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After Cassini: 14 Epic Planetary Science Missions to Get Excited About



An artistic representation of the Mars2020 rover (operating the SuperCam remote sensing instrument) on the Red Planet.

NASA’s Cassini spacecraft ended its epic 13-year stint at Saturn on Sept. 15, but there are other upcoming planetary science missions to look forward to.

Currently, there are several active missions (led by NASA as well as other space agencies) exploring planets and other rocky objects in the solar system. For example, the Juno probe is studying Jupiter, and the Curiosity rover is exploring Mars. Looking ahead, NASA is reviewing mission proposals that may include returning to Saturn to search for signs of life on ocean worlds, like the planet’s moons Enceladus and Titan. Planned missions to Mars, Mercury, Jupiter and other celestial bodies in our solar system and beyond are also in the works.

Here’s a list of some of the orbiters, probes and rovers en route to new destinations or slated to launch in the next few years. [In Photos: Cassini Mission Ends with Epic Dive into Saturn]

NASA’s Mars 2020 rover will search for signs of past microbial life and possibly habitable conditions that may have once existed on the Red Planet. The rover’s basic design resembles that of NASA’s nuclear-powered Curiosity rover. The Mars 2020 rover will use a drill to collect core samples of rocks and soils, and then examine those samples on a microscopic level to search for biosignatures, or chemicals that could be indicative of ancient life on the Red Planet. (The Mars 2020 drill will probe much deeper into the Martian surface than the drill on Curiosity.) Samples collected by the Mars 2020 rover could potentially be returned to Earth in a future mission.

The rover is expected to launch in July or August of 2020 aboard a United Launch Alliance Atlas V rocket. Three potential landing sites have been selected and include an ancient lake bed called the Jezero crater, the edge of the Syrtis Major volcanoes and a hot-spring site called Columbia Hills. Mission scientists hope that, after it touches down on the Red Planet, the rover will explore the Martian surface for two years. This mission offers a unique opportunity to prepare for future human exploration of Mars, mission team members have said.

NASA’s InSight Mars lander is expected to launch in May 2018 and arrive at the Red Planet in November 2018. The Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) mission will study the planet’s deep interior to gain a better understanding of the processes that helped shaped rocky planets like Mars and Earth.

Once it has landed on the Red Planet, the probe will spend a full Mars year (687 Earth days) surveying its surroundings. (Because it’s not a rover, it will have to stay in one spot.) InSight will be equipped with two specialized instruments, allowing it to probe deep beneath the Martian surface and study the planet’s internal geologic activity and temperature.

The European Space Agency (ESA) also has its eye on the Red Planet. The ExoMars rover mission is designed to search for signs of ancient life that may have once existed on Mars. The golf-cart-size rover will be equipped with a drill to collect samples, as well as a panoramic camera system for stereoscopic imaging and ground-penetrating radar to search for ice beneath the Martian surface.

The ExoMars rover is scheduled to launch in the spring of 2020. The rover will reach the Red Planet in 2021, joining the ExoMars Trace Gas Orbiter — the first phase of the ExoMars mission, which launched toward the Red Planet on March 14, 2016.

This artist’s rendering shows NASA’s Europa Clipper spacecraft, which is being developed for a launch sometime in the 2020s and will explore Jupiter’s icy moon.

Credit: NASA/JPL-Caltech

NASA’s Europa Clipper mission will study the possibly habitable Jovian moon Europa. The probe is expected to launch in 2022 and later settle into orbit around Jupiter in 2025. The solar-powered spacecraft will perform about 40 flybys of Europa to learn more about the ocean of liquid water that lies beneath the moon’s icy crust and perhaps determine if it is capable of supporting life as we know it on Earth.

ESA is also planning a mission to Jupiter in 2022. However, the Jupiter Icy Moons Explorer, also known as JUICE, won’t arrive at the Jovian giant until 2029. JUICE will study Jupiter’s atmosphere and magnetic environment, and it will also investigate three of the planet’s Galilean moons: Europa, Callisto and Ganymede.

ESA and the Japanese Aerospace Exploration Agency (JAXA) plan to launch a joint mission to Mercury in October 2018. The mission includes a carrier spacecraft called the Mercury Transfer Module (MTM) — which supplies electrical power during interplanetary cruising — and two separate orbiters: Europe’s Mercury Planet Orbiter and Japan’s Mercury Magnetospheric Orbiter.

The spacecraft will take about seven years to get into orbit around Mercury, using several gravity assists from Earth and Venus. The mission is designed to investigate how Mercury formed so close to a parent star, and to take a closer look at the planet’s interior structure, geology, composition and magnetic field.

This artist's rendering show the Parke Solar Probe, which will fly closer to the sun than any previous spacecraft.

This artist’s rendering show the Parke Solar Probe, which will fly closer to the sun than any previous spacecraft.

Credit: Johns Hopkins University Applied Physics Laboratory

NASA’s Parker Solar Probe, which is scheduled to launch on July 31, 2018, will travel closer to the sun than any spacecraft in history. The mission will perform 24 close flybys of the sun — some of which will bring the spacecraft within just 3.9 million miles (6.2 million kilometers) of the solar surface.

From this unique vantage point, the probe will be able to measure the sun’s electric and magnetic fields, photograph the solar structure and study the solar wind. These findings could help astronomers answer questions about the sun’s perplexing outer atmosphere, also known as the corona, and other long-standing mysteries.

China is planning to launch a sample-return mission to the moon at the end of November 2017. The mission, called Chang’e 5, will be the first to return lunar material to Earth in more than 40 years. The spacecraft will include an orbiter, a lander, an ascender and an Earth re-entry module. Chang’e 5 is one in a series of China’s moon exploration missions, which also include Chang’e 4 — a lunar probe set to launch around 2018 and make the first-ever soft landing on the farside of the moon.

The Google Lunar X Prize is an international challenge to land a robot on the lunar surface, have it travel at least 1,650 feet (500 meters), and send high-definition photos and videos back to Earth. There are five teams still competing for the $30 million prize: Florida-based Moon Express, Israel’s SpaceIL, Japan’s Hakuto, India-based TeamIndus and the international collaboration Synergy Moon. To qualify for the Lunar X Prize, teams must complete their lunar missions by March 31, 2018.

This artist's concept shows the Origins Spectral Interpretation Resource Identification Security - Regolith Explorer (OSIRIS-REx) spacecraft grabbing a sample of an asteroid for return to Earth.

This artist’s concept shows the Origins Spectral Interpretation Resource Identification Security – Regolith Explorer (OSIRIS-REx) spacecraft grabbing a sample of an asteroid for return to Earth.

Credit: NASA’s Goddard Space Flight Center

NASA’s OSIRIS-REx (short for Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer) mission will study the near-Earth asteroid Bennu. The mission launched on Sept. 8, 2016, and is slated to arrive at Bennu in 2018.

OSIRIS-REx will spend approximately two years studying the rocky body in great detail, before collecting a sample to bring home to Earth. Asteroids are leftovers from the formation of planets and carry blueprints of the early solar system. Samples collected from Bennu will therefore help astronomers learn more about the evolution of our solar system and how planets formed. If all goes according to plan, OSIRIS-REx will return to Earth in 2023, marking the first U.S. asteroid sample-return mission.

JAXA’s Hayabusa2 mission is another asteroid-sampling mission en route to its target destination. The spacecraft launched on Dec. 2, 2014, and is expected to arrive at asteroid 162173 Ryugu in 2018. Hayabusa2 follows JAXA’s historic 2003 Hayabusa mission, which brought the first pristine samples of an asteroid to Earth in 2010.

This time around, the mission will land a small probe on the surface of the asteroid, as well as a pair of rovers for exploring the asteroid’s surface. Hayabusa2 will spend a year studying the asteroid before collecting samples to return to Earth in December 2020.

NASA’s Psyche mission will launch in 2022 to study a bizarre metal asteroid up close. The asteroid, called 16 Psyche, is located in the belt between Mars and Jupiter. Whereas most asteroids are made of rock, Psyche is composed of metallic iron and nickel — the same material found in Earth’s core. It’s the only known object of its kind in the solar system, leading astronomers to believe that the asteroid is the remnant of what was once a protoplanet in the early solar system. Therefore, learning more about this asteroid will help scientists better understand the cores of Earth, Mars, Mercury and Venus.

NASA’s New Horizons probe visited Pluto in July 2015, completing a nearly decade-long journey to the distant dwarf planet. The mission provided the first-ever up-close view of Pluto, revealing new details about its icy surface and largest moon, Charon.

Since accomplishing this amazing feat, the probe is still going strong and is set on a new object deeper in the Kuiper Belt, located approximately 1 billion miles (1.6 billion km) beyond Pluto. On Jan. 1, 2019, the spacecraft will fly within just 2,175 miles (3,500 kilometers) of the distant object called 2014 MU69, allowing the probe to study the rocky body up close. This ancient object is also expected to help paint a clearer picture of what the early solar system was like.

This artist's concept depicts NASA's Voyager 1 spacecraft entering interstellar space in 2012. The probe and its twin, Voyager 2, are still in contact with Earth.

This artist’s concept depicts NASA’s Voyager 1 spacecraft entering interstellar space in 2012. The probe and its twin, Voyager 2, are still in contact with Earth.

Credit: NASA/JPL-Caltech

This year, NASA’s historic Voyager mission celebrated 40 years in space, and it’s not ready to quit anytime soon. The twin spacecraft launched two weeks apart in 1977 — Voyager 2 on Aug. 20 and Voyager 1 on Sept. 5 — with an initial goal to study the planets and explore the outer solar system.

Over the course of the mission, the Voyager probes have captured up-close views of Jupiter, Saturn, Uranus, Neptune and many of the moons of these giant planets. In August 2012, Voyager 1 became the first spacecraft ever to reach interstellar space, and Voyager 2 is currently flying through the bubble of solar material that marks the boundary between the solar system and interstellar space.

Follow Samantha Mathewson @Sam_Ashley13. Follow us @Spacedotcom, Facebook and Google+. Original article on is the premier source of space exploration, innovation and astronomy news, chronicling (and celebrating) humanity's ongoing expansion across the final frontier. We transport our visitors across the solar system and beyond through accessible, comprehensive coverage of the latest news and discoveries. For us, exploring space is as much about the journey as it is the destination. So from skywatching guides and stunning photos of the night sky to rocket launches and breaking news of robotic probes visiting other planets, at you’ll find something amazing every day.



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Mars Meteorite Will Return to the Red Planet with NASA Rover



Rohit Bhartia of NASA’s Mars 2020 mission holds a slice of a meteorite scientists have determined came from Mars. This slice will likely be used here on Earth for testing a laser instrument for NASA’s Mars 2020 rover; a separate slice will go to Mars on the rover.

A chunk of rock that was once part of Mars, but landed on Earth as a meteorite, will return to the Red Planet aboard a NASA rover set to launch in 2020

The meteorite, known as Sayh al Uhaymir 008 (SaU008) was found in Oman in 1999, but geologists determined that it likely originated on Mars, according to a statement from NASA’s Jet Propulsion Laboratory. Scientists think collisions between Mars and other large bodies in the solar system’s early days sent chunks of the Red Planet into space, where they might wander for eons before falling onto Earth’s surface.  

Now, NASA scientists are using the meteorite to calibrate an instrument that will fly on the Mars 2020 rover, which is scheduled to drop down on the Red Planet’s surface and collect rock samples that could one day be returned to Earth. One of the rover’s main goals is to evaluate the potential habitability of ancient and present-day Mars. [How NASA’s Mars 2020 Rover Will Work (Infographic)]

The meteorite is being used to calibrate an instrument called the SHERLOC (Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals), which will use techniques often used in forensic science to identify chemicals in the Martian rock samples, in features as thin as a human hair.

A close-up of a meteorite that likely came from Mars.

A close-up of a meteorite that likely came from Mars.

Credit: NASA/JPL-Caltech

The researchers will study the meteorite on Earth, where they are able to make sure their instruments are producing a correct analysis of the rock, and understand what features of the rock are perceptible to their instruments. When the rover settles onto Mars, researchers can once again use the rock to make sure their instruments are working as they should be, before pointing them at features of the Martian surface. 

“We’re studying things on such a fine scale that slight misalignments, caused by changes in temperature or even the rover settling into sand, can require us to correct our aim,” said Luther Beegle, principal investigator for SHERLOC, in the statement. “By studying how the instrument sees a fixed target, we can understand how it will see a piece of the Martian surface.”

There are only about 200 confirmed Martian meteorites that have been found on Earth, according to the statement. The SaU008 meteorite comes from London’s Natural History Museum, which lends out hundreds of meteorites (most of them not from Mars) every year for scientific studies. The SHERLOC team needed a Martian meteorite that was robust enough to endure the journey to Mars without flaking or crumbling. (Launch from Earth and entry into the Martian atmosphere are both very strenuous events for everything on board.) The rock also “needed to possess certain chemical features to test SHERLOC’s sensitivity. These had to be reasonably easy to detect repeatedly for the calibration target to be useful,” according to the statement.  

A slice of a Martian meteorite undergoes oxygen cleaning to remove organics. This slice will remain on Earth to be used for testing and calibrating instruments.

A slice of a Martian meteorite undergoes oxygen cleaning to remove organics. This slice will remain on Earth to be used for testing and calibrating instruments.

Credit: NASA/JPL-Caltech

Usually, instruments like SHERLOC are calibrated with a variety of materials including rock, metal and glass. And Mars meteorites have been used for instrument calibration in the past. In fact, another instrument aboard the Mars 2020 rover, called SuperCam, will be adding a Mars meteorite to NASA’s calibration target, according to the statement. And while this would be the first Mars meteorite to return to the surface of the Red Planet, NASA’s Mars Global Surveyor, which orbits the Red Planet, carries a chunk of a Martian meteorite.

SHERLOC will carry other materials from Earth in addition to Su008, including materials that could be used to make a spacesuit for use on Mars. Observations of how the material withstands the radiation, atmosphere and temperature variations on Mars will provide valuable information for possible crewed trips to the Red Planet.  

“The SHERLOC instrument is a valuable opportunity to prepare for human spaceflight as well as to perform fundamental scientific investigations of the Martian surface,” Marc Fries, a SHERLOC co-investigator and curator of extraterrestrial materials at Johnson Space Center, said in the statement. “It gives us a convenient way to test material that will keep future astronauts safe when they get to Mars.”

Follow Calla Cofield @callacofield. Follow us @Spacedotcom, Facebook and Google+. Original article on

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Kepler Space Telescope Discovers 95 More Alien Planets



Planets around other stars are the rule rather than the exception, and there are likely hundreds of billions of exoplanets in the Milky Way alone. NASA’s Kepler space telescope has found more than 2,400 alien worlds, including a new haul of 95 planets announced on Feb. 15, 2018.

The exoplanet discoveries by NASA’s Kepler space telescope keep rolling in.

Astronomers poring through data gathered during Kepler’s current extended mission, known as K2, have spotted 95 more alien planets, a new study reports. 

That brings the K2 tally to 292, and the total haul over Kepler’s entire operational life to nearly 2,440 — about two-thirds of all the alien worlds ever discovered. And more than 2,000 additional Kepler candidates await confirmation by follow-up observations or analysis. [7 Greatest Exoplanet Discoveries by NASA’s Kepler (So Far)]

Kepler launched in March 2009, on a mission to help scientists determine just how common rocky, potentially habitable worlds such as Earth are throughout the Milky Way. For four years, the spacecraft stared continuously at about 150,000 stars, looking for tiny dips in their brightness caused by the passage of planets across their faces.

This work was highly productive, as noted above. But in May 2013, the second of Kepler’s four orientation-maintaining “reaction wheels” failed, and the spacecraft lost its superprecise pointing ability, bringing the original mission to a close.

But mission managers figured out a way to stabilize Kepler using sunlight pressure, and the spacecraft soon embarked on its K2 mission, which involves exoplanet hunting on a more limited basis, as well as observing comets and asteroids in our own solar system, supernovas and a range of other objects and phenomena.

For the new study, researchers analyzed K2 data going all the way back to 2014, zeroing in on 275 “candidate” signals.

“We found that some of the signals were caused by multiple star systems or noise from the spacecraft,” study lead author Andrew Mayo, a Ph.D. student at the Technical University of Denmark’s National Space Institute, said in a statement. “But we also detected planets that range from sub-Earth-sized to the size of Jupiter and larger.”

Indeed, 149 of the signals turned out to be caused by bona fide exoplanets, 95 of which are new discoveries. And one of the new ones is a record setter.

“We validated a planet on a 10-day orbit around a star called HD 212657, which is now the brightest star found by either the Kepler or K2 missions to host a validated planet,” Mayo said. “Planets around bright stars are important because astronomers can learn a lot about them from ground-based observatories.”

The new study was published today (Feb. 15) in The Astronomical Journal.

Follow Mike Wall on Twitter @michaeldwall and Google+. Follow us @Spacedotcom, Facebook or Google+. Originally published on

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Russian Cargo Ship Delivers 3 Tons of Supplies to Space Station



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