Tag

Cosmic Distance Ladder

All articles tagged with #cosmic distance ladder

science3 hours ago•4 min saved

Neutron-Star Merger Brings Fresh Data to the Universe's Expansion Rate

An international team combined gravitational-wave data from a neutron-star collision with telescope and astrometric observations to measure the Hubble-Lemaitre Constant via the Cosmic Distance Ladder. Their result adds a late-Universe, gravitational-wave–based data point that loosely aligns with early-Universe (CMB) estimates, highlighting GW methods as a valuable but still less precise tool to help resolve the Hubble tension. More neutron-star mergers are needed to confirm the implications for cosmology.

via Universe Today|

#cosmic-distance-ladder #gravitational-waves #hubble-constant

astronomy2 years ago•4 min saved

"Universe's Puzzling Behavior Confirmed by Webb and Hubble Telescopes"

The Hubble Tension, arising from conflicting distance measurements, has been a long-standing challenge in astronomy. The James Webb Space Telescope's latest data confirms that the Hubble Space Telescope's measurements of the expanding Universe were accurate, eliminating doubts about measurement errors. This suggests the existence of an unseen force driving cosmic expansion, leading to the need for further investigation by next-generation telescopes such as NASA's Nancy Grace Roman Space Telescope and the ESA's Euclid mission.

via Universe Today|

#astronomy #cosmic-distance-ladder #dark-energy

astronomy2 years ago•4 min saved

"Resolving the Universe's Expansion Paradox: Webb and Hubble Find Common Ground"

The James Webb Space Telescope has confirmed the accuracy of the Hubble Space Telescope's measurements of the expansion rate of the universe, known as the Hubble constant, further intensifying the "Hubble tension" as it conflicts with other measurements. By observing Cepheid variables in distant galaxies, the JWST has ruled out potential measurement errors and interstellar dust as causes of the discrepancy, leaving cosmologists to consider the possibility of new physics to explain the paradox. The team's results were published in The Astrophysical Journal Letters.

via Space.com|

#astronomy #cosmic-distance-ladder #hubble-space-telescope

astronomy2 years ago•8 min saved

Webb Space Telescope Unveils New Insights into the Hubble Constant Tension

The "Hubble Tension," which refers to the discrepancy between the observed and predicted expansion rate of the universe, remains a mystery. The James Webb Space Telescope (JWST) has provided new measurements to refine the Hubble constant, but questions persist about the universe's rapid expansion and potential underlying cosmic phenomena. Webb's infrared vision has allowed for more precise observations of Cepheid variables, which are used as distance markers, and has confirmed the accuracy of previous Hubble measurements. However, the cause of the Hubble Tension, whether it be exotic dark energy, dark matter, a revision to our understanding of gravity, or measurement errors, remains unknown.

via SciTechDaily|

#astronomy #cepheid-variables #cosmic-distance-ladder

astronomy2 years ago•3 min saved

Revolutionizing Distance Measurement in the Universe: Introducing Baryon Acoustic Oscillations

Astronomers have developed a new technique using Baryon Acoustic Oscillations (BAO) to measure cosmic distances with greater precision. By analyzing one million galaxies, the team found that BAOs can be used to accurately map the Universe and determine the separation between galaxies. This method could help resolve the Hubble Tension and provide insights into the expansion of the Universe, Dark Matter, Dark Energy, and the behavior of gravity on large scales.

via Universe Today|

#astronomy #baryon-acoustic-oscillations #cosmic-distance-ladder

astronomy2 years ago•7 min saved

Unveiling the Expanding Universe: JWST Data Deepens Hubble Tension

New data from NASA's James Webb Space Telescope (JWST) has confirmed and intensified the "Hubble tension," a discrepancy between two different methods of measuring the expanding rate of the universe. The JWST observations of Cepheid variable stars in nearby galaxies, combined with measurements of type Ia supernovae, have reduced uncertainties and validated previous findings from the Hubble Space Telescope. The data suggests that the expansion rate is around 67 km/s/Mpc, in contrast to the value of 73 km/s/Mpc obtained from the cosmic distance ladder method. The discrepancy deepens the mystery surrounding the true expansion rate of the universe.

via Big Think|

#astronomy #cepheid-variables #cosmic-distance-ladder

astronomy3 years ago•3 min saved

Einstein's effect causes supernova to appear multiple times.

An international team of astronomers led by Ariel Goobar of the Oskar Klein Centre at Stockholm University discovered an unusual Type Ia supernova, SN Zwicky (SN 2022qmx), and observed it four times thanks to a gravitational lens. The team observed an “Einstein Cross,” a phenomenon predicted by Einstein’s Theory of General Relativity where the presence of a gravitational lens in the foreground amplifies light from a distant object. The discovery of SN Zwicky presents numerous opportunities for astronomers, including the ability to study it in greater detail and further investigate the mysteries of gravitational lenses.

via Inverse|

#astronomy #cosmic-distance-ladder #dark-energy

astronomy3 years ago•3 min saved

Multiple Views of Supernova Captured Through Gravitational Lensing.

Astronomers have observed an unusual Type Ia supernova, SN Zwicky, four times thanks to a gravitational lens, an unusual phenomenon predicted by Einstein's Theory of General Relativity. The team observed it with the Zwicky Transient Facility, the adaptive optics at the W.M. Keck Observatory, and the Very Large Telescope. The Hubble Space Telescope confirmed that the multiple-image lensing effect resulted from a galaxy in the foreground that magnified the supernova 25 times. This discovery presents numerous opportunities for astronomers, including the ability to study SN Zwicky in greater detail and further investigate the mysteries of gravitational lenses.

via Universe Today|

#astronomy #cosmic-distance-ladder #dark-energy

science-and-astronomy3 years ago•6 min saved

New measurement of universe's expansion worsens 'Hubble trouble'

The most accurate observation of distant stars that periodically change in brightness may deepen the "Hubble tension," a problem with the rate at which the universe expands. The observation confirms a disparity that exists between the two major methods of measuring how fast the universe is expanding, conforming with one but not the other. The Cepheid star measurement technique expands on other methods, such as one that relies on observations of Type 1a supernovas, and this new research has strengthened that rung. The improved calibration of the Cepheid variable measurement tool means that this technique finally "takes a side" in the Hubble tension debate, providing agreement with the "late time" solution.

via Space.com|

#cepheid-variable-stars #cosmic-distance-ladder #hubble-constant

astronomy3 years ago•5 min saved

New measurement of universe's expansion worsens 'Hubble trouble'

The most accurate observation of distant stars that periodically change in brightness may deepen the "Hubble tension," a problem with the rate at which the universe expands. The observation confirms a disparity that exists between the two major methods of measuring how fast the universe is expanding, conforming with one but not the other. Researchers used data collected by Europe's Gaia spacecraft to study Cepheid variable stars, which pulsate in a regular manner, providing a way of accurately measuring cosmic distances. The cosmic distance ladder is also used to measure the expansion rate of the universe, known as the Hubble constant.

via Yahoo News|

#astronomy #cepheid-variable-stars #cosmic-distance-ladder

astronomy3 years ago•5 min saved

"Revolutionizing Our Understanding of the Universe through Extra Dimensions and Quantum Mechanics"

A new study by the Stellar Standard Candles and Distances research group has achieved the most accurate calibration of Cepheid stars for distance measurements to date based on data collected by the European Space Agency's Gaia mission. This new calibration further amplifies the Hubble tension, which refers to the discrepancy of 5.6 km/s/Mpc in the measurement of the cosmic expansion rate based on the echo of the Big Bang (CMB) or direct measurement based on today's stars and galaxies. The study confirms the 73 km/s/Mpc expansion rate and provides the most precise, reliable calibrations of Cepheids as tools to measure distances to date. The discrepancy has implications for the understanding of the basic physical laws that govern the universe, including the exact nature of dark energy, the time-space continuum, and gravity.

via Phys.org|

#astronomy #cepheid-stars #cosmic-distance-ladder