Attention Deficit Disorder Prosthetic Memory Program

Hellas Planitia

ADDPMP721

A plain located within the huge, roughly circular impact basin Hellas, itself located in the southern hemisphere of the planet Mars. Due to its size and its light colouring, which contrasts with the rest of the planet, Hellas Planitia was one of the first Martian features discovered from Earth by telescope, in the 19th century.

Hellas is the third or fourth-largest known impact crater in the Solar System. The basin floor is about 7,152m (23,465ft) deep and extends about 2,300km (1,400 miles) east to west. With a diameter of about 2,300km (1,400 miles), it is also the largest unambiguous impact structure on Mars. Hellas Planitia is thought to have been formed during the Late Heavy Bombardment period of the Solar System approximately 4.1 to 3.8bn when a protoplanet or large asteroid hit the surface.

Hellas Planitia - © Attention Deficit Disorder Prosthetic Memory Program
Hellas Planitia - © Attention Deficit Disorder Prosthetic Memory Program
Hellas Planitia - © Attention Deficit Disorder Prosthetic Memory Program
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