The space facts guides

• Planet Size Comparison: Every Planet From Smallest to Largest - All eight planets ordered smallest to largest by diameter, with radius, volume and mass relative to Earth. NASA Planetary Fact Sheet values.
• How Many Moons Does Each Planet Have? Current Confirmed Counts - Saturn has 293 confirmed moons, Jupiter 115, Uranus 29, Neptune 16, Mars 2, Earth 1, Mercury and Venus none. Full table with named vs unnamed counts.
• The Biggest Star in the Universe: How the Largest Known Stars Compare to the Sun - The largest known star is WOH G64 at about 1,540 solar radii. Ranked table with uncertainty ranges, diameters in km, distances and orbit comparisons.
• Hottest and Coldest Planets in the Solar System (Full Temperature Chart) - Venus is the hottest planet at 464 C (867 F); Neptune is the coldest at about -200 C. Full NASA temperature chart in C and F, with min and max.
• How Big Is a Black Hole? Size Comparison From Stellar-Mass to TON 618 - A black hole's event horizon radius is about 2.95 km per solar mass. Full size ladder from stellar-mass holes to Sagittarius A*, M87* and TON 618.
• How Long Does It Take to Get to Each Planet? Distances and Real Mission Times - Real flight times to every planet: Mars in 7 months, Jupiter in 5 years, Neptune in 12. Plus closest and farthest distances in km and miles.