File:Alcubierre drive passing in front of Earth.webm

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file(WebM audio/video file, VP9/Opus, length 29 s, 1,280 × 720 pixels, 492 kbps overall, file size: 1.7 MB)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description
English: "What it would look like if an Alcubierre drive were to pass in front of Earth, as viewed by an observer looking at Earth. The space ship in this video is a red sphere moving from left to right at a speed of 1.5 times the speed of light.

We see some interesting phenomena due to the fact that the ship is moving faster than light. When the ship is far off to the left, the radial velocity of the ship relative to the observer is greater than the speed of light. Due to this, the ship is not seen until the radial velocity of the ship is less than the speed of light. Once this happens, we see two images of the ship, one image moving left and one to the right. We also see significant gravitational lensing of the Earth due to the Alcubierre bubble.

The image of the ship stretches out and slows down as it moves to the right of the video. This is again a consequence of the ship moving faster than the speed of light, but the ship is moving away from the observer as it is emitting light.

Some parameters of the system:

  • The metric can be found on this page: https://en.wikipedia.org/wiki/Alcubierre_drive
  • The velocity is a constant 1.5c
  • Bubble thickness: sigma = 4/3
  • Bubble radius: R = 2
  • Red spherical ship at the center of the bubble
  • Camera is 5 bubble radii from the ship's closest approach
  • Camera horizontal aperture angle is 135 degrees

The same setup can be viewed with a grid background instead of an Earth background here: https://www.youtube.com/watch?v=ugvsiT0b7pw

To further explore the effects of a faster than light ship, see: https://www.youtube.com/watch?v=JP7ol...​

For more information, see http://www.black-holes.org/lensing"
Date
Source YouTube: Alcubierre drive passing in front of Earth – View/save archived versions on archive.org and archive.today
Author SXS Collaboration

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
YouTube logo This file, which was originally posted to YouTube: Alcubierre drive passing in front of Earth, was reviewed on 29 April 2021 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.

The bot only checks for the license, human review is still required to check if the video is a derivative work, has freedom of panorama related issues and other copyright problems that might be present in the video. Visit licensing for more information. If you are a license reviewer, you can review this file by manually appending |reviewer={{subst:REVISIONUSER}} to this template.

Creative Commons logo

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current13:38, 29 April 202129 s, 1,280 × 720 (1.7 MB)Prototyperspective (talk | contribs)Imported media from https://www.youtube.com/watch?v=hPrVjwDxQPY

The following page uses this file:

Transcode status

Update transcode status
Format Bitrate Download Status Encode time
VP9 720P 333 kbps Completed 13:39, 29 April 2021 24 s
Streaming 720p (VP9) 329 kbps Completed 08:33, 25 January 2024 1.0 s
VP9 480P 151 kbps Completed 13:45, 29 April 2021 19 s
Streaming 480p (VP9) 147 kbps Completed 18:28, 17 December 2023 1.0 s
VP9 360P 86 kbps Completed 13:45, 29 April 2021 14 s
Streaming 360p (VP9) 82 kbps Completed 01:27, 2 January 2024 1.0 s
VP9 240P 51 kbps Completed 13:45, 29 April 2021 10 s
Streaming 240p (VP9) 47 kbps Completed 19:56, 9 December 2023 1.0 s
WebM 360P 268 kbps Completed 13:45, 29 April 2021 8.0 s
Streaming 144p (MJPEG) 839 kbps Completed 01:24, 30 October 2023 2.0 s
Stereo (Opus) 3 kbps Completed 01:05, 15 November 2023 1.0 s
Stereo (MP3) 128 kbps Completed 11:06, 29 October 2023 1.0 s

File usage on other wikis

The following other wikis use this file:

Metadata