What direct evidence do we have that the weak and electromagnetic forces were once unified as a single force?
A) Particle accelerators on Earth can reach energies equivalent to the high temperatures of the Electroweak era and have produced particles predicted by the unified theory.
B) Detectors on Earth have received photons and high-energy particles from the GUT era.
C) The most advanced telescopes are able to see back to the GUT era in the universe.
D) Temperatures in the center of the Sun can reproduce the conditions during the Electroweak era.
E) We have no direct evidence of such a unified force.
Question 2
The Observable Universe: How does the age of the universe (estimated at 14 billion years) introduce the concept of the observable universe? Suppose you feel, as do many astronomers, that the universe is much larger than the observable universe
Do you think there is any way to obtain direct evidence for this larger universe?
Evidence-based practice: skin assessment
Gravitational Forces
Evidence for a Coincidence Detector in the Brain of a Barn Owl
Classes of Forces
Direct thumb pressure to a trigger point.
The Visible Spectrum of Electromagnetic Energy