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Space Science

@spacescience

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Making complex space science easier to understand through accurate, well-researched explanations.
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The physical laws of our universe might permanently trap humanity inside the solar system. Even if we master advanced propulsion and build massive colony ships, the sheer distance to the nearest stars presents a barrier that technology may never overcome. Proxima Centauri is over four light years away, and reaching it within a single human lifetime requires traveling at a significant fraction of the speed of light. Getting any spacecraft with humans aboard to move that fast takes an unbelievable amount of energy. Accelerating a moderately sized crewed ship to just ten percent of the speed of light would require more power than the entire planet currently uses in a year. Traditional chemical rockets would take tens of thousands of years to make the trip, meaning any interstellar mission would have to rely on theoretical antimatter engines or massive fusion drives that might prove physically impossible to engineer. Beyond the energy problem, the void between stars is an incredibly hostile environment for human biology. A journey lasting decades or centuries exposes travelers to constant cosmic radiation and severe physical degradation from living outside the gravity of a planet. Even if a multi-generational ship could survive the mechanical journey, keeping a closed biological ecosystem stable for hundreds of years is a challenge we currently have no way to solve. We will almost certainly send small robotic probes to other star systems to beam data back to Earth. But the reality of physics suggests actual human footprints might never press into the dirt of an exoplanet. If we are truly confined to our own solar system forever, how does that change the way we should manage our future here on Earth? by @spacescience
103
15 hours ago
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165 million square kilometers (about 60 million square miles), accounting for nearly one-third of Earth's total surface area. The Pacific is larger than all of Earth's landmasses combined, with enough room left over to fit all the continents inside its basin. Water covers roughly 71% of Earth's surface overall, and the oceanic hemisphere (centered near New Zealand) contains close to 90% water coverage. From this angle, major continents like Africa and Eurasia are hidden, leaving only scattered island chains (such as Hawaii, New Zealand, and French Polynesia) and the faint edges of the Americas or Australia visible. by @spacescience
24
3 days ago
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Humans have left roughly 500,000 pounds (over 200 tonnes) of equipment, spacecraft, and unusual mementos across the lunar surface. To save weight and make room for valuable moon rocks, Apollo astronauts jettisoned heavy gear and personal items before returning to Earth. by @spacescience
16
5 days ago
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Betelgeuse is destined for a supernova explosion that will be bright enough to see during the day, but it may not happen anytime soon. While the red supergiant star is in the final stages of its life cycle and will eventually explode, astronomers estimate this event could happen tomorrow or anytime within the next 100,000 years. Recent dramatic dimming events led to speculation that the explosion was imminent, but observations confirmed the cause was actually a massive ejecting cloud of dust blocking its light. by @spacescience
58
7 days ago
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Which is your favourite?? For me, pale blue dot. The Pale Blue Dot (1990) is widely regarded as the most iconic, capturing Earth from 3.7 billion miles away (nearly 4 billion miles, 6 billion kilometers) as a tiny speck suspended in a sunbeam. by @spacescience
27
8 days ago
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Galaxies are massive cosmic islands holding millions or billions of stars, all bound together by gravity alongside vast clouds of gas and dust. While scientists estimate there are more than 100 billion galaxies scattered across the universe, a backyard telescope can reveal several of our closest and largest neighbors. Historically, these distant objects appeared only as faint, ghostly smudges in the night sky. It wasn't until the early 20th century that astronomer Edwin Hubble revolutionized science by proving these structures were not nearby nebulae, but entirely separate galaxies existing far beyond our own Milky Way. by @spacescience
6
9 days ago
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The universe contains enormous pockets of nearly empty space known as cosmic voids, and some are so vast that crossing them would mean traveling for hundreds of millions of years without encountering a single astronomical object. If you drifted into one of these supervoids, you could easily spend more than 750 million years moving through pure emptiness before running into anything solid or structured. The most famous example is the Bootes Void, which astronomers discovered in 1981 while mapping the large-scale distribution of galaxies. Spanning roughly 330 million light-years across, it sits about 700 million light-years away from Earth. A typical region of space that size should hold thousands of galaxies, but scientists have detected only a few dozen scattered inside it. Astrophysicists propose that these massive cavities formed as matter was pulled outward by the gravity of surrounding galaxy clusters, effectively emptying the region over billions of years. Smaller voids likely merged together like soap bubbles combining, leaving behind an expanse so desolate that if the Milky Way were located in the center, we would not have easily spotted other galaxies until modern telescopes arrived. How do you picture the physical reality of being caught in that kind of absolute emptiness? by @spacescience
85
10 days ago
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NASA released onboard video and a massive media archive from the Artemis II Mission Data Release showing the Orion spacecraft's extreme reentry through Earth's atmosphere. Cameras inside the Orion capsule captured the sky shifting from black to blue, superheated glowing plasma, and fiery light filling the windows. The footage tracks the fiery descent, reaction control thrusters firing for stabilization, drogue and main parachute deployments, and final splashdown. The October 2026 release includes over 11,000 images and videos, 8.5 hours of crew audio, and more than 800 gigabytes of mission data. by @spacescience
2k
11 days ago
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Since 1970, Earth Day has existed to showcase our beautiful planet, third from the sun. More specifically, Earth Day has been used to highlight the various environmental problems, such as climate change, that our planet has faced due to industrial and technological advances. We only get one big, beautiful blue planet, after all. by @spacescience
3
13 days ago
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Voyager 2’s 1989 flyby suggests Triton, Neptune’s moon, was captured from the Kuiper Belt, disrupting the orbits of Neptune’s original moons. Io, Jupiter’s innermost moon, is the most volcanic world in the solar system due to gravitational forces from Jupiter and its neighbouring moons. Hyperion, Saturn’s moon, is unique for its chaotic rotation and sponge-like surface, possibly a remnant of a larger satellite destroyed by a comet collision. by @spacescience
15
14 days ago
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October 4: Saturn reaches opposition and appears at its largest and brightest, offering excellent views of its rings. October 5: A crescent moon and Mars pair closely in the predawn sky, with the Beehive Cluster visible just below the moon. October 8 to 9: The Draconid meteor shower peaks overnight, producing about 10 meteors per hour under dark skies. October 10: A new moon provides optimal dark skies for viewing and photographing the Milky Way galactic core. October 12: Mercury reaches its greatest eastern elongation, making it visible near the western horizon after sunset. October 21 to 22: The Orionid meteor shower peaks in the predawn hours, bringing up to 20 bright, fast meteors per hour. October 26: The full hunter's moon peaks just after midnight and may display an orange tint as it rises and sets. October 27: A lunar occultation occurs as the moon temporarily passes in front of several stars in the pale blue Pleiades cluster. by @spacescience
2
18 days ago
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Which of these “impossible planets” surprised you the most? NASA has discovered dozens of exoplanets that seem to break the rules of planetary formation. These worlds are so strange that some astronomers have called them “impossible” because they challenge what our current models say should exist. From giant planets orbiting impossibly close to their stars, to worlds denser than solid iron, to planets surviving in environments where they should have been destroyed long ago, these cosmic oddities continue to force scientists to rethink how planets form and evolve. While we don't have all the answers yet, every new discovery helps us uncover just how diverse and surprising the universe really is. by @spacescience
50
19 days ago
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