Daily Space Puzzle

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#45 Wed, 11 Nov 2026todayOrbits
#44 Tue, 10 Nov 2026Solar systemUranus spins nearly on its side. What is its axial tilt?
#43 Mon, 9 Nov 2026OrbitsAt roughly what altitude above Earth do geostationary satellites orbit?
#42 Sun, 8 Nov 2026Space historyAfter an oxygen tank ruptured on Apollo 13 in April 1970, what did the crew use as a lifeboat to get home?
#41 Sat, 7 Nov 2026Solar systemVenus spins so slowly that one rotation lasts longer than its 225-day year. About how many Earth days does one rotation take?
#40 Fri, 6 Nov 2026RocketsSpecific impulse, a standard measure of rocket engine efficiency, is expressed in which unit?
#39 Thu, 5 Nov 2026Solar systemIn what year is Halley's Comet next due back in the inner solar system?
#38 Wed, 4 Nov 2026RocketsAccording to CNSA, which propellants does China's Long March 5 heavy rocket use?
#37 Tue, 3 Nov 2026Space historyWhich animal, launched aboard Sputnik 2 on November 3, 1957, was the first to orbit the Earth?
#36 Mon, 2 Nov 2026Human spaceflightContinuous human presence aboard the International Space Station began when the Expedition 1 crew arrived. On what date?
#35 Sun, 1 Nov 2026Solar systemWhich is the only planet in our solar system with an average density less than water?
#34 Sat, 31 Oct 2026RocketsWhich liquid engine powers the second stage (PS2) of India's PSLV rocket?
#33 Fri, 30 Oct 2026Space historyAfter the Apollo 1 fire on January 27, 1967, which took the lives of Gus Grissom, Ed White and Roger Chaffee, what change did NASA make to the command module hatch?
#32 Thu, 29 Oct 2026Solar systemWhich world is the most volcanically active in the solar system?
#31 Wed, 28 Oct 2026RocketsThe two BE-4 engines on ULA's Vulcan booster burn liquid oxygen and which fuel?
#30 Tue, 27 Oct 2026Space historyGemini VIII achieved the first docking of two spacecraft in orbit on March 16, 1966. What did it dock with?
#29 Mon, 26 Oct 2026Solar systemIn what year did the International Astronomical Union reclassify Pluto as a dwarf planet?
#28 Sun, 25 Oct 2026RocketsJapan's H3 rocket uses the LE-9 as its main engine. Which engine cycle does JAXA say the LE-9 uses?
#27 Sat, 24 Oct 2026Space historyOn March 18, 1965, Alexei Leonov became the first person to float freely outside a spacecraft. Which spacecraft did he leave?
#26 Fri, 23 Oct 2026Solar systemIn which crater did NASA's Perseverance rover land on Mars?
#25 Thu, 22 Oct 2026RocketsWhich engine powers the main (core) stage of Ariane 6?
#24 Wed, 21 Oct 2026Space historyValentina Tereshkova became the first woman in space aboard Vostok 6 in June 1963. What was her radio call sign?
#23 Tue, 20 Oct 2026Solar systemWhich asteroid did NASA's OSIRIS-REx sample and bring back to Earth?
#22 Mon, 19 Oct 2026RocketsIn which year did Europe's Ariane 6 rocket make its first launch?
#21 Sun, 18 Oct 2026Human spaceflightOn October 18, 2019, which two NASA astronauts conducted the first all-woman spacewalk?
#20 Sat, 17 Oct 2026Space historyJohn Glenn became the first American to orbit Earth aboard Friendship 7 on February 20, 1962. How many orbits did he complete?
#19 Fri, 16 Oct 2026Solar systemIn what year did NASA's New Horizons fly past Pluto?
#18 Thu, 15 Oct 2026Human spaceflightYang Liwei became China's first astronaut aboard Shenzhou V in October 2003. How many times did the spacecraft orbit Earth?
#17 Wed, 14 Oct 2026Solar systemHow many close flybys of Jupiter's moon Europa is NASA's Europa Clipper planned to make?
#16 Tue, 13 Oct 2026Solar systemNASA's Psyche is the first mission to explore an asteroid whose surface contains substantial amounts of what?
#15 Mon, 12 Oct 2026RocketsWhat is the name of the engine that powers Rocket Lab's Electron rocket?
#14 Sun, 11 Oct 2026Space historyAlan Shepard's Freedom 7 flight on May 5, 1961, made him the first American in space. What kind of flight was it?
#13 Sat, 10 Oct 2026Space industry and lawIn which year did the Outer Space Treaty enter into force?
#12 Fri, 9 Oct 2026Solar systemWhich spacecraft was the first to fly by Neptune?
#11 Thu, 8 Oct 2026RocketsWhen did a Falcon 9 first stage first set down on a landing pad after launching satellites toward orbit?
#10 Wed, 7 Oct 2026Space historyYuri Gagarin became the first human in space on April 12, 1961. How many times did he orbit the Earth?
#9 Tue, 6 Oct 2026RocketsHow many RS-25 engines power the core stage of NASA's Space Launch System (SLS)?
#8 Mon, 5 Oct 2026Solar systemBepiColombo, a joint mission of ESA and JAXA, is on its way to which planet?
#7 Sun, 4 Oct 2026Space historyOn what date did the Soviet Union launch Sputnik 1, the first artificial satellite?
#6 Sat, 3 Oct 2026Solar systemWhich is the largest moon in the solar system?
#5 Fri, 2 Oct 2026Human spaceflightAbout how many times does the International Space Station orbit Earth in 24 hours?
#4 Thu, 1 Oct 2026Solar systemWhich planet is the hottest in our solar system?
#3 Wed, 30 Sept 2026RocketsHow many Merlin engines power the first stage of SpaceX's Falcon 9?
#2 Tue, 29 Sept 2026Space historyOn what date did Apollo 11's lunar module Eagle land on the Moon?
#1 Mon, 28 Sept 2026Solar systemWhat are the names of Mars' two moons?

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