Frequently Asked Questions

There is a boundary approximately 100 km above the Earth's surface: the Kármán Line. From this point onwards, the atmosphere becomes so thin that aircraft wings become useless and space begins. However, this is not a sharp line but a gradual transition!What is space? →

That's right! Sound waves propagate through air, but there is no air in space to propagate through. Movies lie—explosions in real space are silent. Of course, this doesn't apply to planetary atmospheres; sound exists within them.Rules of Space →

The observable universe is approximately 93 billion light-years across. But there is space beyond that too—we just can't see it because the light can't reach us. In short: it's bigger than you can imagine.What is space? →

Space appears black because there's no air to scatter light. But it's not entirely empty — there's cosmic background radiation, starlight, and gas clouds. It's not literally black; astronomers call it a 'cosmic latte'!What is Space? →

Although it may sound like a unit of time, the light year is a unit of distance! It represents the distance light travels in one year—approximately 9.46 trillion km. So when we say '10 light years away', we mean '94.6 trillion km away'.What is a light year? →

Yes, but don't worry—this will happen in about 5 billion years. The Sun will first swell into a red giant, engulfing Mercury and Venus, and then shrink into a small white dwarf. The Earth will most likely become uninhabitable during this process.

According to Einstein's special theory of relativity, an object's mass increases as it accelerates. When it approaches the speed of light, this increase becomes so great that infinite energy would be required to accelerate further. In other words, due to the nature of the universe, there is a speed limit.What is the speed of light? →

Yes! Einstein's theory of relativity proved this. Both speed and gravitational force affect time. Astronauts on the ISS age slower, albeit by a very small percentage. Near black holes, the difference reaches dramatic levels.Rules of Space →

No, not exactly! The Big Bang was not an explosion outward from a single point; it was the expansion of space itself in all directions. At the beginning, there was no time, no space, and no matter—they all emerged together.Universe Theories →

Physicists are considering several scenarios: the 'Big Rip'—dark energy tears everything apart; the 'Big Freeze'—stars go out and the universe returns to cold darkness; or the 'Big Crunch'—gravity wins and the universe collapses back in on itself. We don't know yet which one it will be.Space Theories →