|Quickly & correctly answer 42 skill problems in a row (time limit depends on skill difficulty)|
|Energy point(s) awarded||1500|
Sub-light Speed is an Earth badge. To earn it, the user has to consecutively submit 42 correct answers in any exercise within the time limit, which depends on the difficulty of the skill. Having a slow or incorrect answer means that the user has to start all over again. User can find the time limits for each exercise here. This badge can be found here on Khan Academy.
This badge, as all Speed Badges, can be earned only once per exercise.