The temperature on Mercury varies so extremely that it will rise up to 430C during the day and drop as low as -140C at night. Submitted by: King Sid - Hyderabad, India
The largest known star VY Canis Majoris is so big that if our Sun were a ball 117 cm (46 in) wide, Canis Majoris would be 2.25 kilometres (1.3 miles) wide. Submitted by: Colin - Portland, Oregon, United States.
The Pistol Star is the most luminous star known - 10 million times the power of the Sun and as big as the size of Earth's entire orbit around the Sun. Submitted by: Ankita, Manaal and Anisha - Dubai, United Arab Emirates.
Mars is red because its soil is very rusty (iron oxide.) Submitted by: Ankita Lalwani - Dubai, United Arab Emirates.
Crux is the smallest of modern constellations, with only 4 bright stars. Submitted by: Chris Jimms
The largest of modern constellations is Hydra. Submitted by: Chris Jimms
Earth is the only planet not named after a Roman or Greek god. Submitted by: Jacob - Ohio, Unites States.
Saturn's moon Titan has hundreds of times more oil and natural gas than all the known reserves on Earth.
Interstellar space is not complete vacuum: there are a few hydrogen atoms per cubic centimetre. Submitted by: Sruthi R - Coimbatore, India
If a pinhead-size piece of the Sun were placed on Earth, one would have to stand as far as 145 kilometres (90 miles) away to be safe. Submitted by: Sruthi R - Coimbatore, India
The star "Lucy" in constellation Centaurus is actually a huge cosmic diamond of 10 billion trillion trillion carats. Submitted by: Sruthi R - Coimbatore, India
A neutron star has such density that a teaspoonful of its matter would weigh more than all the people on Earth. Submitted by: Sruthi R - Coimbatore, India
Even though it is closest to the Sun, Mercury has ice in its craters. Submitted by: Jeuel
Due to its size, Pluto's moon Charon is also considered to be a double dwarf planet (two planets orbiting each other), rather than a moon orbiting its planet. Submitted by: Jeuel
Jupiter is so big that twice the mass of the rest of our Solar System's planets combined would still not be enough to equal its mass.
Made up of billions of pieces of ice, the average thickness of each of Saturn's seven giant rings only ranges from about 200 to 3000 metres.
The deepest surface point on Mars is Hellas, about 3 km deep.
Pluto is no longer considered a planet. It is now known as a "Dwarf Planet". Submitted by: Saphira - Lancaster, Ohio, United States
The full Moon always rises at sunset and sets at sunrise.
About 1000 Earths would fit inside Jupiter - and the Sun could hold about 1000 Jupiters.