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This almost makes me dizzy: https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field#/media/File:XDF-scale.jpg https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Fiel

This almost makes me dizzy: https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field#/media/File:XDF-scale.jpg https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field#/media... (it's a picture of the night sky showing what exactly Hubble was imaging with the Moon for scale) I never really understood how XDF is only that tiny patch of the sky and yet it has a godzillion of galaxies inside it!

ctdonath 6y ago
TIL: Moon covers 0.5°.
- brianpan 6y ago
  The Sun- also 0.5°
  - alejohausner 6y ago
    Wow, they're both the same size! What a cool coincidence! Just think what would happen if the moon passed exactly in front of the sun! Has it ever happened? Has anybody looked up at the sky when this happened? I wonder what it looks like.
    - nojvek 6y ago
      Yeah full solar eclipses are a lot of fun. I had an experience in Seattle a couple of years ago. They perfectly align and all you see is a thin ring from the sun flares. In that perfect eclipse, you can look at the sun with the naked eye and it’s beautiful and humbling. Like the day suddenly turns into a night for a few minutes. The TV series “Heroes” was all about this eclipse. It’s a fun show if you enjoy this kind of things.
      - titzer 6y ago
        I witnessed the 2017 total solar eclipse in person. Very eery feeling. It's worth noting that you should still not look at the sun during a total eclipse as the corona is still bright enough to do damage, and your pupils are dilated.
      - mixmastamyk 6y ago
        > look at the sun with the naked eye Not recommended.
    - sukilot 6y ago
      Only for the lucky 50million-ish year window we are currently in https://astronomy.com/magazine/ask-astro/2000/10/why-is-the-moon-exactly-the-same-apparent-size-from-earth-as-the-sun-surely-this-cannot-be-just-coincidence-the-odds-against-such-a-perfect-match-are-enormous https://astronomy.com/magazine/ask-astro/2000/10/why-is-the-...
mkl 6y ago
The full resolution versions of the public domain images from the article are on that page: https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field Unlike the lower resolution versions National Graphic scoldingly claims are under copyright when you right click to try and view the full image.

ctdonath 6y ago

TIL: Moon covers 0.5°.

brianpan 6y ago
The Sun- also 0.5°
- alejohausner 6y ago
  Wow, they're both the same size! What a cool coincidence! Just think what would happen if the moon passed exactly in front of the sun! Has it ever happened? Has anybody looked up at the sky when this happened? I wonder what it looks like.
  - nojvek 6y ago
    Yeah full solar eclipses are a lot of fun. I had an experience in Seattle a couple of years ago. They perfectly align and all you see is a thin ring from the sun flares. In that perfect eclipse, you can look at the sun with the naked eye and it’s beautiful and humbling. Like the day suddenly turns into a night for a few minutes. The TV series “Heroes” was all about this eclipse. It’s a fun show if you enjoy this kind of things.
    - titzer 6y ago
      I witnessed the 2017 total solar eclipse in person. Very eery feeling. It's worth noting that you should still not look at the sun during a total eclipse as the corona is still bright enough to do damage, and your pupils are dilated.
    - mixmastamyk 6y ago
      > look at the sun with the naked eye Not recommended.
  - sukilot 6y ago
    Only for the lucky 50million-ish year window we are currently in https://astronomy.com/magazine/ask-astro/2000/10/why-is-the-moon-exactly-the-same-apparent-size-from-earth-as-the-sun-surely-this-cannot-be-just-coincidence-the-odds-against-such-a-perfect-match-are-enormous https://astronomy.com/magazine/ask-astro/2000/10/why-is-the-...

mkl 6y ago

The full resolution versions of the public domain images from the article are on that page: https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field https://en.wikipedia.org/wiki/Hubble_Ultra-Deep_Field Unlike the lower resolution versions National Graphic scoldingly claims are under copyright when you right click to try and view the full image.