- When your TV or any sound-producing recorder or music system is not working properly, the useless noise it produces is actually the result of radiation formed immediately after the Big Bang, which still exists even after 15 billion years.
- According to astronomy, we say that all physical matter exists in this universe. It contains trillions of stars, solar systems, and galaxies. But this is only 25% of the total matter. There are still many other things yet to be discovered.
- If NASA sends a bird into space, it would not be able to fly and would soon die, because there is no force there to help it fly.
- Do you know that dark matter is a type of matter present in the universe that cannot be seen, but its gravitational effect is observed? That is why it is called dark matter — it exists but cannot be seen.
- If you count 100 stars per minute, you would count an entire galaxy in 2000 years.
- After the Big Bang, the universe expanded into its present form. But according to modern science, physical matter cannot travel faster than the speed of light. However, according to the Big Bang theory, the universe has expanded to 93 billion light-years in 15 billion years.
(1 light year = the distance light travels in one year.)
This confusion is explained by Einstein’s General Theory of Relativity. According to it, the farther two galaxies are from each other, the faster they move apart in proportion to their distance. This fact may seem difficult to understand, but if you read carefully, you can understand it gradually.
- The name of our galaxy is the Milky Way, and our solar system is part of it. In Greek, “galaxy” means “milk.” If you observe galaxies through a telescope, it looks like a stream of milk flowing.
- The Large Magellanic Cloud galaxy is the brightest of all galaxies. It is visible only in the Southern Hemisphere. It is 170,000 light-years away from Earth and has a diameter of 39,000 light-years.
- Abell 2029 is the largest galaxy in the universe. Its diameter is 5,600,000 light-years and it is 80 times larger than our galaxy. It is 1.07 billion light-years away from Earth.
- The Sagittarius Dwarf Galaxy was discovered in 1994 and is the closest galaxy to Earth. It is 70,000 light-years away.
- The Andromeda Galaxy is the farthest galaxy visible to the naked eye. It is 2,309,000 light-years away from Earth. It contains about 300 billion (30×10¹¹) stars and has a diameter of 180,000 light-years.
- Most galaxies are elliptical in shape, but some change their shape. Our galaxy, the Milky Way, is elliptical.
- Abell 1835 IR 1916 is the most distant galaxy in our universe. It is an astonishing 13.2 billion light-years away from Earth. In 2004, astronomers at the European Southern Observatory announced its discovery.
- The Cosmic Calendar
After the Big Bang, many astronomical and Earth events occurred, including the birth and extinction of dinosaurs. These events happened over such a vast time span that an ordinary person cannot easily understand it. To solve this problem, American mathematician and astronomer Carl Sagan proposed the “Cosmic Calendar.” In this calendar, the entire history of the universe from the Big Bang to now is represented as one year. Here are the events in this calendar:
January 1, 12:00 am — Big Bang; origin of the universe
March 15 — First stars and galaxies formed
May 1 — Formation of the Milky Way
September 8 — Formation of the Sun
September 9 — Formation of the Solar System
September 12 — Formation of Earth
September 13 — Formation of the Moon
September 20 — Formation of Earth’s atmosphere
October 1 — First single-celled life on Earth
October 7 — First known fossils
December 18 — First multicellular life
December 19 — First fish
December 21 — First land plants and insects
December 23 — First reptiles
December 24 — First dinosaurs
December 26 — First mammals
December 27 — First birds
December 28 — First flowering plants
December 29 — Extinction of dinosaurs
December 31, 11:55 pm — Entire recorded human history until now
Source: Google