Astronomers - Study guides, Class notes & Summaries

A few decades ago, there was great controversy among astronomers over the question of quasar distances, with some arguing that quasars are much nearer than application of Hubble's law would seem to imply. Why do nearly all astronomers now agree that quasars really are quite far away? - ️️We now have images and spectra that clearly show quasars to be embedded at the centers of distant galaxies and within distant galaxy clusters. A quasar's spectrum is hugely redshifted. What do most astron...

Gravity is an ________ force between two objects with mass, acting along the line between them. - correct answer attractive How many stars are in the Milky Way galaxy? - correct answer 200 billion Newton's first law of motion says that an object at constant velocity will remain at constant velocity unless acted upon by a - correct answer force In his General Theory of Relativity, Einstein revised our understanding of - correct answer gravity Early astronomers believed the earth was ...

PHSC 102 Exam Questions with Correct Answers How long does the sunspot cycle last, on average? Select one: a. about seven years b. about 76 years c. about 11 years d. between 25 and 35 days - Answer-11 years The vibrations of the Sun reveal information about Select one: a. the magnetic field of the Sun. b. the production of energy in the Sun. c. the structure of the atmosphere of the Sun. d. the interior structure of the Sun. - Answer-interior structure The most abund...

Astronomy Final Exam Study Guide Questions And Answers 100% Solved The way scientists know that a hypothesis is a reasonable description of nature is to... ️️Do experiments and observations about predictions of the hypothesis A lightyear is.... ️️The distance that light travels in one year A star is 230 light years away. the light we see tonight from that star left it.... ️️230 years ago The Star that provides energy for the Earth is..... ️️The Sun The location of the ...

ABCTE -The Solar System and the UniverseTools of the Astronomer - correct answer The basic tool that astronomers use to study celestial objects is the telescope. People tend to be most familiar with optical telescopes, but astronomers use telescopes that span the entire electromagnetic spectrum. Radio Waves - correct answer Radio waves are the longest waves of the electromagnetic spectrum. We use radio waves to broadcast radio, TV, and cellular phone signals. Radio waves are also used to pe...

Introduction This assignment is an introduction to familiarize myself with some aspects of observational astronomy. It consists of 4 different exercises, the first 3 dealing with observations of the night sky, and the last one dealing with observations of light sources through a diffraction grating. It has been designed with the intent to gain familiarity with the night sky, to gain experience in making basic astronomical observations, and to appreciate how astronomers make use of these obser...

tidal hypothesis : Theory that the solar system started with a near collision of sun and large star. Few astronomers believe this theory. condensation hypothesis : solar system began with rotating clouds of dust and gas. Condensation happened in center to form sun, and smaller parts of clouds formed. More astronomers believe in this idea. Core : Outer core- liquid; inner core- solid. Very dense in center. Believed that core is 80% iron. Helps heat oceans. Mantle : Surrounds core. ...

Astro 102 Final Sets Questions With 100% Correct Answers | Latest Update What is the main reason that astronomers have devoted many years of effort to determining the rotation curve for the Milky Way galaxy - ANSWER : The rotation curve can be used to help us determine the distribution of the mass in the galaxy How does the diameter of the disk of the Milky Way compare to its thickness? - ANSWER : The diameter is about 100 times greater than its thickness The most common form...

Why does the Moon show phases in the course of a month? a. the Moon glows from the inside, and its various continents glow different amounts b. the angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight c. more or less light from the Earth is reflected as the Moon turns around it d. clouds get in the way of the Moon's light and cover up parts of it e. the Earth's shadow falls on the Moon to different degrees as the Moon goes around correct answers b. ...

GACE science/math 088 questions and answers already passed A group of students measured the boiling point of three different samples of pure water. Each measurement was made by a different student using the same thermometer. Their measurements were 94oC, 99oC, and 104oC. Which of the following most likely accounts for the discrepancy in the measurements? The students misread the markings on the thermometer. Option (B) is correct. The error that most likely accounts for the discrepanc...