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.
Yes, all the visible stars are in the Milky Way. It takes a huge telescope and long time exposures to resolve stars in other galaxies. In fact, the farthest star we can see with the naked eye under the best of conditions is probably epsilon Aurigae-A, which is almost 8000 light years away.