which is evidence for the existence of dark energy (1 point)
One of the main pieces of evidence for the existence of dark energy is the observation that the expansion of the universe is accelerating. This was first discovered through observations of distant supernovae in the late 1990s, which showed that these supernovae were fainter and farther away than expected. This indicates that the expansion of the universe is not slowing down as previously thought, but actually speeding up. Dark energy is proposed as the explanation for this accelerated expansion, as it is hypothesized to be an unknown form of energy that permeates the universe and exerts a repulsive force, counteracting the gravitational pull of matter.
One piece of evidence for the existence of dark energy is the accelerated expansion of the universe. In the late 1990s, observations of distant supernovae revealed that the expansion of the universe was actually accelerating rather than slowing down as previously thought. This discovery was unexpected and led scientists to propose the existence of a mysterious force called dark energy. Dark energy is believed to counteract gravity, driving the accelerated expansion of the universe.
One piece of evidence for the existence of dark energy comes from observations of the expansion rate of the universe. The expansion of the universe can be measured by studying the distances between galaxies.
To find evidence for the existence of dark energy, scientists use various techniques, such as supernova surveys. Supernovae are extremely bright, dying stars that can serve as distant cosmic beacons. By measuring the brightness and redshift (the shift of light towards longer wavelengths) of these supernovae, scientists can determine their distances from Earth.
To get this evidence, scientists use telescopes to observe and measure the light from these supernovae. This requires collecting data on the brightness and spectrum of the supernova light. This information helps scientists determine the distance to the supernova and measure its redshift.
The observations of the brightness and redshift of supernovae have revealed something unexpected. The light from distant supernovae is fainter than predicted, suggesting that they are farther away than expected. This implies that the expansion rate of the universe is accelerating.
The existence of dark energy is a proposed explanation for this accelerated expansion. Dark energy is a hypothetical form of energy that fills the universe and is responsible for counteracting gravity, causing the acceleration.