Can a black hole be created from a star like our Sun?

In one line

The rule

Only stars much heavier than the Sun (about 20 times or more) can end their life as black holes after they explode as supernovae.

Let's understand it simply

Imagine you are rolling a big ball of atta (dough) for roti. If the ball is small, you can easily press it flat. But if the ball is huge and heavy, it is much harder to flatten—it pushes back with more force. A star is like that ball—its own weight tries to squeeze it smaller and smaller when it runs out of fuel.

Our Sun is like a medium-sized ball. When it finishes its fuel, it will shrink, but not enough to become a black hole. Instead, it will become a white dwarf—a very small, hot star. Only really massive stars, much bigger than the Sun, get squeezed so much by their own gravity that they collapse into a black hole—a point where gravity is so strong that nothing, not even light, can escape.

How it works

1. A star shines by burning hydrogen into helium in its core (center).
2. When the hydrogen runs out, the star starts burning heavier elements, but this cannot last forever.
3. The star's core contracts (shrinks) under its own gravity, while the outer parts may puff out.
4. For stars like the Sun, the core is not heavy enough to collapse further, so it becomes a white dwarf.
5. For very massive stars (about 20 times the Sun's mass or more), the core collapses completely, forming a black hole.
6. The outer layers are blown away in a huge explosion called a supernova (for massive stars).

The story behind it

The idea of black holes started with John Michell in 1783, who imagined a star so heavy that even light could not escape. But the real science began with Albert Einstein's theory of general relativity in 1915, which showed how gravity can bend space and time. In the 1930s, Subrahmanyan Chandrasekhar, an Indian scientist, calculated the maximum mass a white dwarf can have (about 1.4 times the Sun's mass, called the Chandrasekhar limit). If a star's core is heavier than this, it cannot become a white dwarf—it must collapse further, possibly into a black hole.

Where you see it in real life

• Supernova explosions: When a massive star dies, it explodes and may leave behind a black hole.
• X-ray binaries: Some black holes are found in pairs with normal stars, pulling matter from them and shining in X-rays.
• The center of our galaxy: There is a supermassive black hole at the center of the Milky Way, much bigger than any star.
• White dwarfs: Our Sun will become a white dwarf, not a black hole, after billions of years.
• Neutron stars: Stars heavier than the Sun but not massive enough for black holes become neutron stars—very dense, but not black holes.
• Science fiction movies: Black holes often appear in films, but not all details are correct!

Why it matters

• Understanding star life cycles: Knowing which stars become black holes helps us understand how elements are spread in the universe.
• Space technology: Black holes help test the laws of physics, like Einstein's theories.
• Astronomy: Finding black holes helps us map the universe and study extreme conditions.
• Future chapters/exams: This idea connects to gravity, relativity, and the structure of the universe in higher classes.

Worked example

Let's see what happens to a star like the Sun (mass = 1 solar mass) and a massive star (mass = 25 solar masses):

Given: Sun's mass = 1 solar mass
Step 1: Compare to Chandrasekhar limit (1.4 solar masses)
Step 2: Sun's core < 1.4 solar masses → becomes a white dwarf

Given: Massive star's mass = 25 solar masses
Step 1: After supernova, core > 3 solar masses
Step 2: Core collapses → becomes a black hole

Common mistakes

• Thinking any star can become a black hole: Only very massive stars can do this, not stars like the Sun.
• Confusing white dwarfs, neutron stars, and black holes: These are different end points for stars of different masses.
• Believing the Sun will explode as a supernova: The Sun is not massive enough; it will gently shed its outer layers and become a white dwarf.
• Assuming black holes "suck everything in": Black holes only affect things very close to them, not the whole universe.

Remember it

Only stars much heavier than the Sun can become black holes—the Sun will become a white dwarf, not a black hole.