Patrick designed an experiment with modeling clay. The steps of the experiment are listed below. Flatten a piece of modeling clay on the palm of your hand.
• Make four dots on the modeling clay with a marker.
• Stretch the modeling clay equally from all directions.
• Observe how the position of dots changes when the modeling clay is stretched.
Which of these can be best verified with the help of Patrick's experiment? (2 points)
of 2
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Select one:
a. the size of the galaxies increases when the universe expands
b. the stars move towards Earth when the universe expands
c. the density of particles in space changes when the universe expands
d. the gravitational force of the universe increases when it expands
The first coordinate of the celestial coordinate system is called (2 points)