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This is a cliff on comet 67P/Churyumov–Gerasimenko. It's about 1 km tall. If you jumped from the top, it would take you 47 minutes to reach the bottom, and you'd probably be OK.

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This view is a mosaic comprising four images taken by the ESA Rosetta spacecraft's NAVCAM. At the time, the spacecraft was 20 km from the centre of the comet. The images were taken on 10 December 2014; the resolution is 1.71 m/pixel and the mosaic measures 2.9×2.6 km. Credit: ESA/NAVCAM/S. Atkinson

P.S. You'd reach the bottom travelling at around 70 cm per second. That's approximately the velocity you'd have by jumping off a step on Earth that's one inch high.

I’d be more than willing to take that leap if I could be 100% assured that I wouldn’t break a leg. I don’t want a broken leg on a comet hurtling past the Sun, millions of miles from home.

"On a neutron star, the gravity is so intense that an object dropped from a meter off the surface would accelerate to about a million km/h by the time it hit the surface. The gravity would be strong enough to pull your electrons into the nuclei of your atoms and convert your protons into neutrons."

AI had a bugger of a job fitting Croke Park into that image. (I recall it looked much smaller when I did this myself way back in the day, but I think AI might be right)

Too big, I think: call it 280 m along the long axis, so a little under four stacked end to end to make the cliff. Whereas this version looks like be 2.5 = the cliff.

"Cliff" is too much of a terracentric term to apply to something that's shaped like a dumbbell. 'Standing' at "the top" of that would surely be one of the ultimate "WTAF!" moments...

These are the days of miracle and wonder This is the long distance call The way the camera follows us in slo-mo The way we look to us all The way we look to a distant constellation That's dying in a corner of the sky These are the days of miracle and wonder - Paul Simon