#observational-cosmology

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#universe-geometry #cosmic-microwave-background #big-bang-theory #spacetime-curvature #cosmic-expansion
Philosophy
fromBig Think
12 hours ago

Einstein showed space can curve, but data reveals a flat Universe

The Universe has a flat spatial geometry, confirmed through cosmic microwave background observations, rather than the curved or spherical shape many physicists theoretically preferred.
Science
fromBig Think
1 month ago

Ask Ethan: Can we see the expanding Universe changing?

Cosmic expansion stretches photon wavelengths and alters observability, producing extremely small real-time effects detectable only via precise, long-term redshift drift measurements.
Science
fromBig Think
5 months ago

Cosmic inflation's biggest criticisms can't undermine its success

Cosmic inflation explains early-Universe puzzles and matches observations to date, but faces conceptual challenges: the measure problem and claims of excessive flexibility.
Science
fromBig Think
6 months ago

Ask Ethan: Is dark energy no longer a cosmological constant?

Observational evidence hints dark energy may change over time, but current data remain inconclusive and many experts still favor a constant cosmological-constant interpretation.
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