In 2007, researchers at the University of CaliforniaâDavis determined that our Solar System was fully formed at 4.568 billion years ago. They did this by determining the age of stony materials from the asteroid belt.
When to see a doctor. See your doctor immediately if you experience the signs and symptoms of migraine with aura, such as temporary vision loss or floating spots or zigzag lines in your field of vision. Your doctor will need to rule out more-serious conditions, such as a stroke or retinal tear.
1 NMO most often causes visual changes in both eyes and symptoms caused by long lesions in the spinal cord.  Acute disseminated encephalomyelitis (ADEM) â A brief but intense attack of inflammation in the brain, spinal cord and occasionally the optic nerve that causes damage to myelin. Symptoms of ADEM come on quickly, often beginning with behavior changes.