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 nearest star, Proxima Centauri, is 4.3 light-years away. 4.3 light year. Taylor, Stuart Ross. Solar System Evolution. USA: Lunar and Planetary Institute, 1992: 41. The nearest star is about 4.3 light years. 4.3 light year. The Sun is about 93 million miles from the earth.The star nearest to the Sun is Proxima Centauri. Astronomers measure the distance between stars in units called light-years. A light-year equals 5.88 million million miles (9.46 million million kilometers).he nearest star is about 4.3 light years. 4.3 light year. The Sun is about 93 million miles from the earth. The star nearest to the Sun is Proxima Centauri. Astronomers measure the distance between stars in units called light-years.