Mars was 88 million km away from earth when photographed by Hubble Space Telescope
On 19 Dec 2007, 7:45 UT+8, Mars was at the closest approach to us until 2016. I was having my birthday party on the 18 Dec night. Sadly, the clouds were jealous that the Goddess of the Wars, Mars was going to celebrate my birthday with my fellow friends. 
This color image was assembled from a series of exposures taken within 36 hours of the Mars closest approach with Hubble’s Wide Field and Planetary Camera 2. More about the info of the image is below.
Mars and Earth have a “close encounter” about every 26 months. These periodic encounters are due to the differences in the two planets’ orbits. Earth goes around the Sun twice as fast as Mars, lapping the Red Planet about every two years. Both planets have elliptical orbits, so their close encounters are not always at the same distance. In its close encounter with Earth in 2003, for example, Mars was about 20 million miles closer than it is in the 2007 closest approach, resulting in a much larger image of Mars as viewed from Earth in 2003.
The two dominant dark swatches seen just south of the equator on this part of the planet are well observed regions that were originally labeled by early Mars observers. The large triangular shape to the right is Syrtis Major. The horizontal lane to the left is Sinus Meridani. One of NASA’s Mars Exploration Rovers, named “Opportunity,” landed at the western end of this region in January 2004. At the intersection of these two features is the prominent Huygens crater with a diameter of 270 miles (450 kilometers). South of Huygens is the Hellas impact basin, with a diameter of 1,100 miles (1,760 km) and a depth of nearly 5 miles (8 km). Hellas was formed billions of years ago when an asteroid collided into the Mars surface.
Copied from HubbleSite.org
