News for hackers. Stuff that matters.

A comment on Physicists observationally confirm Hawking’s black hole theorem for first time. Parent comment

Re:Physicists observationally confirm Hawking’s black hole t... by eru on Thursday July 01, 2021 @06:41AM (#27697879)
It's fascinating what's possible.

For example, we know more about the chemical composition of other galaxies than we know about the centre of the earth. Just because we can infer so much from their light spectrum.

(For empirical information about the centre of the earth, we are basically limited to seismic data and perhaps the magnetic field and bumps in gravity?)

[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by DSingularity on Thursday July 01, 2021 @09:58AM (#27699097)
Why not launch a probe and point its sensors at earth?
[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by db48x on Thursday July 01, 2021 @11:16AM (#27699939)
The Earth is opaque. I don’t have a source to cite for this, but I think you can check it easily enough.
[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by eru on Sunday July 04, 2021 @04:36AM (#27728147)
https://www.answers.com/Q/Is_the_earth_opaque
[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by nine_k on Thursday July 01, 2021 @02:49PM (#27702913)
We hardly resolve any individual stars in other galaxies (maybe some giant stars inside Andromeda?), so our idea of chemical composition of other galaxies is very... averaged.

We barely can resolve largest and closest exoplanets into a few pixels.

[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by floxy on Thursday July 01, 2021 @04:42PM (#27704548)
>We barely can resolve largest and closest exoplanets into a few pixels

For now...

https://arxiv.org/abs/1802.08421

https://www.youtube.com/watch?v=NQFqDKRAROI

[ Parent | on HN ]
Re:Physicists observationally confirm Hawking’s black hole t... by nine_k on Friday July 02, 2021 @05:26AM (#27709493)
This is seriously cool.

This also requires a helluva lot of delta-V from the telescope to realign with another planet.

[ Parent | on HN ]