Answer:
Rome
Explanation:
Rome was one of the first strongest empires at the time, All they did was expand and expand also becoming the largest empire. The Empire demolished its opponents. But problems started to come whne people that were getting taken over wanted a say in governement become the roman republic. Allowing citizens to vote for who they wanted to happen until Julius Ceaser marched into Rome and took over the government becoming a dictator. Religion was changing as well with the coming of Jesus. This became a fight between the Roman Catholic Church and The Religio Romana(The Roman Religion) caused more tension between people. Finally invasions. Barbarians from the east started moving west into the roman empire. The Roman empire was so big. troops could not get reinforcements fast enough causing cities to get invaded before the roman empire fell becomeing the Byzantine Empire.
Answer:
b. flat rotation curves in spiral galaxies
Explanation:
Dark matter accounts for majority of the matter in the universe (about 85%). It is considered to be composed of subatomic particles which are yet to be discovered. Dark matter cannot be observed because it does not emit light that can be detected. Only its gravitational effect is visible.
Astronomers when calculated the mass of the visible matter and tried to account for the observed speed of stars in the galaxy, there was a mismatch. To understand what caused this mismatch, astronomers gave name to the invisible matter as the Dark Matter.
The expected velocity of stars should decrease away from the near the center of the galaxy but a constant velocity of stars was observed that is a relatively flat rotation curve was obtained.
Thus, flat rotation curves in spiral galaxies in an evidence of Dark Matter.
When they are all close, they are called clusters
Answer:
an irregular galaxy is a galaxy that does not have a distinct or regular shape.
Explanation:
Small fragments of orbiting bodies that have fallen on earths surface are known as "meteorites" and originate from larger bodies such as asteroids or comets in space. <span />
