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.
Stargazing Why no Phase Contrast Telescopes?
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B An Ancient Solar Storm 9200 years ago is Cause for Concern
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I Portable telescopes inside the International space station (ISS)
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B The Colors of The Moon (Doppler Effect)
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I Antimatter-matter asymmetry, Law of charge
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I SN 2019hgp, new type of supernova? Wolf-Rayet progenitor?
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I Balmer Absorption Lines in Different Temperature Stars
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Is the animation/graphics for NASA's Webb telescope in error?
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B Understand Bonnar-Ebert Model: Complement to Jeans Law?
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I Gaia vs DESI: Comparing Largest Star Maps Ever
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I Optimizing Sensor Thickness for Efficient Optical Wavelength Detection?
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I Is the false vacuum theory not well accepted?
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B What is the mass distribution and rotation curve of galaxy IC1101?
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I Jupiter atmosphere, turbulence and ocean fluid dynamics
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I Force of gravity on JWST while orbiting L2
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A Viewing Constellations from Opposite Hemispheres
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I Does gravity compress matter in planets?
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I We watched a red supergiant explode to ordinary type II supernova
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I Do Stars Fuse Elements Heavier Than Iron Before Imploding?
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B Lunar libration time lapse with real photographs?
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B Propellantless Rocket: Unleashing the Power of Breit-Wheeler
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I How is light modeled in astrophysics?
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I How to change CSpice initial velocity from an Asteroid SPK file?
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Stargazing Understanding the Chandrasekhar Mass Units for Relativistic Lane Emden Equations
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B What If Universes Were Made of Antimatter?
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B So, a black hole and an antimatter star bump into each other....
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B Question about a horizontal sundial
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I Cosmological Positioning - How does one determine?
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Stargazing 3D/2D Universe Model (DSO, stars etc.)
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B What do they mean when they say something is so many light years away?
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I Is EK Draconis' binary status a factor in its ability to produce large CMEs?
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Stargazing Level of details in prime focus vs eyepiece images
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I How Big of an Object Orbiting Closer to the Sun Than Earth Could Be Overlooked?
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A How Does the Ring Current Persist Despite Short-Lived Particle Drift?
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I Why is the Big Bang shown always directional, instead of globally?
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I What are the Coordinates of Sagittarius A* at Different Julian Century Dates?
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I History of astronomy and the Phases of Venus
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A Molecular cloud collapsing and fragmentation
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I Ultraluminous X-ray source in the galaxy NGC 55
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I A New Idea for the Origin of Earth's Water
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I Dark Matter as a condensation of photons in a space
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B Process of a sun changing into a white dwarf
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I What is the average distance between objects in the Kuiper belt?
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A How is the Temperature of Gas in a Cluster Calculated?
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I Reading Paper on Earth Occultation Technique
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B What is the Maximum Mass of a Neutron Star?
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B Observational bias? Lack of massive black hole observations....
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I Is the Sun a low-mass star or a medium-mass star?
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I Questions about the Voyager spacecraft
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I How Does Earth's Rotation Vary Daily?
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I Relativistic Doppler Effect near a Black Hole
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B Mass transfer between neutron stars in a binary pair
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I How do gravitational waves differ from the expansion of the Universe?
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I Why do gravitational waves travel at the speed of light?
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I Bias and dark current from a graph of mean signal vs exposure time
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I Composition of Jupiter: Ices, Cores & Outer Gas Layers
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I The definition of volume inside black hole?
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B Stars massive enough to evolve into black holes
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B Name of projection to firmamentum (celestial sphere)
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B Navigating To Another Star System
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A COG calculation of diffracted spots on a camera
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A Can Background Radiation Serve as a New Coordinate System in Astronomy?
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I Stromgren photometric data in Vizier
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I Simulation debugging for Apollo Lunar Landing
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I Encircled energy for different aperture shapes (circle, triangle, square)
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B Question re Webb telescope at L2
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B Visit to Hayden Planaterium -- The projector is gone?
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I Issue with Stellarium: transit of Venus (find the parallax)
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Stargazing Better than Mars Colonization in many aspects.
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Stargazing Star appearing to move ping pong like rapidly
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A Obtaining the noise level of a camera
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I Confused about declination, elevation & altitude
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Stargazing Does an Analemma visualize the Earth's actual orbit around the sun?
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B Radiation Levels at Earth's Poles
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I Collision between the Milky Way and Andromeda and Redshift
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Stargazing Troubleshooting My Orion 130 Reflector
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B Acceleration of time due to entropy
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I About the relation between number of sidereal and solar days
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B Delta-v from Lagrange points to lunar surface?
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I Assumptions for blackbody spectra vs. emission spectra vs. absorption spectra
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Stargazing Calculating the Resolving power of a Telescope
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B Is there a way of creating placemarks in Stellarium?
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A Analemma layout and proportions on a sundial
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I Newton's 3rd law and ether in space
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B Question about the solar system and gravitational forces
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I Planetary Formation: Could Collisions Explain Our Solar System?
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B Pressure under the ice of Europa?
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I What Are These Mysterious Objects Spotted Near Orion?
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I Evidence for existence of a 9th Planet in the solar system
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I Is the existence of a Dyson Sphere impossible?
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I Dark matter + gravity is 'right', or our understanding of gravity is wrong?
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I Could Titan Be Our Next Home for Colonization?
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I Is Dark Matter Composed of Low-Mass Particles?
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I Orbital distance increase during the white dwarf phase of the Sun
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B Definition of Stellar Parallax from Alonso and Finn Volume 1
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I Black holes and relation to creation
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B How Sensitive Must SETI Arrays Be to Detect Extraterrestrial Signals?
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I N-body simulation of high or low-mass dark matter particles
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I Dark Sky Parks -- coming to a park near you
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A Radius of the Sun: Can We Accurately Predict It Through Theoretical Models?
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