Image Credit: NASA. Asked by Jon Gray. An impact basin known as Valhalla is Callistoâs largest crater with a diameter of over 300 kilometres (190 miles), while concentric rings that surround it extend out to 3,000 kilometres (1,900 miles) â nearly large enough for the entire USA to fit within its boundaries.
Somewhat surprisingly, the second most common cause of tinnitus is head and neck injuries. In a clinical study of 2,400 tinnitus patients at the Oregon Health Science University, more than 12% reported that their tinnitus had been caused by head or neck injury. (1) There are two broad categories of head and neck injury, Traumatic Brain Injury (TBI) and whiplash.
If a foreign body or earwax causes tinnitus, removing the object or wax often makes the tinnitus go away. Tinnitus that sounds like a heartbeat may be more serious. It could be due to an abnormal growth in the region of the ear, such as a tumor or an abnormal connection between a vein and artery.