Priya Natarajan, an acclaimed astrophysicist renowned for her research on black holes, joins to explore the captivating nature of these cosmic enigmas. She explains how supermassive black holes, which only had their origins confirmed recently, challenge our understanding of physics. The conversation touches on the odd experiences of falling into a black hole, including spaghettification and gravitational lensing. Additionally, Priya reveals new theories around their formation, highlighting their crucial role in galaxy evolution.
Supermassive black holes likely originate from massive seeds formed from collapsing gas in early galaxies, reshaping our understanding of cosmic evolution.
Falling into a supermassive black hole allows for a unique perception of the universe through light bending before experiencing drastically altered space and time.
Deep dives
The Nature and Origin of Black Holes
Black holes are formed from compact objects whose mass creates a puncture in the fabric of space-time, with different types categorized based on their mass. Traditionally, stellar mass black holes originate from the collapse of dying stars; however, supermassive black holes presented a mystery regarding their formation. Recent studies suggest that unlike their smaller counterparts, supermassive black holes could begin life as massive seeds formed from clouds of collapsing gas in early galaxies. This theory positions black holes as essential components in the cosmic framework, crucial for understanding the evolution of galaxies.
Experience of Falling Into a Black Hole
Falling into a black hole involves extreme gravitational effects that alter the perception of space and time. An individual falling into a stellar mass black hole would undergo 'spaghettification,' where the difference in gravitational pull would stretch the body apart like spaghetti. In contrast, a fall into a supermassive black hole would be less immediately fatal, allowing the person to perceive the entire universe around them through extreme light bending until they eventually cross the event horizon. Once past this point, they would be unable to escape, as space and time would behave drastically differently, leading to a chillingly slowed experience of time.
Recent Discoveries and Implications of Black Holes
Newly available observational evidence from advanced telescopes like the James Webb Space Telescope has lent support to theories about the origins of supermassive black holes. The detection of UHC-1, a young galaxy hosting a supermassive black hole formed from a gas cloud, corroborated earlier theoretical propositions made nearly two decades ago. This discovery highlights the significant role black holes play in the universe, shifting the perspective from viewing them as marginal entities to recognizing their central importance in cosmic structure and evolution. Understanding how black holes form and interact deepens the comprehension of the universe's history and structure.
Black holes are one of the most mysterious cosmological phenomena out there. Astrophysicist Priya Natarajan calls them "the point where all known laws of physics break down."
On the list of perplexing qualities: The origins of supermassive black holes. That story was only confirmed within the last year.
Check out more of our series Space Camp on the weird and mysterious in space at npr.org/spacecamp.