Interesting facts about the universe you may not know

1. In space, you can't scream.

Sound needs a medium to travel through, and since space is a near-absolute vacuum, sound cannot travel through it. This means that no matter how loud you shout in space, no one will be able to hear you.

2. A day on Venus is longer than a year on it.

Venus rotates on its axis extremely slowly, taking 243 Earth days to complete one rotation. Meanwhile, it takes only 225 days to orbit the Sun. That means a day on Venus is longer than a year!

Illustration photo.

3. The smell of space is the smell of burning metal.

Astronauts have reported that their spacesuits smell like welding, gunpowder, or burning metal after returning from space. Although you can’t smell it directly in the vacuum of space, the ionized molecules that remain on the surface create the strange, characteristic smell.

4. It may rain diamonds on Neptune and Uranus

At the great depths of these two planets, the enormous pressure causes methane molecules to be compressed, forming carbon crystals – diamonds – which fall like raindrops. This is no longer a hypothesis but is gradually being proven by simulation experiments in the laboratory.

5. There is no “up” or “down” in the universe

On Earth, we are accustomed to knowing direction through gravity. But in space, where there is no directional gravitational force, the concepts of “up” and “down” are relative. This makes navigating in space challenging and entirely dependent on sensors and navigational devices.

6. The Universe is Expanding – and Faster

Since the Big Bang, the universe has been expanding. But what has puzzled scientists is that the rate of expansion has not slowed down over time as predicted, but has been increasing. The cause is believed to be "dark energy" - something that humans still do not fully understand.

7. There are billions of Earth-like planets in the Milky Way.

With modern telescopes like Kepler and James Webb, scientists have discovered tens of billions of planets in the “habitable zone” around stars – where conditions may be suitable for life. This makes the possibility of life beyond Earth more credible than ever.

The universe is more than just a place of stars, planets, and black holes. It is a vast, paradoxical, and mysterious world waiting to be discovered by humans. And although we have only touched the tip of the iceberg, the facts above are enough to make anyone marvel when looking up at the night sky.

Bao Ngoc (t/h)

Source: https://doanhnghiepvn.vn/cong-nghe/nhung-su-that-thu-vi-ve-vu-tru-co-the-ban-chua-biet/20250417101500636