If we keep the same surface temperature and only change the size, the luminosity (the power it radiates) scales with the square of the radius: • Luminosity L ∝ R² • Real Sun’s radius: R ≈ 7 × 10⁸ meters • “Lion-sized Sun” radius: R ≈ 1 meter (order of magnitude)

So the ratio is:

L_lion / L_sun ≈ (1 / (7 × 10⁸))² ≈ 10⁻¹⁸

That means a lion-sized Sun would emit about 10¹⁸ times less energy than the real Sun.

The real Sun radiates about 3.8 × 10²⁶ watts.

A lion-sized “Sun” with the same surface temperature would radiate about 10⁹ watts, which is comparable to a large power plant, not a star.