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The Surprising History of Scientific Ballooning in 11 Missions
a year ago
- NASA launched the GUSTO telescope via balloon over Antarctica to study star formation.
- Scientific ballooning has a 250-year history, contributing to major discoveries.
- 1783: First balloon flight with animal passengers by the Montgolfier brothers.
- 1804: Joseph Louis Gay-Lussac studied atmospheric gases at 23,000 feet.
- 1898: Léon Teisserenc de Bort discovered the stratosphere using balloon data.
- 1912: Victor F. Hess discovered cosmic rays via balloon experiments.
- 1931: Auguste Piccard designed a pressurized cabin for high-altitude balloon flights.
- 1947: Stratoscope I used balloons for high-resolution solar imaging.
- 1960: NASA's Echo 1 satelloon pioneered satellite communications.
- 1962: Operation Stargazer marked the last piloted scientific balloon flight.
- 1998: BOOMERanG experiment confirmed the universe's flat geometry.
- 2024: EXCITE mission studies exoplanet atmospheres via balloon.
What Did Hubble See on Your Birthday?
a year ago
- Hubble operates continuously, observing the universe every day of the year.
- Users can find out what Hubble observed on their birthday by entering their birth month and date.
- Encourages sharing Hubble birthday images on social media with #Hubble.
- Suggests using star charts to view celestial objects observed by Hubble with backyard telescopes or binoculars.
- Highlights Hubble's role in exploring various cosmic phenomena, including galaxies, exoplanets, and the dark universe.
- Notes Hubble's design for in-space servicing by astronauts, allowing for technological upgrades.
- Mentions Hubble's 34th anniversary and its latest image of the Little Dumbbell Nebula.
- Emphasizes Hubble's ongoing contributions to uncovering the mysteries of the universe.
Messier Marathon
a year ago
- A Messier marathon is an attempt to find as many Messier objects as possible in one night, organized by amateur astronomers.
- The Messier catalogue, compiled by Charles Messier, includes 110 bright deep-sky objects like galaxies, nebulae, and star clusters.
- Visibility of Messier objects depends on the observer's location, duration of daylight, and season.
- Best observed from low northern latitudes, especially around 25° north, during mid-March to early April.
- Southern hemisphere observers face difficulties due to some objects being too far north.
- The marathon involves observing from sunset to sunrise, starting with western objects and moving eastward.
- Organized marathons are held by astronomy clubs, sometimes offering certificates for participation or achievements.
- Challenges include weather conditions, observer stamina, and crowded sky regions like the Virgo Cluster.
Astronomers have found signs of alien life on a planet beyond our Solar System
a year ago
- Astronomers detected potential biosignatures (dimethyl sulfide and dimethyl disulfide) in the atmosphere of exoplanet K2-18b using the James Webb Space Telescope.
- K2-18b is located in the habitable zone of its star, 124 lightyears away, and is 8.6 times Earth's mass and 2.6 times its size.
- Previous studies in 2023 identified methane and carbon dioxide, suggesting K2-18b could be a 'Hycean' planet with a hydrogen-rich atmosphere and liquid ocean.
- The latest findings reached a 'three-sigma' statistical significance (0.3% chance of error), but further confirmation is needed to meet the 'five-sigma' threshold.
- Dimethyl sulfide and dimethyl disulfide on Earth are produced by microbial life, but their high concentrations on K2-18b (thousands of times stronger) raise questions about non-biological sources.
- The team used different instruments (NIRISS, NIRSpec, and MIRI) across multiple studies to analyze K2-18b's atmosphere, strengthening the evidence.
- Researchers emphasize skepticism and further testing to confirm these findings, which could mark a pivotal moment in the search for extraterrestrial life.
A star appears to have collapsed straight into a black hole without supernova
a year ago
- Astronomers observed a massive star likely turning into a black hole without a supernova explosion.
- The star, 25 times the mass of the sun, disappeared instead of exploding, suggesting a 'massive fail.'
- Up to 30% of massive stars may collapse into black holes quietly, without a supernova.
- The discovery helps explain why fewer supernovae are observed from the most massive stars.
- The findings could impact understanding of the origins of very massive black holes detected by LIGO.
- The research involved telescopes like LBT, Hubble, and Spitzer, with support from the National Science Foundation.
An Image of the Australian Desert Illuminates Satellite Pollution
a year ago
- Joshua Rozells captured satellite trails in his star trail photos in the Pinnacles Desert, Western Australia.
- He created a composite image from 343 photos to highlight increasing satellite pollution in the night sky.
- SpaceX's Starlink and other companies have launched over 10,000 satellites, with plans for tens of thousands more.
- Astronomers warn that unregulated satellite proliferation worsens light pollution and hinders astronomical research.
- Organizations like the International Astronomical Union are advocating for night sky protection and regulation.
Why 21 cm is our Universe's "magic length"
a year ago
- The 21 cm wavelength is a critical length in the Universe due to the hyperfine transition in hydrogen atoms.
- Hydrogen atoms have a 50% chance of forming with aligned spins (proton and electron), which is a higher-energy state than anti-aligned spins.
- The transition from aligned to anti-aligned spins emits light at precisely 21 cm wavelength, a key signal in astronomy.
- This 21 cm radiation is the narrowest and most precise transition line known in atomic and nuclear physics.
- The 21 cm signal can reveal early Universe conditions, star formation history, and even primordial gravitational waves.
- Measuring 21 cm radiation helps detect hydrogen-rich regions, even those without stars, providing insights into cosmic evolution.
- Future experiments, like LOFAR and lunar-based arrays, aim to map 21 cm signals to uncover the Universe's hidden secrets.
New analysis casts doubt on 'biosignatures' found on planet K2-18B
a year ago
- Astronomers are questioning the recent claim of detecting life-associated gases on planet K2-18b.
- An independent reanalysis by Jake Taylor suggests the data is too noisy to confirm biosignatures.
- Taylor's method was agnostic, not specifically targeting sulfur-based gases linked to life.
- Laura Kreidberg emphasizes the need for model-independent signals for robust detection.
- Original researchers defend their findings, citing a more realistic atmospheric model.
- More astronomers will review the data when it becomes publicly available on April 26th.
- Kevin Stevenson warns against premature claims to maintain public trust in science.
Astronomers find Earth-like exoplanets common across the cosmos
a year ago
- Astronomers discovered that super-Earth exoplanets are more common than previously thought using the Korea Microlensing Telescope Network (KMTNet).
- The study found that super-Earths can exist as far from their host star as gas giants are from the sun.
- Researchers estimated that for every three stars, there is at least one super-Earth with a Jupiter-like orbital period.
- Microlensing, an observational effect caused by mass warping space-time, was used to locate exoplanets like OGLE-2016-BLG-0007.
- Exoplanets were divided into two groups: super-Earths/Neptune-like planets and gas giants like Jupiter/Saturn.
- The findings challenge existing planet-formation theories, suggesting multiple mechanisms may be at play.
- Only 237 out of 5,000+ exoplanets have been discovered via microlensing due to its rarity.
- KMTNet's global telescope network, including Ohio State-designed KMTCam, enhances exoplanet detection capabilities.
- The study involved international collaboration and was published in the journal Science.
Hunting for dark nights and wishing on stars
a year ago
- The author describes a sunset in the desert, highlighting the unique way light interacts with the landscape.
- A reflection on the discomfort of biking and the contrast between outdoor activity and sedentary office life.
- The experience of setting up a campfire and observing the night sky, noting the visibility of constellations like Orion and Taurus.
- A discussion on the importance of connecting with the night sky, including tips for stargazing and understanding celestial movements.
- Observations on the increasing light pollution from nearby Las Vegas and its impact on the visibility of stars.
- Personal anecdotes about the changes in night sky visibility over the decades, comparing past experiences to the present.
- The use of a sky quality meter to measure light pollution and the challenges of finding truly dark skies.
- A brief mention of the upcoming book 'The Wild Dark: Finding the Night Sky in the Age of Light' by Craig Childs.
Vatican Observatory
a year ago
- The Vatican Observatory is one of the oldest active astronomical observatories, dating back to 1582.
- It employs over a dozen Jesuit scientists from various countries, conducting research on topics from interplanetary dust to the origins of the universe.
- The Observatory has contributed to discoveries in planetary sciences, cosmology, and stellar astronomy.
- Headquartered in Castel Gandolfo, Italy, it also has a research center in Tucson, Arizona.
- Most observational research is conducted at the Mt. Graham telescope in Arizona.
- The headquarters houses historic telescopes, an archive of astronomical plates, a scientific library, antique instruments, and a significant meteorite collection.
Exceptionally rare radio sources detected in the distant universe
a year ago
- Astronomers discovered a pair of radio relics, remnants of a collision between two galaxy groups, in cluster PSZ2 G181.06+48.47, located 963 million light-years from Earth.
- The radio relics, glowing arcs of radio energy, are the largest known to date, spanning about 11 million light-years apart.
- These relics formed from shockwaves generated by the collision, with the northern relic being brighter and polarized, while the southern one has a ghostly shape.
- The cluster is in the final stages of a merger that began a billion years ago.
- A faint glow at the cluster's center may be a 'radio halo,' caused by turbulence from the cosmic collision.
- Fewer than 30 galaxy clusters with relic pairs have been detected, but future radio surveys could uncover more.
- The cluster might receive a nickname based on its relic shapes, like the 'Eyebrows Cluster' or 'Air Quotes Cluster.'
18-Year-Old U.S. Teen Develops AI to Reveal 1.5M New Space Objects
a year ago
- Matteo Paz, a self-taught high school student, discovered 1.5 million new space objects by analyzing old NASA archives.
- Paz developed a machine learning algorithm in six weeks to detect changes in celestial bodies' brightness, indicating astrophysical phenomena.
- The algorithm processed massive data with high accuracy, identifying 1.5 million previously uncatalogued variable objects.
- This discovery is one of the largest updates to the universe's map, showcasing AI's potential in astronomy.
- The project highlights the importance of combining computer science and astrophysics in education for future scientific breakthroughs.
A star has been destroyed by a wandering supermassive black hole
a year ago
- A system in 2024 detected an unusual brightening object, later identified as the first visual-wavelength tidal disruption event (TDE).
- The TDE, named AT2024tvd, involved a star being torn apart by a supermassive black hole not located at the galaxy's center.
- The Zwicky Transient Facility, which scans the northern sky every two days, initially missed identifying AT2024tvd as a TDE due to its off-center location.
- Supermassive black holes typically reside at galaxy centers, so the software only flagged potential TDEs aligned with known light sources.
- AT2024tvd was over 2,500 light years from the galaxy center, leading to its initial misclassification until closer examination revealed its true nature.
Galactic Coordinate System
a year ago
- The galactic coordinate system is a celestial coordinate system centered on the Sun, aligned with the Milky Way's center.
- It uses spherical coordinates with galactic longitude (l) and latitude (b), analogous to terrestrial longitude and latitude.
- The system was standardized in 1958 by the IAU, adjusting previous definitions by 32° in longitude and 1.5° in latitude.
- The north galactic pole is located in the constellation Coma Berenices, and the south pole in Sculptor.
- Sagittarius A* marks the Galactic Center, with coordinates slightly offset from the defined center but within error margins.
- Conversion formulas exist to transform between equatorial and galactic coordinate systems.
- Rectangular variations of galactic coordinates are used for computing space velocities of galactic objects.
- The galactic equator passes through several constellations, including those traditionally associated with the Milky Way.
Taking a look at the next generation of telescopes
a year ago
- The Tuesday Telescope focuses on real science and the wonders of the universe, contrasting with pseudoscience like horoscopes.
- This week's feature is the Extremely Large Telescope (ELT) under construction in Chile's Atacama Desert, with a 39-meter primary mirror.
- The ELT is part of a competition with other large telescopes like the Giant Magellan Telescope (25.4m) and the stalled Thirty Meter Telescope in Hawaii.
- These next-generation telescopes promise a revolution in our understanding of the cosmos, with first light expected before the end of the decade.
- The article invites readers to submit photos for the Daily Telescope feature.
Weird planet is orbiting backwards between two stars
a year ago
- Researchers have confirmed the existence of a planet in the Nu Octantis star system, resolving a long-standing debate.
- The planet in Nu Octantis has a retrograde orbit, moving in the opposite direction to one of the stars, which stabilizes the system.
- Improved measuring devices, like the HARPS spectrograph, provided conclusive evidence of the planet's existence.
- One of the stars in the Nu Octantis system is a white dwarf, complicating the system's history and the planet's formation.
- The planet's current orbit suggests it either shifted trajectory after one star became a white dwarf or formed from ejected stellar material.
- Nu Octantis challenges conventional views of planetary systems, encouraging scientists to explore diverse star and planet formation scenarios.
An Extreme Cousin for Pluto? Possible Dwarf Planet at Solar System Edge
a year ago
- Discovery of a potential dwarf planet named 2017 OF201 at the edge of the solar system.
- The object has an extreme orbit, taking approximately 25,000 years to complete, with an aphelion 1600 times Earth's orbit and a perihelion similar to Pluto's.
- 2017 OF201's orbit suggests complex gravitational interactions, possibly involving ejection to the Oort cloud and return.
- The object's diameter is estimated at 700 km, making it the second largest known in such a wide orbit.
- Discovery challenges the hypothesis of Planet X or Planet Nine due to its outlier orbit.
- Found using archival data and a computationally efficient algorithm, highlighting the power of open science.
- Suggests the presence of many more similar objects in the outer solar system, currently undetectable.
- Implications for understanding the outer solar system, indicating it's not as empty as previously thought.
Are the Colors in Astronomical Images 'Real'?
a year ago
- Astronomical images from telescopes like Hubble and JWST do not show objects as they would appear to the naked eye.
- Human vision relies on rods and cones in the retina, with cones detecting red, green, and blue light to perceive color.
- Digital cameras use pixels with color filters (red, green, blue) to approximate human vision, but the match is not exact.
- Astronomical cameras often use larger filters covering the entire field of view, producing 'true color' images that are still approximations.
- For scientific research, astronomers prefer analyzing individual color-filtered images rather than combining them into three-color photographs.
- Many astronomical objects emit light at specific wavelengths (line spectrum), requiring narrow-band filters to study their composition and properties.
- Nebula photographs often use narrow-band filters, resulting in images that differ significantly from what the human eye would see.
- The term 'false color' is misleading; these images represent different wavelengths of light (e.g., infrared, ultraviolet) mapped to visible colors.
- Hubble and other telescopes often use multiple filters (five or more) to create vibrant, detailed images that reveal otherwise invisible features.
- The processing of astronomical images depends on their purpose, balancing scientific accuracy and aesthetic appeal.
Show HN: Moon Phase Algorithms for C, Lua, Awk, JavaScript, etc.
a year ago
- A collection of snippets calculates the moon's phase in various programming languages.
- Supported languages include C/C++, Rust, Zig, Lua, JavaScript, Python, awk, and bc.
- Functions take time input (e.g., Unix epoch seconds) and return the moon's age in radians.
- The illuminated fraction of the moon's surface is derived using (1-cos(x))/2.
- Moon age can be converted to days by multiplying by ~29.5.
- Phase index is determined using illuminated fraction and angle for naming and emoji representation.
- All implementations are self-contained, pure, and based on John Walker's moontool algorithm from the 80s.
- Test cases are included to demonstrate illuminated fraction and percent calculations.

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#astronomy

The Surprising History of Scientific Ballooning in 11 Missions

What Did Hubble See on Your Birthday?

Messier Marathon

Astronomers have found signs of alien life on a planet beyond our Solar System

A star appears to have collapsed straight into a black hole without supernova

An Image of the Australian Desert Illuminates Satellite Pollution

Why 21 cm is our Universe's "magic length"

New analysis casts doubt on 'biosignatures' found on planet K2-18B

Astronomers find Earth-like exoplanets common across the cosmos

Hunting for dark nights and wishing on stars

Vatican Observatory

Exceptionally rare radio sources detected in the distant universe

18-Year-Old U.S. Teen Develops AI to Reveal 1.5M New Space Objects

A star has been destroyed by a wandering supermassive black hole

Galactic Coordinate System

Taking a look at the next generation of telescopes

Weird planet is orbiting backwards between two stars

An Extreme Cousin for Pluto? Possible Dwarf Planet at Solar System Edge

Are the Colors in Astronomical Images 'Real'?

Show HN: Moon Phase Algorithms for C, Lua, Awk, JavaScript, etc.