Is there an unidentified satellite, known as the Black Knight satellite, in a retrograde orbit around the Earth?
closed as off-topic by Oddthinking♦ Dec 18 '18 at 6:43
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Skeptics Stack Exchange is for challenging notable claims, such as pseudoscience and biased results. This question might not challenge a claim, or the claim identified might not be notable." – Oddthinking