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.
B Exoplanets - Suspicious evidence and fantastical conclusions
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Stargazing Astro Image Stacking (optimize DSS image stacking and post processing)
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A Lagrangian vs pseudo-Lagrangian vs Eulerian
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B Why didn't the Moon go fully red for this eclipse?
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B Is There a Reference Point for the Expansion of the Universe?
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B Hyperloop - Orbital Space Launch
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B Earth from Space: What Would Hubble See?
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B Could Solar Radiation Explain 'Oumuamua's Strange Trajectory?
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B The Hubble WFC3 instrument has stopped working
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I Supermassive black hole eating a stellar black hole
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B Skydiving from Space -- maximum altitude?
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B How high can a helium baloon rise to space?
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I Would it be possible to observe an alien city?
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I How to find the position of a celestial object in the sky?
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I What is the mass of all photons emitted in the universe?
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B Are White Dwarves Turning into Galactic Disco Balls?
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I What does this description mean? (two bodies orbiting each other)
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Stargazing Astronomers discover 2nd mysterious repeating fast radio burst
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I Solar Images Data: Where to Find?
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B Further collapse of Neutron Stars
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I Life on Neptune: Could Its Ocean Support Complex Life?
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I Calculating STEVE's Height from Two Photos 370km Apart
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I Moon's eccentricity, apogee and perigee
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I Formation of super-massive black holes
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I Is inflation needed to explain uniformity?
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B Another Andromeda-Milky Way "collision" question
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I Gaia Space Telescope and Lagrangian Point 2
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I Sunlight refraction at sunset at different latitudes?
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I Why Does the Sun Have an Orbital Period Like a Year?
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I Repurposing Satellites: Maximizing the Lifespan of Space Technology
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B Ideas to protect the Earth from possible asteroid impacts
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I Why do we need to unify gravity with the other three forces?
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I Collision of Milky Way and Andromeda....?
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B Standard candles in a stretching fabric of space
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A How Long To 'FreeFall' Into TON 618 From ISCO
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B Meaning of the Abbreviation CCH in Graphic
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B Discover 4 Milky Way Arms: Older Galaxies?
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I Do trojan satellites follow migrating planets?
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Stargazing Best Telescopes for $1K: Mars, Planets & Night Sky Views
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B Water - Where do you think it came from?
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Stargazing Australia's largest optical telescope
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B Searching for the Ninth Planet: Solar System Migration
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I Why do transits of Mercury only occur in May & November?
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B Interstellar Dust: What Blocks Light From Distant Galaxys?
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I Black holes with a naked singularity?
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B Why most stars seem to rotate the same direction in a galaxy?
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B Why doesn't the moon fall down if it's just a big rock?
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A Is there any astro-field that uses QM or GR frequently?
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I If a planet struck the sun, would fragments be blasted out?
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B Parallax Limitations: Measuring Distances Miles Away
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I Why isn't Mercury as red as Mars, even though it has more iron?
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I Would an exploded planet change earths orbit (see graphic)
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Stargazing What is the best Dobsonian telescope with a goto feature?
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I What factors determine the composition of a planet's atmosphere?
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I Compute the total stellar mass from a galaxy with Red Giants
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I Colliding black holes: when will linear acceleration end?
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I Gravitational field in the galaxy and Schwarzschild´s time dilation
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Insights Calculating the Spin of Black Hole Sagittarius A* - Comments
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B Does galaxy formation conserve mass and angular momentum?
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I Redshift Along Galactic Plane: Study & Research
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I A steady-state solution for the flow in the Boussineq approximation in a star
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Stargazing Telescope recommendations for watching a galaxy?
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I A question about a popular example of expansion
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B Expanding Universe - Could It Be Rotating?
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Stargazing Comet 46P/Wirtanen Visible to Naked Eye Dec 16
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I Rotation profile for radiative zone of Sun - convection
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B Does everything in space have or inherit inertia?
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I Solar spectral intensity per wavelength - frequency
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Stargazing What is the likelihood of another solar grand minimum occurring soon?
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B When light arrives at the end of space, what happens?
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B What is the Correct Formula for Calculating the Velocity of Saturn's Rings?
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B Does the Path of an Interstellar Object Curve Due to Solar System Movements?
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B Ratio of Earth-Sized exoplanets to other sizes of exoplanet?
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I Measuring the Effects of Dark Energy on Bound Objects: An Experimental Study
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I Were Population III stars powered entirely by p-p fusion?
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I Solid diprotium saturated vapour density
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Stargazing Possibility of small bodies of liquid etc
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Is Dark Matter a Dead End in Physics?
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B No low-frequency emission from Fast Radio Bursts
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B Does dark matter interact with Baryons?
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I A little doubt regarding specific angular momentum
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I Force as a function of time/space
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Do vacuum Ironing boards cause negative pressure in my Space
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B IB Extended Essay in Astrophysics
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B Barnard's Star, 6 Light-Years Away, May Have Cold SuperEarth
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Stargazing Southern hemisphere flickering orange/green star
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B Parallel Spacetimes: Matter & Antimatter Separated?
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A How to calculate Saturn's mass from Kepler's third law?
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B Magnetospheric eternally collapsing objects
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I Merging Neutron Stars: What We Know So Far
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I Calculating the Sun's core temperature?
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B Was the universe is infinitely large at the big bang?
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Accretion rate onto a WD over time (relation)
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I Why Is Jupiter's Surface Gravity Not as High as Expected?
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B Why Doesn't Earth's Strong Gravity Crush Everything on Its Surface?
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B When a star exhausted it's nuclear fuel
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I Gravity and how it starts and stops
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B What does it mean to say that "space" has a temperature?
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I Core collapse of a supernova: the "void" left by the collapsed core?
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I What areas of nano/optical research applies to astrophysics?
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