The star doesn't crack and by the way they are not stars they are meteoroids which is fallen into earths atmosphere due to the gravity of earth

Understanding Star Cracks
When we refer to "star cracks," it's important to clarify that we are often discussing phenomena related to stars, such as supernovae or stellar explosions. Here's a detailed explanation of why these events occur.
What Causes Star Cracks?
- Stellar Evolution: Stars undergo a lifecycle where they burn through their nuclear fuel. As they approach the end of their lives, changes in their core can lead to instability.
- Nuclear Fusion: In massive stars, the core's pressure and temperature rise, causing rapid nuclear fusion. When the fuel is exhausted, the core collapses.
- Supernova Explosions: This collapse can trigger a supernova, an explosion that releases tremendous energy and can be seen across vast distances.
Types of Stellar Events
- Type II Supernova: Occurs in massive stars (more than eight times the mass of the Sun) after their hydrogen fuel is depleted.
- Type Ia Supernova: Happens in binary systems where a white dwarf accumulates matter from a companion star, leading to a runaway fusion reaction.
Visual Effects of Star Cracks
- Bright Light: These explosions can outshine entire galaxies and are visible even from billions of light-years away.
- Nebula Formation: The remnants often create beautiful nebulae, which can lead to new star formation.
Conclusion
Understanding these stellar phenomena helps astronomers study the universe's evolution and the life cycles of stars. The "cracks" in the sky represent the immense power of nature and the ongoing process of cosmic rebirth.