https://youtu.be/Ng0JHWN6XPc
The Solar System's Biggest Mysteries: What Are Dark Matter and Dark Energy?"
Intro
https://youtu.be/Ng0JHWN6XPc
Milky Way galaxy with the Solar System in the foreground, with dark matter and dark energy highlightedOpens in a new window
Milky Way galaxy with the Solar System in the foreground, with dark matter and dark energy highlighted
Hi everyone, and welcome to this video about the solar system's biggest mysteries: dark matter and dark energy.
What is dark matter?
galaxy with its visible matter highlighted, and dark matter surrounding itOpens in a new window
science.nasa.gov
galaxy with its visible matter highlighted, and dark matter surrounding it
Dark matter is a mysterious substance that makes up about 85% of the matter in the universe. It is invisible and cannot be detected directly, but we know it exists because of its gravitational effects on visible matter.
What is dark energy?
Dark energy is an even more mysterious force that is causing the universe to expand at an accelerating rate. It makes up about 70% of the universe, and we know very little about it.
How do we know dark matter and dark energy exist?
galaxy cluster with its visible matter highlighted, and dark matter surrounding itOpens in a new window
science.nasa.gov
galaxy cluster with its visible matter highlighted, and dark matter surrounding it
We know that dark matter exists because of its gravitational effects on visible matter. For example, galaxies spin too fast to be held together by their visible matter alone. This suggests that there must be a large amount of invisible matter, such as dark matter, that is providing the extra gravity.
We know that dark energy exists because of the accelerating expansion of the universe. If the universe were filled with normal matter and energy alone, it would be expanding at a decelerating rate. However, observations show that the universe is actually expanding at an accelerating rate. This suggests that there must be a new force, such as dark energy, that is causing the universe to expand faster and faster.
What are the implications of dark matter and dark energy?
The existence of dark matter and dark energy has a number of implications for our understanding of the universe. For example, it suggests that the universe is much more massive than we previously thought. It also suggests that the universe is likely to continue expanding forever.
Dark matter and dark energy are two of the biggest mysteries in the universe. Scientists are still working to learn more about these mysterious forces, but they are thought to play a major role in the evolution of the universe.
If you want to learn more about dark matter and dark energy, be sure to check out some of the other videos on my channel!
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