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.
We really don't know where all the planets in the galaxy are, but if the edge of the galaxy has stars with planets then the furthest are about 80 000 light years away. (The Soâ¦lar system is about 30 000 light years from the galactic center and the Milky Way is about 100 000 light years in diameter)