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Our Universe Video Lecture - Class 3
FAQs on Our Universe Video Lecture - Class 3
| 1. What is the universe? |  |
Ans. The universe refers to all of space, including the vast number of galaxies, stars, planets, and other celestial bodies, along with the various forms of matter and energy that exist within it.
| 2. How old is the universe? | |
Ans. The current scientific consensus suggests that the universe is approximately 13.8 billion years old. This age is estimated based on observations and measurements of cosmic microwave background radiation, the rate of expansion, and the age of the oldest known celestial objects.
| 3. What is the Big Bang theory? | |
Ans. The Big Bang theory is the prevailing scientific explanation for the origin and evolution of the universe. It states that the universe began as a hot and extremely dense point known as a singularity, which expanded rapidly and continues to expand to this day.
| 4. Is the universe infinite? | |
Ans. The question of whether the universe is infinite or finite is still a topic of scientific investigation. The current understanding is that the observable universe, the portion of the universe that we can detect and study, is finite but unbounded. However, the overall size and structure of the entire universe beyond the observable limit remain uncertain.
| 5. What is dark matter? | |
Ans. Dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation, making it invisible and difficult to detect directly. Its existence is inferred from its gravitational effects on visible matter and the overall structure of the universe. Dark matter is thought to account for a significant portion of the total mass in the universe.
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