In the 1990s, scientists investigated MACHOs (Massive Compact Halo Objects), like dim stars or black holes, as dark matter candidates. However, extensive searches failed to find enough of them, reinforcing the particle-based WIMP theory. A major shift occ

In the 1990s, scientists investigated MACHOs (Massive Compact Halo Objects), like dim stars or black holes, as dark matter candidates. However, extensive searches failed to find enough of them, reinforcing the particle-based WIMP theory. A major shift occurred in 1998 with the discovery that the universe's expansion is accelerating, a phenomenon attributed to Dark Energy. Current models suggest the universe is 68.5% Dark Energy, 26.6% Dark Matter, and only 4.9% baryonic matter. Dark energy behaves like Einstein's cosmological constant (lambda), an idea he once considered his "worst mistake" but which now seems necessary. Schilling uses an empty water bottle analogy to illustrate that the vast majority of the universe's composition—both dark matter and dark energy—remains a complete mystery despite our ability to measure its effects. (6/8)
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