By 3:30 am in Iceland, on a quiet night last September, much of that night's auroras had died down. Suddenly though, a new burst of particles streamed down from space, lighting up the Earth's atmosphere once again.
If seen in the right light, Saturn glows like a neon sign.
In a flash, the visible spectrum of the Sun changed from absorption to emission on March 9 during the total solar eclipse
Al-Hasa (Credit: Google Earth)
As the robotic New Horizons spacecraft moves into the outer Solar System, it is now sending back some of the highest resolution images from its historic encounter with Pluto in July. Featured here is one recently-received, high-resolution image. On the left is al-Idrisi Montes, mountainous highlands thought composed primarily of blocks of solid nitrogen.
Saturn's icy moon Enceladus poses above the gas giant's icy rings in this Cassini spacecraft image.
The above image was taken in 2008 April near the North Pole of Mars.