I don't see anything that suggests a laser is being used in space. At 1:24 in the video, it says starlight is used. Only stars are mentioned in the press releas

I don't see anything that suggests a laser is being used in space. At 1:24 in the video, it says starlight is used. Only stars are mentioned in the press releases: https://www.universetoday.com/154623/heres-exactly-how-engineers-are-aligning-jwsts-segmented-mirror https://www.universetoday.com/154623/heres-exactly-how-engin... On the ground, you can easily place a laser in an optically identical position as a star (near infinity). In space, I don't think this would be possible, since it would require that the laser, and the optics that would be required, would all be within a fraction of a wavelength of the true optical path. In the end, you would still need to align to a star anyways. Interferometry works just fine with starlight.