Oral route. Many drugs can be administered orally as liquids, capsules, tablets, or chewable tablets. Because the oral route is the most convenient and usually the safest and least expensive, it is the one most often used. However, it has limitations because of the way a drug typically moves through the digestive tract.
Measuring Distances to Stars. Astronomers use several techniques for discovering how far away an object is. The first is called trigonometric parallax and is based on geometry, but it is only good for up to about 500 light-years.
Every star is a different distance from earth. The nearest star is the sun, about 93,000,000 miles away. (rounded) The next nearest star is Proxima Centauri, about 25,866,000,000,000 miles away. (rounded) Astronomers have photographed the light of stars as far from earth as. 80,538,000,000,000,000,000,000 miles.