Practice Reading & Listening on Dark Universe
Practice Reading & Listening on Dark Universe for IELTS & TOEFL with illustrated flashcards inside the passage, a podcast from National Geographic YouTube Channel and text-to-speech functionality
The planets, moons and stars make up less than 5% of all the mass in the universe. The rest lies in the realm of absolute darkness. The dark universe is the invisible, yet dominating component of the cosmos. It includes a substance called dark matter and a force called dark energy. While little is known about either, each helps us understand the universe beyond what the eye can see.
What is dark matter?
Dark matter makes up about 25% of mass in the universe, but its composition is still unknown. The substance neither emits nor reflects light, and because of that, it cannot be seen. The existence of dark matter can be inferred based on its gravitational pull on the visible universe. According to some scientists, this force prevents stars within galaxies from drifting away.
Dark matter may have also played a role in the creation of the cosmos. After the Big Bang, dark matter formed a network of filaments across the universe, and in this network, the first stars and galaxies were born.
Dark energy
Not much is known about dark matter, but even less is know about dark energy. Dark energy is a mysterious force that fills the space between objects. It makes up about 70% of mass in the universe, plus it has a repulsive property that counteracts the force of gravity.
The existence of dark energy
The reason for dark energy’s existence is unclear. one theory states that it’s the fifth force of nature, yet another says it may help explain why the universe is expanding. In his theory of General Relativity, Albert Einstein considered a repulsive force, similar to dark energy, that pushed space and particles apart. Called the cosmological constant, the variable may provide clues for the expansion of space and time.
Much about the dark universe is left to be discovered, but with every theory and technological development, secrets of the invisible cosmos will come closer to being revealed.
It seems so perplexing how the universe created or came to existence. Contemplating about all these sometimes seems to be beyond the reach of human understandings.
Feedback
* how the universe was created
Dark universe is actually reminds me of scaring from darkness and it is actually very annoying how much we learned we still know nothing about this world .
It seems that there is no end to learning, and our current level of knowledge about the world around us is literally so primitive. So, there’s a long journey ahead of us to make discoveries again and again, one after each other.
Dark universe is actually reminds me of scaring from darkness and it is actually very annoying how much we learned we still know nothing.
Yeah, it’s like targeting a mountain or hill to climb up, and as soon as you reach for the summit of the mountain, you see you’re surrounded by countless hills and mountains in front of you waiting to be climbed up.
It’s kind of funny that how much technology and science has improved in these late decades but still we know nothing. But we have to start from somewhere eventually.
That’s right. Learning is actually endless, and the more we learn, the more we realize there is more to learn. Yet, uncovering the mysteries of the universe is quite a thrill.