Comet, rocket, space junk or meteor? Here’s how to tell your fireballs apart

There’s a blaze of light across the sky! A fireball is seen by thousands, and mobile phone and dashcam footage soon appears on social media.

But what have people just seen? A mix of social media hashtags suggests confusion about what has streaked overhead. Was it a Soviet Venus probe? Was it one of Elon Musk’s satellites or rockets?…

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