This video describes the bright lunar explosion that happened on March 17, 2013 when 40 kg heavy object hit the lunar surface in location called Mare Imbrium.
Anybody who was looking at the Moon at the moment of impact could see the blast–with naked eye. The impact site was glowing like a 4th magnitude star for about one second.
The 40 kg meteoroid measuring 0.3 to 0.4 meters wide hit the Moon traveling 56,000 mph. The resulting explosion was equivalent to 5 tons of TNT.
“The Moon has no oxygen atmosphere, so how can something explode? Lunar meteors don’t require oxygen or combustion to make themselves visible. They hit the ground with so much kinetic energy that even a pebble can make a crater several feet wide. The flash of light comes not from combustion but rather from the thermal glow of molten rock and hot vapors at the impact site.”