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.
The elliptical paths mean that the planets do not remain at a constant distance from the sun. At its closest, or perihelion, Jupiter lies 460 million miles (741 million km) from the star; at its farthest, or aphelion, it is 508 million miles (817 million km) away. On average, the distance to Jupiter is 484 million miles (778 million km).