VISUAL ARCHIVE / IMAGE STORY
A Horizon Beyond Familiar Scale
A comparison with the Solar System makes an enormous inferred mass easier to contemplate.
An illustrative comparison of TON 618’s event horizon with the scale of our planetary system. Published mass estimates imply a black-hole diameter of approximately 240 to 390 billion kilometers. The diagram is conceptual and is not drawn to one consistent astronomical scale.
THE OBSERVATION
What we can actually see.
The horizon size of a nonrotating black hole scales with its mass. Applying this relation to TON 618 requires a chosen mass estimate; published estimates depend on the spectroscopy and calibration, so the diagram is not a precise measuring chart.
THE ILLUSTRATION
What the artwork imagines.
The composition visualizes this idea: A comparison with the Solar System makes an enormous inferred mass easier to contemplate. An illustrative comparison of TON 618’s event horizon with the scale of our planetary system. Published mass estimates imply a black-hole diameter of approximately 240 to 390 billion kilometers. The diagram is conceptual and is not drawn to one consistent astronomical scale.
FROM THE ILLUSTRATED ARTICLE
The story that inspired it.
The article traces TON 618 from a cataloged blue source to a distant quasar, then asks how spectroscopy and mass calibration change estimates of the enormous central black hole. Its comparisons make the scale vivid while keeping the uncertainty visible. This frame focuses on a comparison with the Solar System makes an enormous inferred mass easier to contemplate.
Read TON 618: The Black Hole So Enormous That Astronomers Still Disagree About Its SizeCHECK THE RECORD
The image interprets the research below. Follow the original work for the measurements and limits behind the scene.
Research record: doi.org/10.1086/182182 Research record: arxiv.org/abs/astro-ph/0406559 Research record: doi.org/10.3847/1538-3881/ab0956 Research record: www.nasa.gov/universe/nasa-animation-sizes-up-the-universes-biggest-black-holes/ Research record: science.nasa.gov/mission/hubble/science/science-behind-the-discoveries/hubble-quasars/ Research record: science.nasa.gov/mission/webb/science-overview/science-explainers/what-are-active-galactic-nuclei/OTHER IMAGE STORIES
Keep looking.
The Light Around TON 618
A Blue Dot on a Plate
The Mark Shared by Titan and PlutoEXPLORE IN 3D / MAP G-01
Compare the darkness near home
The Galactic Center offers a nearby comparison for gravity, orbiting stars, and lensing. Its illustrated black hole is Sagittarius A*, not a reconstruction of the distant quasar TON 618.
Open Sagittarius A* map