Top Tweets for #RandomSpaceFacts
#Spaceflight: The Hohmann transfer is the most fuel-efficient way to travel between 2 planets. A spacecraft performs a single burn to xfer to an elliptical orbit intercepting the target. A Hohmann transfer to Mars takes 259 days but is possible only every 2yrs. #RandomSpaceFacts
#Spaceflight: Perseverance might have had the message 'dare mighty things' coded into the parachute, but Curiosity has JPL in morse code on its wheels. Oppy and Spirit each had aluminium recovered from the World Trade Center on board. @NASA calls it festooning. #RandomSpaceFacts
#Stars: Boson stars are not like other stars. At all. Consisting of bosons (the force-carrying particles, ie. not fermions) they are still only hypothetical. But if they are real, they are probably shaped like a donut and have transparent interiors. πΈ dullhunk #RandomSpaceFacts
#Life: To check whether life exists on an exoplanet we could look for biosignatures in its atmosphere. The Galileo spacecraft looked at Earth in the 90s, finding CH4 and O2 suggesting photosynthesis... OSIRIS-Rex did the same in 2017, but levels were far higher. #RandomSpaceFacts
#Spaceflight: Mars2020 helicopter Ingenuity has 6 Li-ion batteries that will be recharged on Mars by solar panels. The batteries will mostly be used to keep Ingenuity warm during the night, but there should be enough charge remaining for 90s of flight each day. #RandomSpaceFacts
#Light: How many photons are floating around us? From a light bulb, we get bombarded by ~10^20 photons every second. So lots but nothing like the Sun which emits ~10^45 every second. But the CMB created something like 10^90 photons, about 400 photons per cm^3. #RandomSpaceFacts
#Planets: The highest altitude a helicopter's flown on Earth was ~40,000'. But even at 'sea level' on Mars the air is so thin it's like being at ~100,000' on Earth. To fly in such thin air, the Mars helicopter Ingenuity's rotors spin 5x faster than typical. #RandomSpaceFacts
#Space: The UAE is the 5th country to get to Mars, but India was number 4 with the Mars Orbiter Mission, launched in 2013. Mangalyaan entered orbit in 2014 and continues its mission today, with a follow-up Mangalyaan-2 planned for luanch in 2024. πΈ ISRO/ISSDC #RandomSpaceFacts
#Space: Occupying most of the universe are voids, huge spherical volumes of space that are nearly completely empty. They have densities about 1/10th the average density of the universe. There are void galaxies, but most are in sheets, walls, filaments. #RandomSpaceFacts
#Space: Was there a primordial magnetic field? If so, it might help resolve the Hubble tension. It may have caused protons and electrons to combine earlier than they otherwise would've, changing measurements of the expansion rate from the CMB. πΈ Springel et al. #RandomSpaceFacts
#Planets: There's a dwarf planet about 1/3 the mass of Pluto out past Neptune that has its own ring system... Haumea is also the fastest spinning large object we know of, giving it an elongated shape and a day lasting about 4 hr. It also has 2 known moons. #RandomSpaceFacts
#Space: Let's talk space elevator - Obayashi Corp says they will build one by 2050, but China wants one ~2045. The tower will sit on the equator and rise to geostationary orbital height (a counterweight will extend further into space). πΈhttps://t.co/f0SwXs9Bih #RandomSpaceFacts
#Spaceflight: Heat doesn't dissipate from spacecraft in space all that easily... There is nothing much to convect and take it away. So the side of your spaceship facing the sun is going to get hot. Rotisserie mode was used for heat control on Apollo spacecraft. #RandomSpaceFacts
#Space: How do you make stars? Just get a big cloud of gas and let it collapse under its own weight? If that were all, the star formation rate in the Milky Way would be ~100x more than it is. Turbulence, magnetic fields and stellar feedback are also important. #RandomSpaceFacts
#Spaceflight: Until recently the laptops on the ISS (there are ~100) running mostly Windows and Linux were all some model of ThinkPad, but HP laptops were first flown to the station in 2016. iPads, Surface Pro, and various models of phones have also been used. #RandomSpaceFacts
#Light: Perytons are mythical hybrid stag-birds. They are also radio signals of terrestrial origin that mimic fast radio bursts. Commonly produced by prematurely opening the microwave door, they were discovered coming from the tea room at Parkes radio telescope. #RandomSpaceFacts
#Planets: Why not put a radio telescope on the Moon? Moonquakes, temperature extremes, lunar dust, the cost of building the telescope on the moon, the problem of maintenance, the need for an orbiter if it's on the far side, providing power. For starters... #RandomSpaceFacts
#Spaceflight: Coming in October 2021, the first mission to the Trojan asteroids, Lucy. Lucy is the name of a fossilized skeleton of a female about 3.2 million years old that provided unique insight into humanity's evolution... Just like the mission Lucy will do. #RandomSpaceFacts
#Stars: Is the Sun an average star? In the sense that there is nothing unique or exceptional about it then yes. But more than 75% of stars are M-type red dwarfs like Proxima Centauri with temperatures < 3,500 K, whereas the Sun is one of only 8% of G-type stars. #RandomSpaceFacts
#Planets: Like Ryugu, asteroid Bennu is the shape of a spinning top but smaller with a mean diameter of 0.5-km. It has 135 craters larger than 10-m diameter, with some larger than 80-m. Studying craters reveals it has been in a near Earth orbit for 1.75-mill yr. #RandomSpaceFacts
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