Conjunction

There is little air blast in Space.

According to NASA

The Dart mission only used a spacecraft to hit an asteroid and the results according to NASA are that the bump moved the course of the test target was changed.

There is little atmosphere in space and is generally referred to as a vacuum. We are used to seeing the results of explosives as they work on air blasts with destructive force. This may mean that atomic weapons would be muted as an asteroid breaker but it’s very hopeful to have the ability to intercept them.