Tag #Astrophysics

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elpais.com

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Dec 26, 16:08

Cosmic Rotation: Not Everything Spins

Celestial bodies like planets and stars rotate, often inheriting spin from their formation. However, not all structures, such as cosmic filaments, rotate; galaxies form through matter aggregation in a rotating plane, unlike filaments. Subatomic 'spin' is not actual rotation.

Cosmic Rotation: Not Everything Spins

Celestial bodies like planets and stars rotate, often inheriting spin from their formation. However, not all structures, such as cosmic filaments, rotate; galaxies form through matter aggregation in a rotating plane, unlike filaments. Subatomic 'spin' is not actual rotation.

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What are the primary mechanisms driving the rotation of celestial bodies, and what are the exceptions to this rule?

Many celestial bodies, including planets, stars, and even galaxies, rotate. This rotation often originates from their progenitor, with collapsing stars spinning faster, similar to a figure skater pulling in their arms. However, not all cosmic structures rotate; filaments in the cosmic web, for instance, do not exhibit rotation.

forbes.com

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Dec 7, 13:06

Exoplanet Atmosphere Research: From Hot Jupiters to Exo-Earths

In 1995, Swiss astronomers discovered 51 Pegasi b, a hot Jupiter orbiting a sunlike star every 4.2 days, initiating the characterization of exoplanet atmospheres and paving the way for future exo-Earth studies using advanced telescopes like James Webb.

Exoplanet Atmosphere Research: From Hot Jupiters to Exo-Earths

In 1995, Swiss astronomers discovered 51 Pegasi b, a hot Jupiter orbiting a sunlike star every 4.2 days, initiating the characterization of exoplanet atmospheres and paving the way for future exo-Earth studies using advanced telescopes like James Webb.

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How do studies of hot Jupiters' atmospheres contribute to a broader understanding of exoplanet formation and evolution?

The study of hot Jupiters' atmospheres provides crucial insights into exoplanet formation and evolution. By analyzing atmospheric compositions of hundreds of planets with varying ages and metallicities, astronomers identify population-level trends. These trends help infer distinct formation and evolution scenarios for different exoplanet groups, improving our understanding of planetary systems beyond our solar system.

pda.kp.ru

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Dec 2, 13:45

Milky Way's Dark Matter Abundance Challenges Cosmological Models

A new study reveals that our Milky Way galaxy possesses an unusually high concentration of dark matter compared to other similar galaxies, challenging previous assumptions about the typicality of our cosmic environment.

Milky Way's Dark Matter Abundance Challenges Cosmological Models

A new study reveals that our Milky Way galaxy possesses an unusually high concentration of dark matter compared to other similar galaxies, challenging previous assumptions about the typicality of our cosmic environment.

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Life on Land

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How does the unusual abundance of dark matter in our galaxy affect its evolution and the formation of its satellite galaxies?

Our galaxy, unlike others of its type, is rich in dark matter, a substance that interacts minimally with ordinary matter but significantly influences galaxy formation. This high concentration of dark matter may explain the unique characteristics of our galaxy, such as its relatively small number of satellites and low rate of star formation.

dailymail.co.uk

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Dec 18, 19:11

Dormant Supermassive Black Hole Discovered in Early Universe

An international team used the James Webb Space Telescope to discover a supermassive black hole, 400 million times the mass of our Sun, in the early universe (800 million years after the Big Bang), currently in a dormant state, challenging existing black hole growth models.

Dormant Supermassive Black Hole Discovered in Early Universe

An international team used the James Webb Space Telescope to discover a supermassive black hole, 400 million times the mass of our Sun, in the early universe (800 million years after the Big Bang), currently in a dormant state, challenging existing black hole growth models.

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How does the discovery of this dormant black hole challenge existing models of black hole growth, and what alternative model is proposed?

This discovery challenges existing models of black hole development. The researchers propose that black holes experience short periods of rapid growth followed by extended dormancy, with this black hole potentially 'eating' for 5–10 million years and 'sleeping' for roughly 100 million years. This low-activity state explains its detection despite its immense size and the difficulty of observing dormant black holes.

english.elpais.com

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Dec 7, 01:07

Observational Evidence for Dark Matter's Existence and Abundance

Observations of galactic rotation curves, gravitational lensing in galaxy clusters, and analysis of cosmic microwave background radiation consistently indicate dark matter constitutes approximately 85% of the universe's matter, strongly suggesting its existence despite its inability to interact with...

Observational Evidence for Dark Matter's Existence and Abundance

Observations of galactic rotation curves, gravitational lensing in galaxy clusters, and analysis of cosmic microwave background radiation consistently indicate dark matter constitutes approximately 85% of the universe's matter, strongly suggesting its existence despite its inability to interact with...

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What observational evidence definitively proves dark matter's existence, and what is its estimated proportion of the universe's matter?

Vera Rubin's 1977 observations of galactic rotation curves showed that stars' speeds remained constant far from galactic centers, contradicting Newtonian gravity's predictions unless unseen matter, estimated to be nine times the visible matter's mass, existed. This, along with gravitational lensing in galaxy clusters revealing only 20% luminous matter, and cosmic microwave background radiation analysis indicating over 80% dark matter, strongly supports its existence.

Showing 73 to 77 of 77 results