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.
This illustration demonstrates how small the Milky Way would look from the location of ULAS J0744+25, a red giant nearly 775,000 light-years away. This star, along with ULAS J0015+01, are the most distant stars ever observed that are associated with our galaxy.