2018-02-26 06:26:02 UTC
Des mesures très précises de la valeur de la constante de Hubble sont
hors de clous...
"This means that the acceleration itself might not have a constant value
in the universe but changes over time in the universe. Riess shared a
Nobel Prize for the 1998 discovery of the accelerating universe.
Another idea is that the universe contains a new subatomic particle that
travels close to the speed of light. Such speedy particles are
collectively called "dark radiation" and include previously known
particles like neutrinos, which are created in nuclear reactions and
radioactive decays. Unlike a normal neutrino, which interacts by a
subatomic force, this new particle would be affected only by gravity and
is dubbed a "sterile neutrino."
Yet another attractive possibility is that dark matter (an invisible
form of matter not made up of protons, neutrons, and electrons)
interacts more strongly with normal matter or radiation than previously