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An invisible form of matter that scientists believe provides extra gravity to hold galaxies together.
Dark matter does not emit, absorb, or reflect light, making it extremely difficult to detect directly. Its presence is inferred only through its gravitational effects on visible stars and gas. Scientists continue to search for direct proof of what particles make up this mysterious substance.
A radical cosmological model suggests the universe is nearly twice as old as commonly thought and operates without dark matter or dark energy.
Using early data, astronomers found two faint companions orbiting the Milky Way, hinting at hundreds more waiting to be discovered.
Mathematicians at UC Davis argue that cosmic acceleration may stem naturally from Einstein's equations, challenging the need for dark energy.
