🌌The true immensity of the universe is beyond human comprehension.
🌟Astronomers use parallax and standard candles to measure distances to stars and galaxies.
🔭The visible universe contains around 100 billion galaxies, each with about 100 billion stars.
⏳The light from some of the most distant galaxies has taken around 13 billion years to reach us.
🏛️To grasp the scale, imagine shrinking the Milky Way down to the size of a grain of sand.
How do astronomers measure distances to stars and galaxies?
—Astronomers use techniques like parallax and standard candles to measure distances. Parallax involves measuring the apparent movement of a star when observed from different positions on Earth's orbit. Standard candles are stars with known brightness, allowing astronomers to calculate their distance based on how bright they appear to us.
How many galaxies and stars are in the visible universe?
—The visible universe contains around 100 billion galaxies, and each galaxy contains about 100 billion stars. This means there are approximately 10,000 million million million stars in the visible universe.
How far has the light from the most distant galaxies traveled?
—The light from some of the most distant galaxies has taken around 13 billion years to reach us. This is because light travels at a speed of 300,000 kilometers per second.
How big is the Milky Way compared to the visible universe?
—To grasp the scale, imagine shrinking the Milky Way down to the size of a grain of sand. In that case, the visible universe would be the size of a cathedral.
Is it possible for humans to comprehend the true immensity of the universe?
—The true immensity of the universe is so vast that it may be difficult for our brains to comprehend. We are limited by our perception and the scale of our everyday experiences. However, astronomers continue to use various techniques and advancements in technology to study and explore the universe.
00:24The true immensity of the universe is beyond human comprehension. It's difficult for our brains to grasp the magnitude and size of the universe.
00:47Astronomers use techniques like parallax and standard candles to measure distances to stars and galaxies.
03:15The visible universe contains around 100 billion galaxies, and each galaxy contains about 100 billion stars.
03:58The light from some of the most distant galaxies has taken around 13 billion years to reach us, traveling at a speed of 300,000 kilometers per second.
05:39To grasp the scale, imagine shrinking the Milky Way down to the size of a grain of sand. The visible universe would be the size of a cathedral.
