1 The head is one of the most common sites of pain in the body. 2  The most common types of headache can be classified as 1) primary, 2) secondary, and 3) cranial neuralgias, facial pain, and other headaches. 3  The most common types of primary headaches are 1) tension, 2) migraine, and 3) cluster.
Gassy signature of habitability spied in the atmosphere of a 'hot Jupiter'. Katharine Sanderson. Carbon dioxide, one of the telltale signs that a planet may be able to support life, has been spotted in the atmosphere of a gas giant orbiting a star 63 light years from Earth.
The Galileo mission discovered something amazing! Europa has its own atmosphere, although it is very, very thin. This atmosphere is created when fast moving molecules in Jupiter's magnetosphere hit the surface of Europa and knock out a water molecule. These molecules may float around Europa for awhile, but because of Europa's weak gravity, the atmosphere rapidly drifts away. Because Europa has an atmosphere with molecules that can escape, there is a donut-shaped belt of material inside Jupiter's magnetosphere that is called the Europa torus. Jupiter's moon Io also has a torus.