Spacecraft nears comet

• If successful, the Rosetta mission will be the first to orbit and land on a comet


• Scientists hope to learn more about the composition of comets


• The robotic lander Philae is due to touch down in November


• Could comets have brought water to the Earth? Rosetta may help answer the question

London (CNN) -- After a 10-year chase taking it billions of miles across the solar system, the Rosetta spacecraft is homing in on its close encounter with a comet.

Pictures of the oddly-shaped rock have already been returned but on Wednesday scientists at the European Space Agency, which is leading the project, say they hope to see images from within about 75 miles as the probe carries out the last of its braking maneuvers.

If successful, the mission will notch up a series of firsts. Rosetta will be the first spacecraft to orbit a comet on its journey around the sun, and in November mission controllers aim to place the robotic lander Philae on the surface -- something that has never been done before.

After a 10-year chase taking it billions of miles across the solar system, the European Space Agency's Rosetta spacecraft is closing in on its target: Comet 67P/Churyumov-Gerasimenko. This image of the comet was taken on Friday, August 1. Rosetta will be the first spacecraft to orbit a comet, and in November the spacecraft will deploy a robotic lander to the comet's surface -- something that has never been done before.

Rosetta's mission started on March 2, 2004, when it was launched on a European Ariane 5 rocket from Kourou, French Guiana.

Rosetta is named after the Rosetta Stone, the black basalt that provided the key to deciphering Egyptian hieroglyphs. Scientists think the mission will give them new clues about the origins of the solar system and life on Earth. The mission is spearheaded by the European Space Agency with key support from NASA.

This photo shows Rosetta being tested before it was wrapped in insulating blankets and loaded on a rocket for launch.

Rosetta has massive solar wings to power the spacecraft. They were unfurled and checked out at the European Space Agency's test facilities before being packed up for liftoff.

After its closest approach to Earth in November 2007, Rosetta captured this image of the planet.

Rosetta snapped this image of Earth in November 2009. The spacecraft was 393,328 miles from Earth.

Rosetta passed asteroid Steins in September 2008, giving scientists amazing close-ups of the asteroid's huge crater. The asteroid is about 3 miles in diameter.

Rosetta took this image of Mars as it looped through the solar system.

This image was taken by an instrument on Rosetta's Philae lander just minutes before the spacecraft made its closest approach to Mars. Part of Rosetta and its solar arrays are visible.

On July 10, 2010, Rosetta flew about 1,864 feet from asteroid Lutetia, which is 10 times larger than asteroid Steins.

Look closely at the top of this picture. See that dot? That's Saturn. Rosetta snapped the picture of asteroid Lutetia and captured Saturn in the background.

After taking pictures of Earth, Mars and asteroids, Rosetta was put into hibernation in May 2011 after it reached the outer part of the solar system. Mission managers woke it January 20, 2014.

In November, Rosetta will become the first spacecraft to deploy a robot for a soft landing on a comet. It also will be the first probe to escort a comet into our inner solar system. This drawing shows how Rosetta will drop its robot lander, Philae, onto the comet.

The robot lander will fire harpoons to anchor itself to the comet. Scientists expect the lander to send back data to Earth for at least a week and possibly for many months as the comet heads toward the sun.

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

Rosetta: The comet chaser

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Rosetta: The comet chaser

Previous missions have performed comet fly-bys but Rosetta is different. This probe will follow the comet for more than a year, mapping and measuring how it changes as it is blasted by the sun's energy.

Mission controllers had to use the gravity of Earth and Mars to give the probe a slingshot acceleration to meet its target on the right trajectory. Rosetta also had to be put into hibernation for more than two years to conserve power before being woken up successfully in January this year.

Interactive: See how Rosetta chases the comet across the solar system

Scientists hope to learn more about the composition of comets and perhaps whether they brought water to the Earth or even the chemicals that make up the building blocks of life.

It really is such a step forward to anything that has come before

Matt Taylor, Rosetta project scientist

"It really is such a step forward to anything that has come before," project scientist Matt Taylor told CNN.

Rosetta will soon begin mapping the surface of Comet 67P/Churyumov-Gerasimenko and find out more about its gravitational pull. This will help to find a suitable landing site for Philae and allow engineers to keep Rosetta in the right orbit.

As comets approach the sun, any ice melts and is turned into an ionized gas tail. The dust produces a separate, curving tail. It's these processes that Rosetta scientists hope to be able to study from close proximity.

Taylor explained that the survey will show the team what the comet nucleus looks like now and when it gets closer to the sun.

"We'll be able to make a comparison to now, when its relatively inert, to when it's highly active ... making this measurement over a year when we're riding alongside at walking pace and observing how a comet works and interacts with the sun," he said.

"We are there for over a year to see this compete development to the extent that you may even be able to measure the decrease in the volume of the nucleus ... see how much material has left the comet."

Rosetta's target comet 67P/Churyumov-Gerasimenko is known as a short-period comet. It reappears every six years as its orbit brings it close to the sun. Halley's comet has a period of about 76 years and is not due to return close enough to Earth to be visible until 2061. Others only return after thousands of years.

Matt Taylor says it is unlikely that you will be able to see comet 67P with the naked eye but you can follow the progress of the mission on Rosetta's blog and find out more with CNN's interactive coverage.