Feb 22 2017
From The Space Library
RELEASE 17-015 NASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star
NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.
The discovery sets a new record for greatest number of habitable-zone planets found around a single star outside our solar system. All of these seven planets could have liquid water – key to life as we know it – under the right atmospheric conditions, but the chances are highest with the three in the habitable zone.
“This discovery could be a significant piece in the puzzle of finding habitable environments, places that are conducive to life,” said Thomas Zurbuchen, associate administrator of the agency’s Science Mission Directorate in Washington. “Answering the question ‘are we alone’ is a top science priority and finding so many planets like these for the first time in the habitable zone is a remarkable step forward toward that goal.”
At about 40 light-years (235 trillion miles) from Earth, the system of planets is relatively close to us, in the constellation Aquarius. Because they are located outside of our solar system, these planets are scientifically known as exoplanets.
This exoplanet system is called TRAPPIST-1, named for The Transiting Planets and Planetesimals Small Telescope (TRAPPIST) in Chile. In May 2016, researchers using TRAPPIST announced they had discovered three planets in the system. Assisted by several ground-based telescopes, including the European Southern Observatory's Very Large Telescope, Spitzer confirmed the existence of two of these planets and discovered five additional ones, increasing the number of known planets in the system to seven.
The new results were published Wednesday in the journal Nature, and announced at a news briefing at NASA Headquarters in Washington.
Using Spitzer data, the team precisely measured the sizes of the seven planets and developed first estimates of the masses of six of them, allowing their density to be estimated.
Based on their densities, all of the TRAPPIST-1 planets are likely to be rocky. Further observations will not only help determine whether they are rich in water, but also possibly reveal whether any could have liquid water on their surfaces. The mass of the seventh and farthest exoplanet has not yet been estimated – scientists believe it could be an icy, "snowball-like" world, but further observations are needed.
"The seven wonders of TRAPPIST-1 are the first Earth-size planets that have been found orbiting this kind of star," said Michael Gillon, lead author of the paper and the principal investigator of the TRAPPIST exoplanet survey at the University of Liege, Belgium. "It is also the best target yet for studying the atmospheres of potentially habitable, Earth-size worlds."
In contrast to our sun, the TRAPPIST-1 star – classified as an ultra-cool dwarf – is so cool that liquid water could survive on planets orbiting very close to it, closer than is possible on planets in our solar system. All seven of the TRAPPIST-1 planetary orbits are closer to their host star than Mercury is to our sun. The planets also are very close to each other. If a person was standing on one of the planet’s surface, they could gaze up and potentially see geological features or clouds of neighboring worlds, which would sometimes appear larger than the moon in Earth's sky.
The planets may also be tidally locked to their star, which means the same side of the planet is always facing the star, therefore each side is either perpetual day or night. This could mean they have weather patterns totally unlike those on Earth, such as strong winds blowing from the day side to the night side, and extreme temperature changes.
Spitzer, an infrared telescope that trails Earth as it orbits the sun, was well-suited for studying TRAPPIST-1 because the star glows brightest in infrared light, whose wavelengths are longer than the eye can see. In the fall of 2016, Spitzer observed TRAPPIST-1 nearly continuously for 500 hours. Spitzer is uniquely positioned in its orbit to observe enough crossing – transits – of the planets in front of the host star to reveal the complex architecture of the system. Engineers optimized Spitzer’s ability to observe transiting planets during Spitzer’s “warm mission,” which began after the spacecraft’s coolant ran out as planned after the first five years of operations.
"This is the most exciting result I have seen in the 14 years of Spitzer operations," said Sean Carey, manager of NASA's Spitzer Science Center at Caltech/IPAC in Pasadena, California. "Spitzer will follow up in the fall to further refine our understanding of these planets so that the James Webb Space Telescope can follow up. More observations of the system are sure to reveal more secrets.”
Following up on the Spitzer discovery, NASA's Hubble Space Telescope has initiated the screening of four of the planets, including the three inside the habitable zone. These observations aim at assessing the presence of puffy, hydrogen-dominated atmospheres, typical for gaseous worlds like Neptune, around these planets.
In May 2016, the Hubble team observed the two innermost planets, and found no evidence for such puffy atmospheres. This strengthened the case that the planets closest to the star are rocky in nature.
"The TRAPPIST-1 system provides one of the best opportunities in the next decade to study the atmospheres around Earth-size planets," said Nikole Lewis, co-leader of the Hubble study and astronomer at the Space Telescope Science Institute in Baltimore, Maryland. NASA's planet-hunting Kepler space telescope also is studying the TRAPPIST-1 system, making measurements of the star's minuscule changes in brightness due to transiting planets. Operating as the K2 mission, the spacecraft's observations will allow astronomers to refine the properties of the known planets, as well as search for additional planets in the system. The K2 observations conclude in early March and will be made available on the public archive.
Spitzer, Hubble, and Kepler will help astronomers plan for follow-up studies using NASA's upcoming James Webb Space Telescope, launching in 2018. With much greater sensitivity, Webb will be able to detect the chemical fingerprints of water, methane, oxygen, ozone, and other components of a planet's atmosphere. Webb also will analyze planets' temperatures and surface pressures – key factors in assessing their habitability.
NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, manages the Spitzer Space Telescope mission for NASA's Science Mission Directorate. Science operations are conducted at the Spitzer Science Center, at Caltech, in Pasadena, California. Spacecraft operations are based at Lockheed Martin Space Systems Company, Littleton, Colorado. Data are archived at the Infrared Science Archive housed at Caltech/IPAC. Caltech manages JPL for NASA.
RELEASE 17-020 NASA Establishes New Public-Private Partnerships to Advance U.S. Commercial Space Capabilities
NASA is partnering with eight U.S. companies to advance small spacecraft and launch vehicle technologies that are on the verge of maturation and are likely to benefit both NASA and the commercial space market.
These partnerships are the result of a solicitation released in August 2016 by NASA’s Space Technology Mission Directorate (STMD), titled Utilizing Public-Private Partnerships to Advance Tipping Point Technologies. They mark the second round of public-private opportunities that enable industry to develop promising commercial space technologies that also may benefit future NASA missions.
"The first awards showed us how much the commercial space sector is ready to collaborate with us on developing capabilities that align with their business plans and meet NASA's strategic goals," said Steve Jurczyk, associate administrator for STMD. "By contributing their own funds to their projects, these U.S. companies are joining in innovative co-investments to enable NASA's next generation of science and human exploration missions."
A technology is considered at a ‘tipping point’ if an investment in a demonstration of its capabilities will result in a significant advancement of the technology's maturation, a higher likelihood of infusion into a commercial space application, and a significant improvement in the partner’s ability to successfully bring the technology to market.
Small Launch Vehicle Technology Development
Small Launch Vehicle Technology enables the use of small spacecraft for technology development, science missions and to support deep space human exploration. The agency is partnering with the following companies to accelerate the development of commercial capabilities to enable frequent launches of small spacecraft to low-Earth orbit:
Masten Space Systems, Inc., Mojave, California Maturing the M10A 25,000lbf Liquid Oxygen/Methane Broadsword Engine
Masten Space Systems is developing an engine which incorporates advanced manufacturing techniques. The engine will be used to provide a lower-cost reusable launch service for the growing CubeSat and smallsat launch market.
Ventions, LLC, San Francisco Development and Flight-Testing of a High-Performance Electric-Pump Fed Launch Vehicle
Ventions LLC will provide a full launch vehicle integration and orbital flight test demonstration of a two-stage launch vehicle. The launch vehicle will be capable of on-demand ground launch of small payloads to low-Earth orbit.
Tyvak Nano-Satellite Systems, Inc., Irvine, California Micro-Avionics Multi-Purpose Platform (MicroAMPP)
Tyvak will produce a commercial micro-avionics platform which supports launch vehicles and microsatellites. The project also will create a real-time system capable of simulating launch scenarios. Three test flights will be conducted to demonstrate the micro-avionics platform.
HRL Laboratories, LLC, Malibu, California Additively Manufactured Ceramic Rocket Engine Components
HRL Laboratories will develop additively manufactured high-temperature materials applicable to rocket engine components. HRL Laboratories, working with their sub-contractor Vector Space Systems, will mature the technology resulting in a hot-fire test of a high performance liquid oxygen/propylene rocket engine. This technology can be applied to small and large engines for launch vehicles.
UP Aerospace, Inc., Littleton, Colorado Spyder: Critical Technology Demonstration Tests
A suborbital mission will demonstrate several subsystems for a launch vehicle currently under development. The subsystems include a Guidance, Navigation & Control (GN&C) system, nose-fairing separation system, and lightweight staging system. In addition, a ground test will be conducted for the Stage 1 rocket engine. The launch vehicle will be capable of launching small nanosatellites to low-Earth orbit.
Orbital Sciences Corporation, Dulles, Virginia
Carbon Nanotube Infused Launch Vehicle Structures
Orbital Sciences Corporation will incorporate advanced materials for dampening into flight structures to reduce dynamic loads during flight. They will build sub-scale and full-scale flight structures and complete end-to-end ground and flight testing. If successful, this technology has the potential to increase the payload capability and reduce costs for launch vehicles.
Small Spacecraft Capability Demonstration Missions
NASA is partnering with the following companies to advance small spacecraft capabilities through flight demonstrations with aggressive schedule and cost targets:
Trans Astronautica Corporation, Lake View Terrace, California Theia: Synthetic Tracking Demonstration for Commercial, NASA and Other Government Agency Applications to Space Situational Awareness, Planetary Defense, and Asteroid In Situ Resource Utilization
Addressing a potential need for increased space situational awareness, this orbital demonstration mission will seek to detect near-Earth asteroids and orbital debris through a new technique that helps detect small, fast-moving objects that are dimly lit. Working with Deep Space Industries of Moffett Field, California, and NASA’s Jet Propulsion Laboratory in Pasadena, California, Trans Astronautica will test a synthetic tracking system that detects objects streaking though its field of view and then, working in a way analogous to HDR imagery, builds a composite image of the object.
ExoTerra Resource, Littleton, Colorado 300-Watt CubeSat Solar Electric Propulsion Demonstrator
Opportunities to launch as secondary payloads offer an affordable way to get small spacecraft into orbit, but safety restrictions on launching with energetic and pressurized materials often prevents those spacecraft from carrying significant propulsion capabilities. ExoTerra will flight test a 300-watt solar electric propulsion system that uses iodine in place of xenon gas. Iodine can be launched as an inert solid and then vaporized into an ionized gas once in orbit, which removes the risk to the launch vehicle. Launching as a dense solid instead of a gas also increases the amount of propellant that can be stored in the same volume on the spacecraft. ExoTerra’s demonstration mission will attempt a flyby of a near-Earth asteroid with an instrumentation payload provided by Deep Space Industries of Moffett Field, California.
These fixed-priced contracts include milestone payments tied to technical progress and require a minimum 25 percent industry contribution, though all awards are contingent on the availability of appropriated funding. The contracts are worth a combined total of approximately $17 million, and each have an approximate two-year performance period culminating in a small spacecraft orbital demonstration mission or the maturation of small launch vehicle technologies.
These awards are funded by STMD, which is responsible for developing the cross-cutting, pioneering, new technologies and capabilities needed by the agency to achieve its current and future missions.
