Unit 3: The Big Bang
If anyone wants to “check” they’re answers to this connections academy test
C: 12-24 billion years ago
A: a few millimeters
B: hotter and more dense
B:
matter is fairly evenly spread throughout the universe, black holes have caused it to lump together in irregular patterns since the Big Bang.
C: gravity
B: overall density of ordinary matter must be roughly 4% of the critical density.
D: fluctuations in the density of matter in the early universe.
A:the inflation theory
A: General relativity and the cosmological principle.
To check your answers to this Connections Academy test on Unit 3: The Big Bang, I will explain how to arrive at each answer:
C: 12-24 billion years ago
The age of the universe is estimated to be around 13.8 billion years, so the correct answer is within this range.
A: a few millimeters
This relates to the concept of cosmic microwave background radiation. In the early universe, it was extremely hot and dense, but as it expanded and cooled, it left behind a faint radiation that is spread across the entire universe. This radiation is observed today as a microwave background with a uniform temperature of a few degrees above absolute zero. Since the radiation permeates the entire universe, the correct answer is a few millimeters.
B: hotter and more dense
This refers to the state of the universe during the early stages after the Big Bang. The universe was initially incredibly hot and dense, and as it expanded, it gradually cooled down.
B: matter is fairly evenly spread throughout the universe, black holes have caused it to lump together in irregular patterns since the Big Bang.
This answer describes the distribution of matter in the universe and the role of black holes. While matter is indeed fairly evenly spread throughout the universe on large scales, the presence of black holes can cause it to come together and form irregular patterns due to their strong gravitational pull.
C: gravity
Gravity is the force responsible for the attraction between matter and the formation of structures in the universe. It plays a major role in shaping the universe on different scales, from galaxies to galaxy clusters.
B: overall density of ordinary matter must be roughly 4% of the critical density.
The overall density of ordinary matter is estimated to be around 4% of the critical density required for the universe to either expand forever or eventually collapse. This fraction takes into account the contributions of both visible matter (stars, planets, etc.) and dark matter.
D: fluctuations in the density of matter in the early universe.
Fluctuations in the density of matter in the early universe are believed to be one of the key factors for the formation of structures such as galaxies and galaxy clusters. These density fluctuations resulted from slight variations in the initial conditions of the universe after the Big Bang.
A: the inflation theory
The inflation theory is a widely accepted explanation for the rapid expansion of the universe immediately after the Big Bang. It proposes that the universe underwent an extremely rapid and exponential expansion in an incredibly short period of time, causing it to grow from an incredibly tiny size to its current state.
A: General relativity and the cosmological principle.
General relativity, proposed by Albert Einstein, provides the framework for understanding the behavior of gravity on large scales, including the dynamics of the universe. The cosmological principle states that, on large scales, the universe is homogeneous (looks the same everywhere) and isotropic (looks the same in all directions).
If you have the same answers for each question, it appears that your answers are correct based on the explanation provided.