Spaghettification near a black hole
Claim in the list: As an object approaches an event horizon, it is stretched into a thin strand (spaghettification) because of the large difference in gravitational pull.
Verification: Broadly correct, but the location and outcome depend on black-hole mass and trajectory. Spaghettification is caused by tidal forces—the difference in gravitational acceleration between the near and far sides of an object. For a stellar-mass black hole, those forces can tear an object apart before it reaches the horizon; near a supermassive black hole, it could theoretically cross the horizon before tides become destructive, with disruption occurring deeper inside.
Conclusion: Spaghettification is caused by a gravity gradient, but it does not necessarily begin exactly at the event horizon.