That's not quite right. Sirius, while being the brightest star in our night sky, is actually slightly smaller than our Sun.

Here's the breakdown:

* Sirius A (the main star): It's about 1.7 times the mass of our Sun and about 1.7 times its diameter.

* Sirius B (a white dwarf companion): It's much smaller, roughly the size of the Earth, but with about the same mass as the Sun.

So, while Sirius A is larger than our Sun, it's not 10 times bigger. The reason Sirius appears so bright is that it's much hotter and more luminous than our Sun.