Astronomy and Astrophysics Forum

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Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
I Starlink and gaining energy from orbiting
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I Could a bubble shield at L1 combat global warming?
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B Effect of JWST mirror damage on final images
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I What do high-mass X-ray binaries, or HMXBs, tell us?
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I How to calculate an unknown planet's orbital period?
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I Help with Sunrise & Sunset formulas please
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I Amount of black hole entropy inside the Universe?
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B Question about deep space pictures
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What is the density of the Carina Nebula?
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I Is the eccentricity of the lunar orbit constant?
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I Confused by this armillary sphere in Australia
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I Mass distribution in a celestial system
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I Earth's orbit not perfect ellipse
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SpaceX says 5G expansion would make Starlink 'unusable' for most Americans
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From polar coordinates to heliocentric ecliptic coordinates
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B SOFIA IR Observatory in the Southern Sky
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I Why are Saturn's rings in its equatorial plane?
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B Mars Probe gets Windows 98 Update, after 19 years
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B Where can I find information about Population III stars?
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B Is it possible for a giant star to have a black hole inside it?
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I The gravitational center of the Earth
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I How to find RAAN and argument of perigee for a satellite?
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B How often do you re-acquire dark and bias frames?
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B Is Stellina the Ultimate Telescope for Amateur Astronomers?
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I Voyager Spacecraft beginning to Power Down
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B Where Can I Find Accurate Planetary Event Data for an Astronomy Course?
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B Has there been no update to Allen's Astrophysical Quantities since 1999?
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B Evolution of planetary system around a white dwarf
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I What is a typical mass density for inter-galactic gas in a cluster?
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A What is a Bern model in planetary population synthesis?
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B Sun contains more oxygen, silicon and neon than previously thought
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I Lateral offset from a centered star as measured at the focal plane
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I Magnetar Mystery: How Do Neutrons Generate a Magnetic Field?
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B Derivation for Aphelion and Perihelion Distances
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What is the current status of Voyager 1's attitude and control system?
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I How to use astronomical spectra?
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I European Southern Observatory (Event Horizon Project team) – picture of Sgr A*
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What day/exact time does Sun start to move again? (1980 Winter Solstice)
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I What happens first -- Sun Red Giant or Andromeda collision?
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I Dawn dead in Ceres orbit, ran out of fuel Oct 2018
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B Scope Eyepiece diameter for old eyes
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B Event Horizon Telescope, Milky Way supermassive black hole stream
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B Which Way Do Planets in Our Galaxy Spin?
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B Our Sun's position in the Milky Way Galaxy
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B How does the Milky Way galaxy move in the local Group?
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Stargazing Planetary Lineup and Eclipse Viewing Tips for Cruise Ship Passengers
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Stargazing Size of Star Images: Electronic Effect, Feynman Paths, or Daft Question?
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I Do gravitons interact with gravitons?
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B Would like to explore the Henry Draper catalogue of stars
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I A busy and interesting night sky in Mackinaw City
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B Mini spacecraft to Alpha Centauri
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I What Prevents Electrons from Expanding Radially in White Dwarfs?
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B First Interstellar Asteroid Found
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I First Interstellar Object to Hit Earth
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I Gravitational Field with Dark Energy: Observable Effects?
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Stargazing Hubble Spots Farthest Star Ever Seen
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I What Does Radiation Do to Space Ice?
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B Can electromagnetic waves traverse wormholes?
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Is Language Barrier a Reason for Our Limited Understanding of Black Holes?
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I MOND from galaxies that are fractal
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B Northern Lights Visible in Mid States Tonight
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B Why combine the JWST data physically instead of digitally?
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B Could anything heat back up the core of Mars?
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Stargazing Is There a Reliable Supernova Alert System?
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B What happens to the Core of a main sequence star as additional mass is added?
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I Is a horseshoe orbit a hyperbolic orbit?
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I Information loss in black hole, why is it a problem?
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I Does Dark Matter Fall into Black Holes?
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I Surface Differential Rotation by measuring the position of sunspots
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I Where does the Sol system lie in the cross-section of the Orion Spur?
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Stargazing Spotting Meteorites: Unveiling the Mystery of Annual Showers
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I How Does Gravity Affect Spectral Line Strength?
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I Back of the envelope estimate, energy flow in a box of plasma
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I What causes the precession of the equinox?
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B Is the Earth falling into the sun from gravity?
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I Universe Expansion: Does Less Dense Mean Boundaries?
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I Impact on Earth: Calculating Energy
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B The configuration of galaxies in space
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B Different stars visible from northern and southern hemispheres
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I Are Two Supermassive Black Holes on a Collision Course?
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Stargazing Upcoming Supernova? | Nature News
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B Revealing Secrets of Distant Supernova DES16C2nm: 10.5 Billion Years Ago
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B Light and the black matter (Dark Matter)
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B Asteroid/Near Earth object mining
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B Questions about Lagrange points in the Pluto / Charon system
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B Alcyoneus Radio Galaxy: Myth or Reality? Discover the Truth Here!
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I Energy conservation in Doppler (NOT cosmological) redshifts?
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I How to Experimentally Measure the MTF of a Lens?
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B NGC 4590, more than 1,400 stars found in various evolutionary stages
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I Radioactive Dating of Asteroid Elements: How Do Scientists Know?
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I What Are the Theories Behind the Moon's Formation?
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B I wonder why massive objects slow down time
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Stargazing Image JWST: Amateur Astronomy Success?
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B Can the "Dark Energy" concept be wrong?
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B Does the inertia of matter change in a black hole?
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I Can We Predict the Sun's Path from a Single Altitude Measurement?
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B How Can We Prove That Space is Expanding?
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B Why is the Webb Space Telescope placed at L2?
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B Chasing the Moon: Astronauts & Technology".
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I Ship Braking: Blue or Red Doppler Shift?
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