Putting the Size of the Observable Universe in Perspective. The age of the universe is about 13.75 billion years. The diameter of the observable universe is estimated at about 28 billion parsecs (93 billion light-years). As a reminder, a light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles).
Red eye is the result of changes in the blood vessels in your eye that make your eye look red or bloodshot; it may occur in one or both eyes. Red eye is usually caused by irritation, infection or trauma. Even everyday causes, such as coughing, sneezing, crying, and lack of sleep, can lead to redness in your eye. Red eye is often accompanied by other eye symptoms, including burning, itching, soreness, tearing and discharge.
There are many factors that cause burst blood vessels in eye, and you may be surprised to hear some of them. Here we present you with a list of some common causes of broken blood vessels in eye: 1) Violent sneezing, coughing, or vomiting. Burst blood vessels in eyes are often caused by coughing or sneezing with force. The strain associated with severe vomiting could also be one of the causes of this problem. 2) Strenuous activity.