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In the coming years‚ NASA plans to send several astrobiology missions to Venus and Mars to search for evidence of extraterrestrial life. These will occur alongside crewed missions to the Moon (for the first time since the Apollo Era) and the first crewed missions to Mars. Beyond the inner Solar System‚ there are ambitious plans to send robotic missions to Europa‚ Titan‚ and other “Ocean Worlds” that could host exotic life. To accomplish these objectives‚ NASA is investing in some interesting new technologies through the NASA Innovative Advanced Concepts (NIAC) program. This year’s selection includes solar-powered aircraft‚ bioreactors‚ lightsails‚ hibernation technology‚ astrobiology experiments‚ and nuclear propulsion technology. This includes a concept for a Thin Film Isotope Nuclear Engine Rocket (TFINER)‚ a proposal by senior technical staff member James Bickford and his colleagues at the Charles Stark Draper Laboratory – a Massachusetts-based independent technology developer. This proposal relies on the decay of radioactive isotopes to generate propulsion and was recently selected by the NIAC for Phase I development. As their proposal paper indicates‚ advanced propulsion is essential to realizing several next-generation mission concepts. These include sending a telescope to the focal point of the Sun’s gravitational lens and a rendezvous with a passing interstellar object. These mission concepts require rapid velocities that are simply not possible with conventional rocketry. While lightsails are being investigated for rapid-transit missions within the Solar System and Proxima Centauri‚ they cannot make the necessary propulsive maneuvers in deep space. A collage of illustrations highlighting the novel concepts proposed by the 2024 NIAC Phase I awardees. Credit: (clockwise‚ from upper right) Benner/Zhang/McQuinn/Romero-Calvo/Hibberd-Kennedy/Carpenter/Bickford/Romero/Calvo/Cabauy/Landis/Rothschild/Ge-Cheng Zha/NASA Nuclear concepts that are possible with current technology include nuclear-thermal and nuclear-electric propulsion (NTP/NEP)‚ which have the necessary thrust to reach locations in deep space. However‚ as Bickford and his team noted‚ they are also large‚ heavy‚ and expensive to manufacture. “In contrast‚ we propose a thin film nuclear isotope engine with sufficient capability to search‚ rendezvous‚ and then return samples from distant and rapidly moving interstellar objects.” they write. “The same technology allows a gravitational lens telescope to be repointed so a single mission could observe numerous high-value targets.” The basic concept is similar to a solar sail‚ except that it relies on thin sheets of a radioactive isotope that uses the momentum of its decay products to generate thrust. As they describe it‚ the baseline design incorporates sheets of the Thorium-228 measuring about ~10 micrometers (0.01 mm) thick. This naturally radioactive metal (typically used in radiation therapy) undergoes alpha decay with a half-life of 1.9 years. Thrust is produced by coating one side with a ~50-micrometer (0.05 mm) thick absorber layer‚ forcing alpha particles in the direction opposite of travel. The spacecraft would require 30 kg (66 lbs) of Thorium-228 spread over an area measuring over 250 m2 (~2700 square feet)‚ providing more than 150 km/s (93 mi/s) of thrust. For comparison‚ the fastest mission that relied on conventional propulsion was the Parker Solar Probe (PSP)‚ which achieved a velocity of 163 km/s (101 mi/s) as it reached the closest point in its orbit around the Sun (perihelion). However‚ this was because of the gravity-assist maneuver with Venus and the pull of the Sun’s gravity. The advantages of this system include simplicity‚ as the design is based on known physics and materials. It also offers scalability to accommodate smaller payloads (like sensors) or larger missions (like space telescopes). A single conventional launch vehicle could insert several of these spacecraft into a solar escape trajectory‚ requiring an escape velocity of 42.1 km/s (26 mi/s). The thrust sheets can also be reconfigured to enable thrust vectoring and spacecraft maneuvers‚ meaning that the spacecraft could scout for future missions once it reaches deep space. A plutonium-238 ceramic pellet glowing red hot. Credit: Los Alamos Laboratory This includes telescopes bound for the Solar Gravitational Lens’ (SGL) focal point and missions that will rendezvous with interstellar objects (ISOs) and possibly return samples to Earth for analysis. Speaking of which‚ the spacecraft would have the spare capacity to rendezvous with an ISO on its own and return samples. The natural decay of the sheets can also be harnessed using a layer of thermoelectric materials (or Peltier Tiles) to generate excess electrical power of about 50 kW at 1% efficiency. A layer of beta-particle emitting material could also be added to neutralize the alpha radiation and “induce a voltage bias that directs exhaust emissions and/or exploits outbound solar wind.” They also note how the concept can be designed with multiple “stages” equipped with Actinium-227 (or other isotopes with a longer half-life)‚ leading to higher velocity over extended mission lifetimes. Similarly‚ a modified version that relies on Thorium-233 can harness the Thorium fuel cycle – a cascading isotope decay that eventually produces Uranium-232 – that will result (they claim) in an increased performance of about 500%. Clearly‚ the proposed technology presents many opportunities for future development and could be used to execute several mission profiles. These missions align with NASA’s vision for the coming century‚ which includes sending spacecraft to study ISOs up close‚ discover habitable planets in neighboring star systems‚ conduct crewed missions beyond the Earth-Moon system‚ and search for life on other celestial bodies. Further Reading: NASA The post NASA Invests in New Nuclear Rocket Concept for the Future of Space Exploration and Astrophysics appeared first on Universe Today.

It seems crazy that Uranus was discovered in 1781 yet here we are‚ in 2024 and we have only sent one spacecraft to explore Uranus. Voyager 2 is the only spacecraft to have given us close-up images of Uranus (and Neptune) but since their visit in 1986‚ we have not returned. There have of course been great images from the Hubble Space Telescope and from the James Webb Space Telescope but we still have lots to learn about them.  The discovery of Uranus was accidental! British astronomer William Herschel was surveying stars that were too faint to see with the naked eye. One star caught his attention as it seemed to move agasinst the fixed background of stars. He assumed therefore that it was closer than the more distant‚ background stars. Initially he thought it was a comet but it was soon realised that it was a new planet. It was Uranus Our knowledge of Uranus was quite limited until the advent of space exploration‚ in particular the Voyager spacecraft. Voyager 2 was launched on 20 August 1977 via the Titan Centaur rocket. Following flybys of Jupiter and Saturn in 1979 and 1981 respectively‚ it visited Uranus in 1986.  Voyager 2 revealed a world with a lack of internal heat‚ a warmer than expected thermosphere and a magnetic field offset from the planets rotational axis. Other than that‚ Uranus has been sitting quitely minding its own business‚ being observed from afar through our best space telescopes.  This artist’s concept depicts one of NASA’s Voyager spacecraft‚ including its high-gain antenna. Voyager 2 is out of communications until October. Credit: NASA/JPL-Caltech There are however‚ many questions and uncertainties around the seventh planet from the Sun; from the nature of its interior and the interactions with the magnetic field to the mechanisms that shape the planet we see today. Without a doubt‚ a dedicated Uranian mission would help to unravel some of these mysteries.  It’s not just the paper that has been recently published by Emma K Dahl and team that recommends a Uranus Orbiter and Probe but a survey compiled by the National Academies of Sciences‚ Egineering and Medicine (NASEM) also found the same conclusion. A mission that could monitor Uranus over the long term would be invaluable in unlocking more details about the atmosphere; how the planet formed and how it has migrated around the Solar System? how the atmosphere has contributed to the evolution of the planet?; what processes are underway in the Uranian atmosphere and much more.  Uranus as seen by NASA’s Voyager 2. Credit: NASA/JPL Unlocking some of these mysteries will not only help us to understand the nature or Uranus but also help us to understand how the Solar System and other planetary systems form. The paper goes further though‚ not just discussing the key outstanding questions but also looking at the measurements needed to derive conclusions and hypotheses from temperature and pressure profiles‚ chemical concentrations‚ wind speeds‚ vertical convection levels and magnetic field strengths to name a few.  There is a huge level of support across the science community for a mission to Uranus and not just an orbiter‚ a probe that can offer long term readings and observations. The recommendations from the NASEM review highlight the areas of focus and‚ if addressed‚ will help to finally unravel some of the mysteries of Uranus.  Source : Atmospheric Science Questions for a Uranian Probe The post It’s Time to Go Back to Uranus. What Questions do Scientists Have About the Ice Giants? appeared first on Universe Today.

There is hope!

A bad habit‚ or a valuable time capsule?

A time capsule from the birth of the Solar System.

Fun fact 'The Shawshank Redemption' was trampled on by 'Forest Gump' in 1995‚ find out the other biggest snubs in Oscar history!

Citizens have a God given right to protect their land! Alex Jones lays out how the U.S. Founding Fathers provided We The People with a gameplan on how to defend our borders.

This is what the ruling class thinks of the average person Alex Jones presents video footage of WEF minion Yuval Noah Harari denying the existence of God‚ freedom‚ human rights‚ nations‚ and borders‚ saying that they have been invented by the human imagination.