Astronomy, Astrophysics, Cosmology Forum

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Join in expert discussion on the topics of Astronomy, astrophysics and cosmology. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Graduate Particle horizon in Lemaître model
  • EhsanZ
  • · Replies 1 ·
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High School Martian Pole Star: Same as Earth's?
  • m~ray
  • · Replies 6 ·
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6
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4K
Undergrad Are Black Holes Proven or Just Theoretical Constructs?
  • stglyde
  • · Replies 36 ·
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36
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10K
Graduate Can Space Warp Independently of Mass?
  • Buckethead
  • · Replies 13 ·
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13
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5K
Undergrad Why the universe is expanding faster and faster
  • enricfemi
  • · Replies 49 ·
2
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49
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29K
Graduate What is the total energy of the universe?
  • physixer
  • · Replies 5 ·
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5
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4K
Undergrad Are supermassive black holes just big stars?
  • Singlecoil
  • · Replies 11 ·
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11
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4K
Graduate Can the Universe's Path be Definitively Determined?
  • jam.muskopf
  • · Replies 16 ·
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16
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4K
Graduate What Existed Before the Big Bang?
  • Willis666
  • · Replies 21 ·
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21
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6K
Undergrad Is Black Hole Gravity Strong Enough to Crush Earth into a Watermelon?
  • 3112100000
  • · Replies 2 ·
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4K
High School What Causes Sunspots and How Do They Affect Solar Brightness?
  • ahaanomegas
  • · Replies 6 ·
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6
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5K
Undergrad Can Scientists Capture Images of Distant Stars Like Betelgeuse?
  • thetexan
  • · Replies 6 ·
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6
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3K
Undergrad Neutron star and white dwarf material
  • mathman
  • · Replies 9 ·
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9
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4K
Undergrad If you leave Earth traveling at .01c can you reach Saturn in 6 days?
  • cjackson
  • · Replies 2 ·
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3K
Graduate What Causes the Expansion of the Universe?
  • wolram
  • · Replies 9 ·
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9
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8K
Supernova SN 2011fe Still Alive and Kicking
  • Drakkith
  • · Replies 10 ·
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Graduate The resulting mass of the remnant of a core-collapse SN
  • bendaten
  • · Replies 10 ·
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10
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4K
Undergrad I think the universe is slowing down not speeding up
  • Vincent Neave
  • · Replies 12 ·
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12
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5K
Graduate Causal entropic principle / entropic principle
  • dmtr
  • · Replies 1 ·
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1
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7K
Graduate Black Holes: Falling in and Looking out?
  • FGLC Nate
  • · Replies 10 ·
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10
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5K
Graduate Data to derive Hubble's constant
  • Bojje
  • · Replies 2 ·
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2
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4K
Graduate What is the current understanding of the galactic magnetic field?
  • korben dallas
  • · Replies 16 ·
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16
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7K
Undergrad Could Telescopes Ever Capture Detailed Images of Exoplanet Surfaces?
  • hiddenvariabl
  • · Replies 19 ·
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19
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11K
High School Why is There Space in the Universe?
  • mgervasoni
  • · Replies 24 ·
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24
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14K
Graduate Did Matter Really Exceed the Speed of Light During the Big Bang?
  • studentxlol
  • · Replies 2 ·
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2
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3K
Graduate Black Hole Temperature: Stephen Hawking Equation & Calculation Results
  • sabanation12
  • · Replies 6 ·
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6
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9K
High School Kepler22b-first exoplanet found in hab-zone of sun-like star
  • marcus
  • · Replies 37 ·
2
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37
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15K
Undergrad AU and the Circumstellar Habitable Zone
  • Hanne
  • · Replies 2 ·
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2
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3K
Graduate Surviving Space: The Impact of Hemoglobin Levels on Human Body in a Vacuum
  • BrigetJameson
  • · Replies 6 ·
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3K
Undergrad What Happens When Two Black Holes Collide?
  • jayaramas
  • · Replies 6 ·
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6
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4K
Graduate Time dialation when viewing across the universe
  • DarkMatterHol
  • · Replies 29 ·
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10K
Stargazing Eclipse of the Moon from Sydney, Australia 10 Dec 2011 video
  • baz201
  • · Replies 2 ·
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2
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3K
Graduate Universal mass than a proton?
  • megacal
  • · Replies 5 ·
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5
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3K
Graduate Movement in time/movement in space
  • foolishwun
  • · Replies 1 ·
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1
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3K
Graduate Mars Atmosphere And Magnetic Field
  • mjacobsca
  • · Replies 5 ·
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5
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6K
High School SECCHI Uncovers What? Near Mercury
  • DoggerDan
  • · Replies 2 ·
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2
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4K
Graduate How fringe are alternatives to the Big Bang Theory?
  • Mooky
  • · Replies 11 ·
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11
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5K
Graduate Influence of metallicity on effective temperature of star
  • Anne-Sylvie
  • · Replies 4 ·
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4
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7K
Undergrad Highest Star Core Temperature: Does Size Matter?
  • goldsax
  • · Replies 8 ·
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8
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19K
Graduate Relativistic effects on planetary shear [tidal forces]
  • nearc
  • · Replies 3 ·
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3
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3K
Graduate Is Dark Energy Necessary for the Acceleration of the Universe's Expansion?
  • gregtomko
  • · Replies 131 ·
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23K
High School Can the Mass of a Black Hole Bend Time and Space?
  • Bogrune
  • · Replies 5 ·
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5
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4K
High School How realistic are the colors that we see in pictures of galaxies/nebulas?
  • Vicbramwell
  • · Replies 11 ·
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11
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26K
Stargazing Ever wonder what happens during a lunar eclipse?
  • Jimmy Snyder
  • · Replies 20 ·
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20
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4K
Graduate What Would It Take to Travel to a Parallel Universe?
  • Mind Bender
  • · Replies 3 ·
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3
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4K
Undergrad S.O.L vs The Big Bang: Speed of Expansion
  • richardg1987
  • · Replies 25 ·
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25
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6K
Graduate Is there a discrepancy between the Oldest Galaxy and Age of the Universe
  • Tanelorn
  • · Replies 15 ·
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15
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5K
Graduate Dark Energy in the Zero Energy Universe
  • 7icarus7
  • · Replies 4 ·
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4
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5K
Graduate Is There a Ground Zero for the Big Bang?
  • Charles Brown
  • · Replies 11 ·
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11
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5K
Graduate Neutron Star Below the Chandrasehkar Limit - Properties & Atomic Matter?
  • fhqwgads2005
  • · Replies 15 ·
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15
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5K
Graduate What happens when a black hole evaporates?
  • Willis666
  • · Replies 1 ·
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1
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2K
Undergrad Half Light Speed Probes: See What Earth Sees
  • Mikec_vet
  • · Replies 3 ·
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3
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3K
Graduate Dark matter vs. modified gravity?
  • alemsalem
  • · Replies 2 ·
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2
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4K
Graduate Could Our Universe Be Inside a Black Hole?
  • Vincent Neave
  • · Replies 6 ·
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6
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3K
Undergrad Impact & Gravitational Effects of Asteroids/Comets on Moons Orbit
  • MaverickBlue
  • · Replies 8 ·
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3K
High School Having trouble understanding how We are made from a supernova?
  • nukeman
  • · Replies 12 ·
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11K
Graduate Time variable of space-time at the end of universe
  • VaibhavP
  • · Replies 7 ·
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3K
High School Few Question from a Naive Astro enthusiast
  • galisuman
  • · Replies 6 ·
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6
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3K
Fascinated by the space,stars,sky
  • shankar93
  • · Replies 3 ·
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3
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4K
Graduate Astronomical spectroscopy and doppler shift.
  • ViolentCorpse
  • · Replies 9 ·
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9
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5K
Undergrad Problem understanding NBody simulation physics
  • Bekos
  • · Replies 3 ·
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3
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4K
Graduate Find the Lead Pursuit Line to Reach a Planet
  • GrantB
  • · Replies 3 ·
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3
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3K
Undergrad Computer simulations of expanding space
  • nearc
  • · Replies 5 ·
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5
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3K
Graduate How intimate are the rays of light?
  • nihilius
  • · Replies 5 ·
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5
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3K
Why do people ask why life exists?
  • fomenkoa
  • · Replies 11 ·
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11
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11K
Undergrad The age of the universe vs. the speed of light
  • cisco kid
  • · Replies 36 ·
2
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36
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9K
What are some recommended Cosmology books?
  • The Lobster
  • · Replies 4 ·
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4
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4K
Undergrad Does Our Milky Way Stir Up Solar System Collisions?
  • really.
  • · Replies 1 ·
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1
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3K
Graduate Black hole vs. Black hole, who wins?
  • Chaos' lil bro Order
  • · Replies 44 ·
2
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44
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26K
Undergrad What Causes Time Dilation on Mars?
  • goodabouthood
  • · Replies 11 ·
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11
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7K
Undergrad Could a Black Hole Be 10 Billion Times Larger Than the Sun?
  • Passionflower
  • · Replies 1 ·
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1
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2K
Graduate The expansion of the universe and gravity: One question.
  • McCartney
  • · Replies 6 ·
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6
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4K
Graduate String Theory and Eternal Inflation
  • dm4b
  • · Replies 14 ·
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14
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4K
Graduate The Blushing Face of Saturn: Radiance, Luminosity & Habitable Zone
  • writtenword
  • · Replies 2 ·
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2
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3K
Undergrad Could the Big Bang Have Created a Black Hole?
  • mangog
  • · Replies 3 ·
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3
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3K
Stargazing Is the Hubble Telescope Obsolete?
  • Thecla
  • · Replies 10 ·
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10
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9K
Graduate Can a New Theory Accurately Predict the Composition of the Universe at Any Age?
  • Dynamotime
  • · Replies 38 ·
2
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9K
Graduate Just a Little Mind Game re: Superluminal Neutrino Velocities
  • BadBrain
  • · Replies 23 ·
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23
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6K
Graduate Deriving a scale factor expression for FLRW model
  • Rettaw
  • · Replies 2 ·
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2
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3K
Undergrad Using Rspec to Interpret Stellar Spectra
  • Raxas
  • · Replies 4 ·
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4
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3K
Undergrad How Were Daily and Annual Cycles Explained Before Copernicus?
  • Front Office
  • · Replies 2 ·
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2
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3K
Are black holes really the cookie monsters of the universe?
  • clearwater304
  • · Replies 2 ·
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2
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2K
Do you think astronomy is a useful science?
  • Athalus
  • · Replies 23 ·
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23
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18K
Graduate What is the rate at which the CMBR is cooling?
  • PhoenixKnight
  • · Replies 6 ·
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6
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4K
Graduate Computation of Solar Position and Velocity Vectors (Meteor Orbit)
  • solarblast
  • · Replies 1 ·
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1
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2K
Graduate Question: What is the Universe Expanding Into?
  • Ossama
  • · Replies 35 ·
2
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35
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8K
Undergrad First post ever. Be Kind. Solar orbit questions
  • Johio
  • · Replies 8 ·
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8
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3K
Graduate Inflation and expansion of spacetime
  • stglyde
  • · Replies 2 ·
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2
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3K
Graduate Dark energy <=> negative energy?
  • Amir Livne
  • · Replies 3 ·
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3
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7K
Bill O'Reilly the master of Astronomy?
  • EternityMech
  • · Replies 6 ·
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6
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3K
Graduate About the hot gas around NGC 4555
  • Buckethead
  • · Replies 2 ·
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2
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2K
Graduate Anyone have access to the 1955 Nautical Almanac?
  • solarblast
  • · Replies 3 ·
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3
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2K
Graduate How Can I Solve a Two-Body System Using Kepler's First Law?
  • cp05
  • · Replies 11 ·
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11
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5K
Graduate Unraveling the Mysteries of Black Holes and the Big Bang
  • Dave Apsey
  • · Replies 27 ·
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27
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7K
Graduate Could the Universe Be Rotating Instead of Expanding?
  • wildwill
  • · Replies 4 ·
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4
Views
3K
High School Can we get caught by surprise by an asteroid?
  • bostonnew
  • · Replies 13 ·
Replies
13
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6K
Undergrad The Universe may eventually stabilize?
  • Mind Bender
  • · Replies 11 ·
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11
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3K
Graduate How is my short essay so far? Accurate?
  • Carnivroar
  • · Replies 7 ·
Replies
7
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3K
Graduate Is the Mass of Super-Massive Black Holes Factored into Dark Matter Calculations?
  • tanzanos
  • · Replies 47 ·
2
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47
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14K
Graduate Is the universe an axiomatic system?
  • epkid08
  • · Replies 1 ·
Replies
1
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4K