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Staring at the Same Light ( (おな) (ひかり) () Onaji Hikari o Mite) is the one hundred seventy first chapter of the Dr. Stone manga.


The chapter begins with Xeno and Senku collecting their knowledge of the Petrification and Why-man. Xeno is allowed to listen to Byakuya's record and wistfully recalls all of them. While everyone else on the ship is happy to just let them discuss science together, Chrome is eager to listen in on the scientists' conversation. Sneaking in using snacks as an excuse, he finds both of them blowing giant bubbles. Kaseki appears with a globe, and the scientists begin testing.

Using the bubbles, they plan to estimate the source of the petrification as it expands radially, similarly to blowing a bubble. They explain the scientific method to Chrome using an example of ghosts before getting to the real topic. Comparing the direction and time that Senku and Xeno got individually petrified along with the height of the ISS that didn't get hit, they can pinpoint the source of the beam.

At some point, Kohaku walks in to check on them, finding them all playing with bubbles as before and retreats. They establish that it travels at 32,000 kph, and that they're looking for a point 8,181 km farther away from Senku than Xeno at the time of petrification. The result? 3° 7' South latitude, 60° 1' West longitude is the origin of the beam.

Characters in Order of Appearance[]

Chapter Notes[]

  • Senku and Xeno collate information to pinpoint the source of the petrification.
    • Xeno listens to Byakuya's record.
  • Chrome joins them after catching them blowing bubbles.
  • The source of the petrification is found to be at 3° 7' South latitude, 60° 1' West longitude using the following data points:
  • Senku was petrified at 12:40pm, and Xeno was petrified at 8:25pm.
  • Accounting for time zones, there was a 15 minutes and 20 second gap between their respective petrificaitons.
  • The petrification beam is affected by gravity, and did not reach the ISS.
  • The time between seeing it on the horizon and the beam reaching them was 56 seconds.
  • The beam is estimated to be 20,000 meters tall.
  • The beam travels at 32,000 kph.
  • The beam approached Xeno at east-southeast (110° on the compass), and Senku at north-northeast (33-34° on the compass).

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The Truth of the Petrification Saga
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