_____ was the first person to produce a detailed heliocentric model of the Universe with substantial justifying arguments
A) Aristotle
B) Nicolaus Copernicus
C) Claudius Ptolemy
D) Galileo Galilei
B
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In 1912, after studying a star cloud called the Small Magellanic Cloud, Henrietta Leavitt concluded that:
A) stars are eternal and unchanging. B) the brightest stars have the shortest pulsation periods. C) the Sun and Earth are near the edge of our Galaxy. D) there was a relationship between pulsation periods and luminosities of stars.
In general, the surfaces of the planets will be ________ than the age of the solar system
Fill in the blank(s) with correct word
A teacher sends her students on a treasure hunt. She gives the following instructions:
1. Walk 300 m north 2. Walk 400 m northwest 3. Walk 700 m east-southeast and the treasure is buried there. As all the other students walk off following the instructions, Joe physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Joe need to walk? A) 187 m in a direction 67.3° north of east B) 481 m in a direction 40.9° north of east C) 399 m in a direction 52.5° north of east D) 284 m in a direction 28.2° west of north E) The treasure position cannot be reached in one straight walk.
About how many dots are seen in the Hubble Deep Field image, just within that image? What are the dots seen in the Hubble Deep Field?
A. 3000 galaxies. B. 3000 stars. C. 3 million galaxies. D. 100 galaxies. E. 3 million stars.