms and molecules that are being excited are nitrogen.