Board Thread:Off-Topic/@comment-25166554-20140516230348

You think about your sun as an average-sized star. It's very small compared to these stars:

Sirius A is about 660 million kilometers long, about 5 times bigger than the sun.

UY Scuti is about 26 billion kilometers long, about 20 times bigger than the sun.

R136A1 is about 1024 kilometers long, about 125,000 times bigger than the sun.

VY Canis Majoris is about 1030 kilometers long, about 500,000 times bigger than the sun.

Size of (exo)planets

Terrestial Planets 

Moon: 3,500 kilometers

Mercury: 7,400 kilometers

Venus: 15,000 kilometers.

Earth: 30,000 kilometers.

Mars: 24,000 kilometers.

Gas giants

Jupiter: 145,000 kilometers.

Saturn: 100,000 kilometers.

Uranus: 75,000 kilometers

Neptune: 50,000 kilometers

Drawf planets:

Pluto: 3,000 kilometers

Charon: 1,500 kilometers

Eris: 5,000 kilometers

Sedna: 1,000 kilometers

Ceres: 300 kilometers

Exoplanets:

HD 109906: 15,950,000 kilometers 