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.
Using this compressed scale, where one inch is the Earth-Sun distance, you can get a better feel for the stupendous size of our galaxyâ¦. If the Sun was a grain of sand, and the Earth a microscopic speck one inch away, then Jupiter would lie 5.2 inches away and Pluto an average of 40 inches away. Next stopâ¦ the nearest star, about 4.3 miles away, with mostly empty space between it and the Sun.