Which of the following could not be measured by an observation that uses only imaging?
A) the rate at which a variable star brightens and dims
B) the general shape of an interstellar cloud of gas
C) the color of a planet
D) the brightness of a star in our sky
E) the number of bright stars in a nearby star cluster
A
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The sentence “Brass is an element in the periodic table” is a logical statement.
Indicate whether the statement is true or false
Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the Porsche has completed 9 laps
If the speed of the Ferrari had been 10 km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the speeds of the two cars?
If you are whirling a ball on a string and you suddenly cut the string, what happens?
a. The ball falls immediately to the ground. b. The ball keeps traveling in the same circle. c. The ball goes off in some random straight line. d. The ball goes off in a straight line based on where it was heading when the string was cut. e. The ball goes off in a straight line path directed radially outward from the center of the circle.
Briefly describe how astronomers estimate the number of galaxies in the observable universe.
Fill in the blank(s) with the appropriate word(s).