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A sonic boom is the sound produced when an object breaks the sound barrier i.e when it travels faster than the speed of sound. When a body travels below the speed of sound (subsonic), the sound emitted by it travels in all directions.
Thunder â the cracking or rumbling you often hear â is caused by thermal expansion and contraction. Lightning bolts can get far hotter than the sunâs surface â up to 20,000Â° Celsius. That heats the air, causing it to expand, and starting a shock wave that moves as sound waves â thunder.