Imagine trying to reconstruct the history of a city by studying only its oldest surviving buildings.
Sandeep K S
Mar 3
1 min read
Exploring Galactic Archaeology: This infographic delves into the ancient structures of the Milky Way, highlighting the role of RR Lyrae variable stars as cosmic lighthouses. It revisits the traditional understanding of galactic formation by suggesting simultaneous layer development of the halo, thick, and thin disks. The Gaia satellite's data aids in mapping a billion stars, offering insights into the Milky Way’s history and its connection with Andromeda.
Astrophysicists have completed ASTRID, the largest cosmological hydrodynamic simulation ever run, tracing the universe from the cosmic dawn ($z=99$) down to the present day ($z=0$). By resolving 166 billion particles across 815 million light-years, ASTRID unveils how supermassive black holes co-evolve with galaxies and sculpt the cosmic web.
Scientists have uncovered the first robust evidence of a black hole and neutron star crashing together while orbiting in an oval path, challenging long-standing assumptions about cosmic pair formation.
Most neutron star-black hole pairs are expected to adopt circular orbits long before merging, their orbits slowly rounded out by the constant emission of gravitational waves over millions of years.
Far from the warmth of any star, moons orbiting rogue gas giants might harbor oceans of liquid water—and potentially complex life—for billions of years.
Liquid water is considered essential for life. Surprisingly, however, stable conditions that are conducive to life could exist far from any sun.
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