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 Is the Universe's age 13.7B years in a particular frame?
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B The Guardian's Bad Astronomy
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22
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287
B Saturn has 145 moons!
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15
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462
B Sunlight reflection on planets
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2
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95
B Supernova in Pinwheel Galaxy!
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4
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178
B How can the Universe be flat? Ridiculous
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13
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192
B At what distance would a Venus-like planet have a HZ temperature?
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14
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264
B Night Sky of Alpha Centauri: Sol as a Bright Star
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15
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310
B How bright is the Sun compared to the sky?
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17
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329
B Glimpsing Orion's Setting in the Western Sky
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5
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191
B The human body and the Sun
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3
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164
B What's a good website for aurora forecasts?
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5
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199
B Ken's Constellation Query: Viewing Same Constellation in AUS & SA
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7
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413
B Exoplanet TOI-4603 b, ~13x Jupiter mass, ~1.04 Jupiter diameter
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22
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631
B Ultramassive Black Hole (UMB), 30 billion solar masses?
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4
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486
B Are the stars that we see in constellations within the Milky Way galaxy?
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31
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2K
B Circumgalactic Black hole imaged by the Hubble Space Telescope
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280
B AI Enhanced image of M87 black hole
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2
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245
B Jupiter from James Webb
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2K
B How many astronomers use JWST data?
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1
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247
B Can anyone suggest a good website to buy astronomy equipment?
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5
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326
B Vulpecula, pulsars and neutron stars
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10
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483
B Uracil found in carbonaceous asteroid
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7
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429
B Why do people not notice the equinox when it happens?
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20
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669
B Supermassive stars
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5
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1K
B Gamma-Ray Burst GRB221009A
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12
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1K
B U.S. Solar Eclipses - Oct. 14, 2023 (Annular) & Apr. 08, 2024 (Total)
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5
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335
B Map of M87 Galaxy & Universe: Find & Explore Here!
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5
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524
B 'Universe Breaking' results from JWST -- What does this mean?
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B Deriving the Approach Velocity of Meteorites
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6
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866
B Forming Stars/ Brown Dwarfs by photo-erosion
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480
B Why is this JWST paper a cause for 'Panic'?
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2K
B Can a T-tauri star degenerate into a Brown dwarf?
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B Formation of Brown Dwarfs in filaments?
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499
B Who was the first person to recognize the stars as very distant suns?
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12
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1K
B What is the best source for this star data? (M44 Beehive Cluster)
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11
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638
B Hot white dwarfs and pre-white dwarfs discovered with SALT, MNRAS
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2
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746
B What is the “Unknown physics” of the new Kilonovae explosion?
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17
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696
B Planetary Orbits - Elliptical or Wavelike?
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10
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899
B Moon during autumnal equinox
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4
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825
B The green comet is just a weak smudge now
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4
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640
B Gamma Ray Burst / Jet Questions
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6
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670
B Are the stars of the constellations stationary?
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8
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716
B Question regarding supermassive black holes in the early Universe
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1
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655
B Does the Nemesis star exist?
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6
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779
B Meteorite identification help please
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9
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908
B Why isn't there an effort to name non-stellar celestial objects?
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16
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822
B Data needed - Related bodies and their stats
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5
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808
B Projected linear separation between companion stars
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14
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978
B Is there a theoretical size limit for a planet?
2
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3K
B Could Dark Matter/Energy be the byproduct of annihilation?
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4
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B Exploring Attitude Control of Satellites & ISS
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5
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726
B Digging Mars for Air Pressure
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17
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875
B How did Earth get so far away from other galaxies?
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12
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807
B Alpha Centauri Orbits to Scale?
2
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47
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2K
B Meteor detection/prediction: One over Toronto, ON, Canada
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5
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864
B Neptune, my beauty?
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936
B On the Doppler Effect
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707
B Hydrostatic pressure in a bottle of water on ISS
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21
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1K
B Communication Options With Future Deep Space Probes?
2
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3K
B Would the Giant Arc be visible from a hypothetical exoplanet?
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11
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1K
B Ivuna meteorite from edge of solar system to Tanzania?
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8
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1K
B Would light travel in a circle at the edge of the observable Universe?
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19
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1K
B How hot is the Sun in space? (James Webb related)
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25
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2K
B Could there be macro objects out there that convert energy to mass?
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15
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947
B Possible to see the moons of Jupiter/Saturn with decent set of binoculars?
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20
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4K
B The Oblate Earth
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5
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996
B Can gravitational force have influence on objects at infinitely long distances?
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3
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884
B Elbert Another Forgotten Woman who helped advance Science
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3
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B Distance of Stars / Size of the Universe calculation
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6
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1K
B Neutron Star Merger Shrapnel
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8
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940
B Waning Gibbous Moon Tilt
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2
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886
B Degeneracy pressure
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2
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1K
B Hexagonal Craters
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13
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1K
B Exploring the History of Calculating Solar System Body SGPs
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3
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1K
B Why are all craters round?
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27
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B 2 time dimensions -ish
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13
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B So what's your go-to method to locate M31 (Andromeda Galaxy)?
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13
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1K
B Nodal precession
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22
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B Spatial Expansion -- Coincidence?
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6
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954
B What would the planets look like in real life?
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17
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1K
B Amazing Ringing Stars
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6
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964
B The value of the standard acceleration due to Earth's gravity
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10
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1K
B Could a black hole just be a planet?
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6
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996
B What does relativity say about wormholes?
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11
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B Effect of JWST mirror damage on final images
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B Question about deep space pictures
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3
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B SOFIA IR Observatory in the Southern Sky
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B Mars Probe gets Windows 98 Update, after 19 years
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6
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B Where can I find information about Population III stars?
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2
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B Is it possible for a giant star to have a black hole inside it?
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B How often do you re-acquire dark and bias frames?
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1
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680
B Anyone heard of Stellina?
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1K
B Seeking Astronomy Tables
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5
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743
B Has there been no update to Allen's Astrophysical Quantities since 1999?
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614
B Evolution of planetary system around a white dwarf
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642
B Sun contains more oxygen, silicon and neon than previously thought
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5
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792
B Derivation for Aphelion and Perihelion Distances
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3
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741
B Scope Eyepiece diameter for old eyes
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1
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532
B Event Horizon Telescope, Milky Way supermassive black hole stream
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8
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734

Astronomy

Welcome to the Astronomy forum!

Astronomy generally refers to the act of observing things (be that stars, galaxies or whatever) which, coupled with astrophysics, aims to understand those things for their own sake. The aim is to learn about the stars, galaxies or planets etc.

Astronomy, both observational and theoretical (and now also experimental!) is about what is going on in the universe that we can see now, or extrapolate to short times (~a billion years) in the past or future.

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