evidence: TORONTO -- A Russian cosmonaut aboard the International Space Station (ISS) has shared footage of what he describes as "space guests," or UFOs, that made an unexpected appearance in a time-lapse video he captured of the southern lights. [...] It’s unclear when exactly the footage was captured and if Vagner saw the UFOs when they appeared or later on the video. [...] According to a recent NASA blog post, Vagner was "exploring ways to improve Earth photography techniques" on Wednesday before he posted the time-lapse video. A subsequent blog post from the space agency did not make any mention of the footage and the apparent UFOs.