Is dark matter important in other galaxies and galactic clusters?
What will be an ideal response?
Dark matter is very common and is found in all galaxies. Dark matter is definitely present in galactic clusters and is important for holding the clusters together.
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The "Local Bubble" was probably created by a nearby supernova in the distant past
Indicate whether the statement is true or false
The best time for digging clams (when the low tide is extra low) is during the time of the
A) new or full moon. B) half moon. C) quarter moon. D) none of the above
A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?
A) On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. B) On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero. C) Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. D) The acceleration is downward at all points in the motion. E) The acceleration is downward at all points in the motion except that is zero at the highest point.
What happens when a particle and its corresponding particle of antimatter meet?
A) No one knows, since antimatter is only theoretical and not known to really exist. B) The particles join together to make an antimatter atom. C) The particles collide and then bounce back apart. D) The particle and the antiparticle are annihilated, turning all their mass into energy. E) They live happily ever after.