Statements (21)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
astrophysical concept
general relativity concept |
| gptkbp:definedIn |
a spherical region of space where gravity is strong enough that photons are forced to travel in orbits
|
| gptkbp:enables |
gravitational lensing
photon orbits |
| gptkbp:exists_around |
black holes
compact massive objects |
| gptkbp:firstDescribed |
gptkb:James_Bardeen
|
| https://www.w3.org/2000/01/rdf-schema#label |
photon sphere
|
| gptkbp:not_stable_for |
massless particles
|
| gptkbp:observable_effect |
shadow of a black hole
|
| gptkbp:radius_for_Schwarzschild_black_hole |
1.5 times the Schwarzschild radius
|
| gptkbp:radius_formula |
r = 3GM/c^2 for non-rotating black holes
|
| gptkbp:relatedTo |
gptkb:ergosphere
event horizon accretion disk |
| gptkbp:studiedBy |
gptkb:general_relativity
astrophysics |
| gptkbp:unstable_orbits |
photons can escape or fall into the black hole
|
| gptkbp:bfsParent |
gptkb:Schwarzschild_metric_(when_charge_is_zero)
|
| gptkbp:bfsLayer |
6
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