1908, Siberia: ~2,000 km² of forest flattened, no crater. UFO crash? Antimatter? Mini black hole? Weigh it. A ~60-metre stony asteroid entering at ~20 km/s carries the kinetic energy of a large H-bomb — and because stone shatters under air pressure it detonates as an AIRBURST kilometres up, which is exactly why there’s no crater. Slide the body’s size and read the yield. Verdict: REAL event, natural cause.
Kinetic energy E = ½mv² of a stony asteroid (density ~3000 kg/m³) at ~20 km/s: a 60 m body carries ~16 megatons — matching the ~10–15 Mt inferred from the fell-pattern. Stony bodies fragment at a ram-pressure altitude of several km, depositing energy as an AIRBURST — no impact crater, exactly as observed (the 2013 Chelyabinsk airburst confirmed the mechanism live). A fail-loud self-check throws unless a ~60 m stony body yields 8–25 Mt. ◆ the EVENT is real and enormous; the extraterrestrial-craft / antimatter / black-hole claims are unnecessary — ordinary rock explains it. ▲ VERDICT: REAL (natural), alien-craft DEBUNKED.
Size/speed/density are within the accepted ranges (exact values debated); the airburst-not-crater logic and the megatonnage are the real content. ‘Real event’ means the blast happened — it does NOT license any of the exotic causes.