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.
Undergrad Unexpected findings in need of an explanation (retrograde motion of Mars)
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Undergrad How can a multiple conjunction occur during a retrograde motion?
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Undergrad What keeps dark matter in galactic halos?
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Undergrad Rotation curve in spiral galaxy velocity and uniform velocity dispersion
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Undergrad Galaxy MoM-z14 - furthest observed object
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Undergrad Practical cosmic speed limit for macroscopic objects?
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Undergrad How our Moon and Sun may affect Earth's equatorial bulge
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Undergrad Luminous Fast Blue Optical Transients (LFBOTs)
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Undergrad Question of accuracy of galactic collision simulations
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Undergrad Could Venus be a 'Soot World'?
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Undergrad Is there anything inside a black hole?
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Undergrad Population 3 star (Pop III) candidate LAP1
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Undergrad Visible light Over Large Distances
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Undergrad How feasible is home radio astronomy?
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Undergrad Are There Two Suns? Exploring the Phenomenon of Sun Dogs
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Undergrad Potential biosignature found in Mars rock
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Undergrad Does it make sense to build new radio telescopes?
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Undergrad Could fast radio bursts be alien radar signals?
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Undergrad How to explain the strange pulsar in the Crab Nebula?
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Undergrad Why are continuously emitting radio pulsars not detected?
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Undergrad Time interval terminology
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Undergrad How Does the Balloon Analogy Explain the Expansion of the Universe?
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Undergrad Sun gravitational lensing forces
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Undergrad Large Synoptic Survey Telescope -> Vera C. Rubin Observatory
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Undergrad Questions on Expansion of the Universe and Newtonian Physics
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Undergrad How 'Messy' are Fusion Reaction Chains in Stars?
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Undergrad Help with my Polar Aligning Star Tracker please
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Undergrad IRAF 2025?
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Undergrad If We Crack the Neutron Star Equation of State, How Will It Change Our Daily Lives?
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Undergrad Gravitational wave effects on different materials
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Undergrad Mass Loss on an HR diagram
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Undergrad Magnitude where the Pale Dot is blue?
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Undergrad Galaxy GNZ11 33 billion light-years away
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Undergrad Why Do Nebulae only have Hydrogen, Oxygen and Sulfur?
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Undergrad Confused about Stonyhurst Grid and jHelioViewer
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Undergrad How can the Universe be infinite?
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Undergrad Speediest Exoplanet System
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Undergrad Can Staging Rockets Achieve Faster-Than-Light Travel Despite Relativity?
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Undergrad The initial density of an object and its compression into a black hole
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Undergrad Would discovery of a galaxy without dark matter disprove MOND?
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Undergrad Cosmic ray origins
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Undergrad How big a lunar radio telescope to detect Earth-like signals?
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Undergrad What affects light near black holes and stars?
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Undergrad Nature paper on Moon's initial evolution - Tidally driven remelting
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Undergrad The Heavier Elements: A Question About Their Abundance
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Undergrad Moon phase ruins my Stargazing!
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Undergrad Expansion of a star to become a red giant
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Undergrad How to graph Earth's path?
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Undergrad Possibility of multiple planets sharing the same orbit?
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Undergrad Is this the correct representation for showing the direction of a star on CMD?
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Undergrad Does light bend around black holes?
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Undergrad New Developments In The Search For Planet X
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Undergrad Right ascension and Declination calculations
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Undergrad The brightness and linear polarization of pulsars
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Undergrad Rotation curve of a gas disk in an elliptical galaxy
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Undergrad J0524-0336, surprisingly high Li concentration
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Undergrad Can there be free electrons in interstellar gas?
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Undergrad Regarding the accuracy of the description of a pulsar in a 1977 paper
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Undergrad Wow! signal could be from interstellar hydrogen clouds
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Undergrad Comet A117uUD Goes Interstellar after Encountering Saturn in 2022
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Undergrad What Factors Create the Windiest Exoplanets?
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Undergrad Any Galaxy (Milky-way) based coordinate systems?
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Undergrad Galaxy collision separates dark matter from regular matter
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Undergrad Shell structure topological defects as substitute for dark matter
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Undergrad Stable solutions to simplified 2- and 3-body problems?
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Undergrad Very bright geo satellite in my night sky?
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Undergrad What is the Possibility of Habitable Planets Around Brown Dwarfs?
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Undergrad Why can't we photograph magnetic lines of force emitted by planetary and beyond objects (like we can for the Sun)?
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Undergrad Early Universe massive Black Holes question
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Undergrad Galaxies as systems extended from the solar system
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Undergrad Does Organic Matter Experience Gravity on the Moon?
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Undergrad Unknown Radio Signal from Space Repeats Every Hour -- Usually
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Undergrad Is the Universe Truly Infinite?
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Undergrad Retro/prograde flyby galaxies and their bar formation
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Undergrad How Does Vera Rubin's Research Support the Existence of Dark Matter in Galaxies?
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Undergrad Observational Astronomy Project Ideas to Show Special Relativity
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Undergrad Deriving the Roche limit(d) for body of mass M and satellite m
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Undergrad Questions about Black Holes, Hawking Radiation, and Dark Matter
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Undergrad Can time on elliptical orbit be expressed analytically?
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Undergrad Light curving around vortex simulating a black hole
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Undergrad Determining stellar mass independent of its gravity
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Undergrad Why on Earth do we not see older stars close to us?
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Undergrad Need help simplifying standard error formula for redshift
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Undergrad Sun shade on Earth ground, is it a straight line or a curved line?
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Undergrad Orientation of the Earth, Sun and Solar System in the Milky Way
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Undergrad The linear polarization and brightness of pulsars
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Undergrad Where Are the Missing Black Holes in the Milky Way?
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Undergrad How fast were distant galaxies moving?
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Undergrad Speed of the umbra during eclipse vs rate of the Earth's rotation
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Undergrad Increase frequency of solar eclipses
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Undergrad Can there be slowly-falling accretion disks in black holes?
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Undergrad Solar anomaly and the Antikythera Mechanism
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Undergrad Atmospheric escape parametre statistics
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Undergrad Stellar evolution path and Regression line
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Undergrad How Does the Size of Neutron Stars Compare to Black Holes?
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Undergrad How Can Measured Satellite Magnitudes Be Converted to Radiant Intensity?
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Undergrad Is the Sun's photosphere fluorescent?
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Undergrad What are the Dynamics and Impacts of a Type II Supernova?
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Undergrad Why Does Spectral Line Darkening Occur Despite Photon Re-Emission?
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Undergrad Adding more meteorites to my collection
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