1. Why did scientists developed units of distance to measure the universe?
22. What are the four characteristics of planetary orbits?
31. Why aren’t comets always visible. What causes them to be visible?
34. What are the 3 zones of the Sun. Where does nuclear fusion occur?
35. What arethe 3 parts of the outer layer of the Sun?
39. What is the core of the ozone in our atmosphere. What chemical substance is responsible for diminishing our ozone layer?
2007-05-03 10:13:27 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
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Good luck.
2007-05-03 10:20:26 · answer #1 · answered by Anonymous · 0⤊ 2⤋
1. To assist with assessing distance and time
31. Comets are actually fairly dark chunks of icy rock; when they near the sun, the water & CO2 "outgas", and are blown away from the sun by solar wind, forming the comet's tail. The ice & gas are nearly white, and make the comet very visible.
34. core, the radiative zone, and the convection zone
Almost all the fusion occurs in the core.
35. 1 = photosphere, 2 = chromosphere, 3 = corona
39. Ozone is O3. Flurocarbons combine with O3, destroying it.
2007-05-03 17:34:22 · answer #2 · answered by quantumclaustrophobe 7 · 0⤊ 0⤋
1. Because measurement is done in terms of distance. If they didn't have units of distance, they couldn't measure.
22. Speed, Tilt, Oblonged, Size
31. Light. It is what makes anything visible.
34. Core
35. Chromosphere, Troposphere, Exosphere
39. Oxygen
2007-05-05 01:24:28 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Homework? Or a test? You didn't even remove the problem numbers from your many questions!
2007-05-03 17:20:19 · answer #4 · answered by campbelp2002 7 · 1⤊ 2⤋