The biggest planet currently known in the universe is planet TrES-4. It is located in the constellation Hercules. It is 70% larger than Jupiter in diameter, but has only 80% of Jupiter's mass. As this planet orbits very closely around its sun, the gases of the planet expand due to the intense heat and cause the density of the planet to become similar to a marshmallow.
The largest known star in the observable universe is UY Scuti. It is located in the Constellation of Scutum.
It has a
- diameter of 1,500,000,000 miles,
- radius of 750,000,000 miles,
- circumference of 4,712,388,980 miles.