Did Hubble 1990s supernovae show accelerating expansion?
Question asked:
“Observations by the Hubble Space Telescope of distant Type Ia supernovae in the late 1990s showed that the expansion of the universe is accelerating, leading to the discovery of dark energy.”
Summary
Observations made with the Hubble Space Telescope of distant Type Ia supernovae in the late 1990s revealed that these supernovae were dimmer than expected, indicating that the universe’s expansion is accelerating. This finding was a key piece of evidence that led to the identification of dark energy as the driver of the accelerated expansion.
Sources 60 searched
- Dark Energy - Imagine the Universe! - NASA
They expected that the expansion would be slowing, which would be indicated by the supernovae being brighter than their redshifts would indicate. Instead, they found the supernovae to be fainter than expected. Hence, the expansion of the Universe was accelerating!
- Marginal evidence for cosmic acceleration from Type Ia supernovae | Scientific Reports
That the SN Ia Hubble diagram appears consistent with an uniform rate of expansion has been noted earlier16,23,24,25. We have confirmed this by a statistically principled analysis, using the JLA catalogue of 740 SN Ia processed by the SALT2 method.
- Evidence from type Ia supernovae for an accelerating Universe - ScienceDirect
Over the past five years two teams have used type Ia supernovae to trace the expansion of the Universe to a look back time more than 70% of the age of the Universe. These observations show an accelerating Universe which is best explained by ...
- Supernovae, Dark Energy, and the Accelerating Universe
Hubble Space Telescope for follow-up light-curve observa- tions, because we could specify in advance the one-square- degree patch of sky in which our wide-field imager would · find its catch of supernovae.
- Hubble Dark Energy - NASA Science
It found that the supernovae were dimmer than they should have been, which meant that their host galaxies were farther away than expected. And that only made sense if the universe’s expansion was accelerating.
- Super Set of Supernovae Suggests Dark Energy Surprise – Berkeley Lab News Center
In 1998, they announced their surprising results: Instead of slowing down or staying constant, our universe was expanding faster and faster. The discovery of “dark energy,” the unknown ingredient driving the accelerated expansion, was awarded ...
- Farthest Supernova Yet Bolsters Dark Energy | Science
As Riess and colleagues announced on Monday at a press conference in Washington, D.C., supernova SN1997ff is so bright that it rules out both dust and evolution as explanations for the dimming, bolstering the case for dark energy.
- Supernovae, Dark Energy, and the Accelerating Universe
Supernovae, Dark Energy, and the Accelerating · Universe: The Status of the Cosmological Parameters
- Dark energy - Wikipedia
These difficulties became stronger ... models came under active study through the mid-1990s: these included the Lambda-CDM model and a mixed cold/hot dark matter model. The first direct evidence for dark energy came from supernova observations in 1998 of accelerated expansion in ...
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