Dark matter and dark energy, making up most of the universe, are elusive forces that shape cosmic structure and expansion. Scientists worldwide, including at Argonne National Laboratory, are using advanced technology to unravel these mysteries. Credit: SciTechDaily.comThere’s something amiss in the cosmos. Mysterious influences seem to be stretching the universe apart and clumping stuff together in unexpected ways, but we can’t see or touch them.
Gravity plays a crucial role in how galaxies form and move around. As scientists learn more about the universe, they find that much of the behavior of galaxies wouldn’t make sense unless there were a huge amount of invisible matter present — way more matter than we have yet to uncover. This invisible — or dark — matter exerts an extra gravitational pull. If it did not exist, some galaxies would fly apart, and some wouldn’t have formed at all.
Meanwhile, something else is driving the universe to expand faster and faster. The universe, as far as we can tell, has been expanding since it began 13.8 billion years ago. The space between objects is ever-increasing, as if space itself is being stretched apart like the surface of a balloon as it’s inflated. Scientists expected that the speed of this expansion would slow down with time, but instead, they’ve discovered the opposite.
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