Archive · 19 Aug 2025
Dark Energy: The Mystery Shaping the Universe's Future
Imagine the universe as a balloon with dots (galaxies) on it.
When you blow up the balloon, the dots move apart.
Scientists discovered the universe is expanding, like the balloon inflating.
They found it's not just expanding, but speeding up!
This acceleration is caused by something called dark energy, a mysterious force.
Scientists are trying to figure out what dark energy is using telescopes and experiments.
Understanding dark energy will help us learn how the universe began and what will happen to it in the future.
It's like solving a cosmic puzzle!
The universe is expanding, a discovery that led to the Big Bang theory.
In the 1990s, scientists used Type Ia supernovae to measure the universe's expansion.
Contrary to expectations, the expansion of the universe is accelerating.
Dark energy, which accounts for 68% of the universe's energy, is the driving force behind this acceleration.
Ongoing projects like DESI and Euclid aim to understand the nature of dark energy.
- Who
- Scientists, including Saul Perlmutter, Brian Schmidt, Adam Riess, and others, are studying dark energy.
- What
- The accelerating expansion of the universe and the role of dark energy.
- When
- Expansion was discovered in 1929, and acceleration was discovered in the 1990s.
- Where
- The expansion of the universe is happening everywhere.
- Why
- To understand the universe's origin, evolution, and ultimate fate.
Unclear nature of dark energy
Current understanding
What is Dark Energy?
Unclear nature of dark energy
Dark energy could be an intrinsic property of space or something more exotic.
Current understanding
Scientists continue to study the nature of dark energy through the projects listed above.
- Discovery of Expansion
- 1929, by Edwin Hubble
- Accelerating Expansion
- Discovered in the 1990s
- Dark Energy's Contribution
- Approximately 68% of the universe's energy
- Ordinary Matter
- About 5% of the universe
- Dark Matter
- Approximately 27% of the universe's energy
- Key Projects
- DESI, Euclid, Dark Energy Survey