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Mars Was Warm Enough To Sustain Life A Few Billion Years Ago, Claim Astronomers @ 2019-08-24T12: 返回 熱門新聞
關鍵詞:on Mars may have
概念:
IT IS NOT NEW INFORMATION THAT MARS WAS ONCE HOME TO AN ABUNDANCE OF WATER. BUT IT HAS REMAINED SOMEWHAT OF A MYSTERY WHETHER THE WATER ON MARS WAS MOSTLY LIQUID OR FROZEN AS ICE, AND HOW THIS MAY HAVE CHANGED OVER TIME. WARMER TEMPERATURES ON MARS WOULD NOT ONLY SIGNIFY THE PRESENCE OF LIQUID WATER, WARMER CONDITIONS ALSO MAKE IT MORE LIKELY THAT LIFE COULD HAVE FORMED INDEPENDENTLY ON THE PLANET.
"WE KNOW THAT THE BUILDING BLOCKS OF LIFE ON EARTH DEVELOPED VERY SOON AFTER THE EARTH"S FORMATION, AND THAT FLOWING WATER IS ESSENTIAL FOR LIFE"S DEVELOPMENT," HORGAN SAID. "SO EVIDENCE THAT WE HAD EARLY, FLOWING WATER ON MARS, WILL INCREASE THE CHANCES THAT SIMPLE LIFE MAY HAVE DEVELOPED AT AROUND THE SAME TIME AS IT DID ON EARTH. WE HOPE THAT THE MARS 2020 MISSION WILL BE ABLE TO LOOK MORE CLOSELY AT THESE MINERALS, AND BEGIN TO ANSWER EXACTLY WHAT CONDITIONS EXISTED WHEN MARS WAS STILL YOUNG".
NO MATTER WHAT ELON MUSK"S PLANS MAY BE. FORTUNATELY WE CAN, SORT OF, VISIT MARS HERE ON EARTH -- AS LONG AS WE CAN GET TO NORTHERN CHILE. IN THAT PART OF THE PLANET, THE VERY MARS-LIKE ATACAMA DESERT RESIDES. AS ONE OF THE DRIEST, DUSTIEST PLACES IN THE WORLD, IT PROVIDES A CLOSE ANALOG TO TEST WHAT HAPPENS ON MARS WITHOUT EVER LEAVING THE COMFORT OF OUR GRAVITY AND ATMOSPHERE.
WHILE THE WOMEN OF "MISSION MANGAL" MAY HAVE BEEN FICTIONAL, THEY REPRESENTED THE REAL WOMEN BEHIND INDIA"S FIRST MISSION TO MARS. THE MISSION THAT, IN JUST 18 MONTHS AND WITH A BUDGET OF ONLY $74 MILLION (LESS THAN THE BUDGET OF THE FILM "THE MARTIAN"), PLACED A SATELLITE IN ORBIT AROUND MARS. THE TEAM WORKED ANYWHERE FROM 10 TO 14 HOURS A DAY TO COMPLETE THE SEEMINGLY IMPOSSIBLE MISSION.
THERE APPEARS TO BE STRONGER EVIDENCE OF A POSSIBLE OCEAN ON ANCIENT MARS. A RECENT STUDY INDICATES THAT THE METEOR THAT CREATED THE 75-MILE LOMONOSOV CRATER MAY HAVE PRODUCED A "MEGA-TSUNAMI" THAT LEFT ITS MARK ON THE PLANET. ITS RIM IS THE SAME HEIGHT AS THE ESTIMATED DEPTH OF THE OCEAN AND RESEMBLES MARINE CRATERS ON EARTH. ALSO, A HOLE IN THE SOUTHERN LIP OF THE CRATER COULD HAVE BEEN THE RESULT OF THE OCEAN ROARING BACK FROM THAT DIRECTION. EARLIER EVIDENCE HAD HINTED THE OCEAN"S SHORES WERE SHAPED BY AT LEAST ONE IMPACT IN THE SAME GENERAL AREA AS THE LOMONOSOV CRATER -- THIS LATEST STUDY, HOWEVER, HAS NARROWED THINGS DOWN TO A SPECIFIC IMPACT SITE.
INDEED, MUSK ENGAGED HIS FOLLOWERS IN SIGNIFICANT DISCUSSION ABOUT THE IDEA, AS HE FREQUENTLY DOES ON TWITTER. FOR EXAMPLE, SOMEBODY SUGGESTED EMPLOYING "SOLAR DIRIGIBLE AIRSHIPS" ON THE RED PLANET TO INCREASE SOLAR-POWER AND HEAT GENERATION. "TRICKIER THAN IT MAY SEEM ON MARS, AS ATMOSPHERIC DENSITY IS 1% THAT OF EARTH & GRAVITY IS 38%, BUT DOABLE FOR LOCALIZED WARMING," MUSK RESPONDED.
ROLLING STONES FRONTMAN MICK JAGGER APPEARED SMITTEN WITH THE HONOR, OR HIS TONGUE MAY HAVE BEEN FIRMLY IN CHEEK.
WHILE NASA HAS ANNOUNCED IN JUNE THAT IT IS OPENING THE INTERNATIONAL SPACE STATION TO TOURISTS FROM 2020, WANNABE ASTRONAUTS MAY HAVE TO WAIT A WHILE TO VISIT MARS. ONE COMPANY, HOWEVER, IS MAKING IT POSSIBLE FOR ADVENTURERS TO EXPERIENCE LIFE ON THE RED PLANET NOW – WITHOUT LEAVING EARTH’S ATMOSPHERE.
INDEED, METHANE CAN BE PRODUCED ABIOTICALLY AS WELL — BY REACTIONS INVOLVING HOT WATER AND CERTAIN TYPES OF ROCK, FOR EXAMPLE. AND IT"S UNCLEAR IF THE METHANE DETECTED BY CURIOSITY (AND EUROPE"S MARS EXPRESS ORBITER, WHICH CONFIRMED ONE OF THE SURGES THE ROVER FOUND) IS MODERN OR ANCIENT. HOWEVER IT WAS ORIGINALLY GENERATED, THE GAS COULD HAVE BEEN TRAPPED UNDERGROUND FOR BILLIONS OF YEARS BEFORE BUBBLING UP TO THE SURFACE.
"MIGHT MAKE SENSE TO HAVE THOUSANDS OF SOLAR REFLECTOR SATELLITES TO WARM MARS VS ARTIFICIAL SUNS," MUSK TWEETED ON TUESDAY, SUGGESTING THAT THE BEST OPTION IS STILL "TO BE DETERMINED."
TIM ELLIS STARTED COLLEGE AS AN UNDECIDED-MAJOR AT USC. TODAY, THE 2012 AEROSPACE ENGINEERING ALUM IS REVOLUTIONIZING THE SPACECRAFT MANUFACTURING INDUSTRY BY 3-D PRINTING ROCKETS THAT MAY ONE DAY TAKE HUMAN BEINGS TO MARS.
AN ASTEROID HURTLED INTO EARTH 66 MILLION YEARS AGO, CREATING OUT A 93 MILE-WIDE (150KM) CRATER IN WHAT IS NOW THE GULF OF MEXICO. THE RESULTING BLAST WAVE ECHOED AROUND THE WORLD, WHILE THE IMPACT ALSO TRIGGERED A 100-METRE HIGH MEGA-TSUNAMI. NOW A NEW STUDY SUGGESTS MARS MAY HAVE SUFFERED A SIMILAR MEGA-TSUNAMI EVENT 3.7 BILLION YEARS AGO, AND SCIENTISTS THINK THEY HAVE SPOTTED GROUND-ZERO FOR THIS APPARENT ASTEROID IMPACT.
SCHIAPARELLI’S CANALS TURNED OUT TO BE AN OPTICAL ILLUSION, SAYS SLATE. MARS HAS REAL CHANNELS, DRY RIVERBEDS, BUT THEY DO NOT CORRESPOND TO ANYTHING HE SHOWED ON HIS MAP. SPACE MISSIONS SHOWED THAT MARS IS INDEED A GEOLOGICALLY DYING WORLD THAT HAS LOST MOST OF ITS WATER. BUT WHILE IT MAY STILL HAVE LIFE, IT OFFERS NO HINT WHATSOEVER OF AN ADVANCED CIVILIZATION, LIVING OR DEAD.
SO, WHILE THESE 'SNOWBALL' PLANETS ARE ONES THAT WE MAY HAVE PASSED OVER BEFORE, IN OUR SEARCH FOR ALIEN WORLDS THAT MAY SUPPORT LIFE, THIS NEW RESEARCH IS SHOWING THAT THEY DEFINITELY DESERVE SOME ATTENTION.
THE NORTHERN AND SOUTHERN HEMISPHERES ARE VASTLY DIFFERENT FROM ONE ANOTHER ON MARS, AND SUCH A STARK DIFFERENCE IS UNLIKE ANY OTHER PLANET IN THE SOLAR SYSTEM. PATTERNS OF INTERNAL MAGMA FLOW COULD HAVE CAUSED THE VARIATION, BUT SOME SCIENTISTS THINK IT IS THE RESULT OF MARS TAKING ONE OR SEVERAL MAJOR IMPACTS.
THE SKIN OF GRAPES CONTAIN A COMPOUND THAT MAY HELP PROTECT THE MUSCULOSKELETAL SYSTEMS OF FUTURE ASTRONAUTS BOUND FOR MARS. A PERSON ON A LONG-DURATION MISSION TO MARS WOULD HAVE TO ENDURE THE DETERIORATIVE EFFECTS OF THE PLANET"S GRAVITY, WHICH IS ABOUT 40% AS STRONG AS WHAT WE EXPERIENCE ON EARTH"S SURFACE.
IF THE MISSION MISSES THE 2020 LAUNCH WINDOW, IT WOULD HAVE TO WAIT UNTIL AT LEAST 2022 FOR ITS NEXT OPPORTUNITY TO LIFT OFF. (LAUNCH WINDOWS FOR MARS MISSIONS OPEN JUST ONCE EVERY 26 MONTHS.)
HOWEVER, SCIENTISTS KEEP TURNING UP NEW EVIDENCE THAT MARS SOMEHOW CLUNG TO HUGE AMOUNTS OF WATER LONG AFTER ITS MAGNETIC FIELD COLLAPSED, PERHAPS EVEN INTO THE LAST BILLION YEARS. SCIENTISTS AREN’T SURE HOW MARS COULD HAVE STAYED SO WET WITHOUT A PROTECTING ATMOSPHERE, BUT THE SIGNS KEEP PILING UP. THIS THUMBPRINT TERRAIN THAT FASCINATED COSTARD IS JUST THE LATEST TANTALIZING SIGN. IT’S ON THE EDGE OF A VAST LOW-LAYING PLANE THAT MANY SCIENTISTS THINK MIGHT ONCE HAVE BEEN A GIANT NORTHERN OCEAN.

 

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