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.
Report Abuse. That depends. Distance from the earth to stars is measured in light years. It takes a ray of light (light travels at 186,200 miles per second) one year to reach the earth. So a star that is 10 million light years away...it takes 10 million years to reach earth.That is why you'll hear astronomers say that when we are looking at stars, we are looking back into the past.eport Abuse. That depends on how far away the star is. The closest star is Alpha Centauri, which is about 4.37 light years away. So it takes 4 years and 3 months for light to reach us from Alpha Centauri.