How Far We Can See The Past?

Astronomy Science ~ The universe is a magical time window, allowing us to peek into the past. The further we look, the more far too time we...

Astronomy Science ~ The universe is a magical time window, allowing us to peek into the past. The further we look, the more far too time we see. Although the brain is telling us things that we see happening at the moment we see, the light moves only 300,000 kilometers per second, which makes a very strange time delay in the distance.

Let's say that you're talking with a friend who is 1 meter away. Light of your friend's face took about 3.336 nanoseconds to reach you. You always see your loved ones 3.336 nanoseconds to the past. When you look around you, you will see the world a fraction of a second ago.

The average distance Earth-Moon is 384,000 km. Light takes 1.28 seconds to reach the Earth from the Moon. If there was a huge explosion on the Moon, you will not see it for more than one second. Even trying to communicate with someone on the Moon would be frustrating because you will experience a delay every time you speak.

All the light that you see in the sky from the past
All the light that you see in the sky

Let us look at some examples of the larger. Sunlight takes 8 minutes and 20 seconds to reach the Earth. If you are currently viewing the Sun, it is sunlight that released more than 8 minutes ago. If the sun suddenly disappeared, you will not realize it until 8 minutes 20 seconds later.

The average distance of Mars about 14 minutes of light from Earth. When we were watching the live coverage of the NASA Curiosity Rover landed on Mars, it is not straight. Curiosity has landed a few minutes earlier, and we had to wait for a radio signal to reach us on Earth, because they move at the speed of light.

When the New Horizons spacecraft reaches Pluto, he will be within 4.6 hours of light from Earth. If we have a telescope powerful enough to see close encounter with Pluto, we will look at the events that occurred 4.6 hours ago.

The nearest star, Proxima Centauri, is more than 4.2 light years. This means that if there is an astronaut in Proxima Centauri, he will never know who the latest world cup champion. World Cup happens every four years, when they know the winners of the World Cup in 2014, the Earth has given 2018 World Cup winner. Since the signal takes reach them 4.2 years.

Core of our Milky Way galaxy is about 25,000 light-years away. When you see the beautiful pictures of the core of the Milky Way, you may see the light coming before humans first settled in North America.

Andromeda galaxy is 2.5 million light-years away, if we see this galaxy light, the light that left the Andromeda before the Earth has a Homo Erectus. If there are aliens in this galaxy and has a powerful telescope to look at the Earth's surface, they would start viewing dinosaurs roam the Earth's surface today.



Some of the brightest objects in the sky are quasars, which is formed of an active supermassive black hole consuming matter in the galaxy's core. Closest quasar is 2.5 billion light years away, much nothing further. Earth formed only 4.5 billion years ago, so when we see quasars shine, they have left the quasar light is even before the earth was formed. If you are in the quasar and have a powerful telescope to see the sun, you will not find Earth.

The Cosmic Microwave Background Radiation, the edge of the observable universe is 13.8 billion light-years away. The light leaving the universe when the universe was a few hundred thousand years, and only now reaching us. Odder still, the place which emit radiation that now is 46 billion light years from us.

So when you see the look deep into space, the farther anyway you look at the past.
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Astronomy Science: How Far We Can See The Past?
How Far We Can See The Past?
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