Honorable children It is a chain of children of all ages. If you have a question you want to answer, send it to Uciouskidsus@theconversion.com.
What is behind outer space? Saya, 11 years old, Freemont, California
Above you are the sky – or as scientists call it, the atmosphere. Stretch 20 miles (32 km) above the ground. She floats around the atmosphere A mixture of molecules – Small parts of the air are very small, which you eat billions every time you breathe.
Above the atmosphere is space. This is called because it contains much lower molecules, with a lot of empty space between them.
Have you ever wondered what would have to travel to outer space – then continue? What will you find? Sayed scholars We are able to explain much of what you see. But there are some things that we do not know yet, such as if the space lasts forever.
Planets, stars and galaxies
At the beginning of your journey across space, you may get to know some tourist attractions. the Earth is part of a group of planets Everything that revolves around the sun – with some orbit asteroids and comets are also mixed.
You may know that the sun is actually just an average star, and it looks bigger and brighter than other stars Just because it is closer. To reach the closest star, you will have to travel via trillion miles from space. If you can ride at the fastest space probe that has ever succeeded in NASA, it will continue to take thousands of years to get there.
If stars are like homes, galaxies are similar to homes full of cities. Scientists estimate that there 100 billion stars in the Earth’s galaxy. If you manage to reduce, beyond the Galaxy Earth, then these 100 billion stars are mixed together – the way the city’s buildings lamps operate when displayed from a plane.
Astrologists have recently learned this Many stars or even most stars have their own tropics. Some are like Earth, so they can also be home to other organisms who also ask about what is exist.
You will have to travel through Millions of other trillion of space just to reach another galaxy. Most of this space is almost completely empty, with some small stray and mysterious molecules Illuminated molecules call on scientists “the dark matter“
Using large telescopes, Astronomers see millions of galaxies There – they continue in every direction.
If you can watch for a long time enough, over millions of years, it will look new The space is gradually added among all galaxies. You can imagine this by imagining small points on a stomach balloon and then thinking about its bombing. The points will continue to move further, just like galaxies.
Is there an end?
If you can go out, as much as you want, will you continue to pass the galaxies forever? Is there an endless number of galaxies in every direction? Or is the whole matter ending in the end? And if the matter is over, what does it end up?
These are the questions that scientists do not have specific answers yet. Many believe that you are just likely Continue the passage of galaxies in every direction, forever. In this case, the universe will be unlimited, without end.
Some scientists believe it is possible The universe may eventually surround itself – So if you can continue to go out, you will one day return to the place where you started, from the other direction.
One way to think about this is to photograph the globe, and imagine that you are a creature that can only move on the surface. If you start walking in any direction, east for example, and continues to continue, in the end you will return to the place where you started. If this is the case for the universe, this means that it is not large without limits – although it will remain greater than you can imagine.
Either way, you can never reach the end of the universe or space. Scientists now consider that it is unlikely that the universe has an end – an area where galaxies stop or where there will be a type of type that represents the end of space.
But no one definitely knows. You will need to know how to answer this question by a future world.
Hello, curious children! Do you have a question you want an expert? I ask a very person to send your question to Uciouskidsus@theconversion.com. Please tell us your name, age, and city in which you live.
Since curiosity does not have the maximum age – adults, he told us what you also wonder. We will not be able to answer every question, but we will do our best.
This article is updated to correct the distances to the nearest star and Galaxy.
This article has been republished from ConversationAn independent, non -profit news organization brings you facts and trusted analysis to help you understand our complex world. Written by: Jacques Sinjaland Richmond University
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Jack Singal does not work for, consulting or owning shares in or receiving funding from any company or institution that will benefit from this article, and has not revealed any related affiliations that exceed its academic appointment.
