Neutron Stars: More Mass Than the Sun

How can neutron stars hold more mass than the Sun in a city-sized sphere? Explore neutron star density, pulsars, light bending, and the collisions that help create heavy elements. 00:00 A Star Smaller Than a City 01:00 When the Core Gives Way 02:00 Mass Is Not the Same as Size 03:00 A Surface That Bends Light 04:00 Why a Dead Star Can Flash 05:00 Reading the Clock 06:00 The Interior We Cannot Photograph 07:00 When Two Neutron Stars Meet 08:00 A Collision Written in Gold 09:00 Small Object, Enormous Questions Follow a massive stellar core from collapse to a compact remnant. Learn how pulse timing, NICER X-rays and gravitational waves reveal what we can measure, and what remains unknown about the deepest interior. Scientific sources: https://science.nasa.gov/universe/sta... https://science.nasa.gov/exoplanets/s... https://science.nasa.gov/universe/sto... https://svs.gsfc.nasa.gov/13240/ https://assets.science.nasa.gov/conte... https://www.ligo.caltech.edu/page/pre... https://www.ligo.caltech.edu/news/lig... https://svs.gsfc.nasa.gov/11530/ https://science.nasa.gov/science-rese... Visual credits: NASA Goddard / CI Lab — https://svs.gsfc.nasa.gov/12949/ NASA Goddard / AEI / ZIB — https://svs.gsfc.nasa.gov/11530/ NASA Goddard / D. Skiathas — https://svs.gsfc.nasa.gov/14884/ NASA Goddard — https://svs.gsfc.nasa.gov/13240/ NASA Goddard — https://svs.gsfc.nasa.gov/13240/ NASA Goddard / CI Lab — https://svs.gsfc.nasa.gov/20413/ NASA Goddard / CI Lab — https://svs.gsfc.nasa.gov/13156/ NASA Goddard — https://svs.gsfc.nasa.gov/13832/ (NICER 2021 mass–size and city-size constraint animations) Original explanatory graphics, script and procedural music/effects: OrbitCut. NASA sequences are labeled artist concepts, model visualizations or numerical simulations; no source audio used. The NICER constraint animations show the 2021 analysis; the chart horizontal axis is diameter in kilometers. Synthetic English narration. Thumbnail is an AI-generated concept and size comparison, not a real star above a city. NASA and partner institutions do not endorse this video. #NeutronStars #SpaceDocumentary #Pulsars