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.
Threads
Graduate Should We Be Worried About Gravitational Waves?
- wolram
- · Replies 3 ·
High School Do we see the Sun first or its light when it rises?
- Paul Wilson
- · Replies 12 ·
Graduate Are New Ideas Important in Physics and Astronomy?
- mcgucken
- · Replies 6 ·
Graduate How to calculate Jacobians for extended Kalman filter tracking
- Ultimâ
- · Replies 17 ·
Graduate How Does the Shape of the Milky Way's Dark Halo Influence the 511 keV Line?
- wolram
- · Replies 1 ·
Is everything in the universe connected to eachother?
- PIT2
- · Replies 12 ·
Undergrad How big can red supergiants get and can they be born at that size?
- vincentm
- · Replies 4 ·
Graduate Could modern cosmology be shadows of reality like Ptolemy's epicycles?
- saltydog
- · Replies 3 ·
Graduate Expanding Universe + Rotation - Lost it somewhere
- Unknowing
- · Replies 3 ·
Stargazing Want to see an incredible solar corona photo?
- Labguy
- · Replies 2 ·
Undergrad Where do Compton Recoil Electrons come from?
- laminatedevildoll
- · Replies 1 ·
Graduate Why bodies in a particle field must move apart after collisions
- Thor
- · Replies 11 ·
High School What is the Earth's magnetic field and how does it protect us from space debris?
- cbsgorams
- · Replies 7 ·
Graduate Problem of process noise of satellite orbit determination
- whigg_wang
- · Replies 13 ·
Stargazing Which Telescope Should My School Purchase for Our New Observatory?
- GerdankenDonuts
- · Replies 1 ·
Undergrad Why do Jupiter and Saturn have atmospheric bands, and why don't Earth and Venus?
- arun_mid
- · Replies 6 ·
Undergrad Will it be hard to find planets with live plate tectonics?
- Gold Barz
- · Replies 2 ·
High School Why does Jupiter's red dot never stop?
- cbsgorams
- · Replies 2 ·
Graduate Unifying the Robertson-Walker metric
- Loren Booda
- · Replies 2 ·
High School Is matter created in the Big Bang, and are photons matter?
- aricho
- · Replies 5 ·
Stargazing Best telescope for observing planets from Toronto light pollution
- dekoi
- · Replies 7 ·
Graduate Could Venus once have resembled a gas giant?
- Andre
- · Replies 1 ·
Undergrad Why life may be rare if most stars are red dwarfs or in binary systems
- Gold Barz
- · Replies 22 ·
Graduate Searching for a Physics Book - Astronaut Dragging Personal Black Hole
- lechiffre
- · Replies 1 ·
High School Infinite Galaxy: Can Our Universe Really End?
- aricho
- · Replies 4 ·
Graduate Restricted circular 3 body problem RC3BP
- kristian jerpetjøn
- · Replies 1 ·
Graduate Are black holes just burned-out stars that don't emit photons?
- sd01g
- · Replies 1 ·
Graduate The Dark Age of the Early Universe: How Did the CMBR Reach Us?
- cyleung_2001
- · Replies 13 ·
High School Sirius - habitable orbit? (link)
- MonstersFromTheId
- · Replies 6 ·
Graduate A star located 135 degrees from the solar apex on the celestial sphere
- ek
- · Replies 1 ·
Undergrad How can empty space give off radiation from the Big Bang?
- Chemical_Penguin
- · Replies 11 ·
Reminder about Deep Impact on night of July 3
- marcus
- · Replies 8 ·
Graduate Why expansion history doesn't uniquely determine f(R) gravity
- wolram
- · Replies 6 ·
Graduate Can space-time be quantized and what would that imply?
- Physics101
- · Replies 3 ·
Undergrad Life evolving on a planet revolving a red dwarf?
- Gold Barz
- · Replies 7 ·
Undergrad Exoplanets in Habitable Zones: HD28185, HD108874, Gliese 876
- marcus
- · Replies 5 ·
Graduate Current galaxy formation in the CDM model
- hellfire
- · Replies 10 ·
Graduate Fluctuation Theorem, Big Bang Question
- Lucretius
- · Replies 1 ·
Graduate Multiverse just passes the buck on
- Chaos' lil bro Order
- · Replies 6 ·
Graduate What Are the Best Current Physics and Astrophysics Books for Graduate Students?
- cosmo_boy
- · Replies 4 ·
Graduate Origin of cosmic gamma ray background
- wolram
- · Replies 6 ·
Graduate Why is mass-energy so concentrated at all scales?
- Ratzinger
- · Replies 4 ·
High School Balck hole within 20 light years?
- rollingstone
- · Replies 9 ·
Graduate Acceleration At The Event Horizon
- mrjeffy321
- · Replies 29 ·
Undergrad Why is the night sky dark if there are infinitely many stars?
- lwymarie
- · Replies 10 ·
High School Earth's 'bigger cousin' detected
- Math Is Hard
- · Replies 16 ·
Undergrad Drake Equation: Estimating Life Supporting Planets & Detecting Life
- wolram
- · Replies 25 ·
Graduate Testable predictions of alternative cosmology models
- wolram
- · Replies 17 ·
Graduate A little direction regarding dark energy.
- Slimchandi
- · Replies 4 ·
High School How does other galaxies differ from out own?
- MightyMeanie
- · Replies 5 ·
High School What to see from Earth during Deep Impact's comet collision?
- chief
- · Replies 5 ·
Undergrad Is DST Causing Confusion in Determining UTC for Historical Events?
- kepler
- · Replies 8 ·
High School What is the distance to the nearest star?
- MightyMeanie
- · Replies 7 ·
High School Texts on Introduction to Astronomy/Cosmology
- dekoi
- · Replies 3 ·
Graduate Moon-Earth Slingshot: Launching Craft to Other Solar Objects
- quetzalcoatl9
- · Replies 10 ·
Network to connect television satallite dishes
- pbj59
- · Replies 4 ·
High School What Can You Actually See in the Asteroid Belt with the Naked Eye?
- MonstersFromTheId
- · Replies 4 ·
Stargazing How do I properly set up a telescope mount for accurate tracking and viewing?
- Integral
- · Replies 2 ·
High School Why Variable Stars Change Magnitudes Periodically
- tmwong
- · Replies 2 ·
Graduate Dark Matter need not be for a stable Universe Sez'an'amateur
- timestill
- · Replies 10 ·
Stargazing Eyepiece produces blurry image, removing it sharpens focus
- Felix83
- · Replies 7 ·
Graduate Cosmology: the scinece on the universe.
- cosmo_boy
- · Replies 4 ·
Graduate Black hole confusion Not uncommon, is it?
- "Requiescat in pace"
- · Replies 2 ·
Graduate Is There Really an Ocean Beneath Europa's Ice?
- MonstersFromTheId
- · Replies 4 ·
Undergrad Wien's law and black body emition
- Gabokappa
- · Replies 5 ·
Is Our Galaxy One of the Oldest?
- Gold Barz
- · Replies 6 ·
Graduate Can Dark Matter and Dark Energy Unify the Expansion of the Universe?
- wolram
- · Replies 2 ·
Graduate Moffat's modified gravity model fit to galaxy rotation curves
- marcus
- · Replies 11 ·
High School Explosions in Space: No Use in Space?
- kurushio95
- · Replies 4 ·
Graduate How Was the Multiverse Formed According to Michio Kaku?
- dm84z28
- · Replies 2 ·
Graduate Vilenkin's Proposal: Can Absolute Nothingness Exist?
- agnostictheist
- · Replies 2 ·
Graduate Revisiting the Controversial Cosmic Censorship Hypothesis
- touqra
- · Replies 2 ·
High School Does nightime sky face outer or inner galaxy?
- Moonrat
- · Replies 7 ·
Graduate What is the Meaning of Scale Radius in Spiral Galaxies?
- minase
- · Replies 3 ·
Virtual Observatory: Cruise the Heavens from Your Recliner
- Chronos
- · Replies 4 ·
Graduate What would cause a black hole to explode?
- Vast
- · Replies 5 ·
Stargazing Is There a Way to View the Night Sky Without Leaving Your Computer?
- minase
- · Replies 1 ·
Graduate Reduced Circumference: Schwarzschild vs Kerr Metric
- Moore1879
- · Replies 1 ·
Graduate Objections to the Big Bang theory from Eric Lerner and Metaresearch
- Theatre Of Fate
- · Replies 14 ·
Testability thread is great (keeping comment/discussion out works, too)
- marcus
- · Replies 13 ·
Graduate What Happens If You Stick Your Hand Inside a Black Hole's Event Horizon?
- hedons
- · Replies 13 ·
Undergrad Quasars,white dwarf and neutron stars
- sage
- · Replies 8 ·
Graduate How Would the Universe Appear if Light and Gravity Were Instantaneous?
- Loren Booda
- · Replies 4 ·
Graduate My thoughts on Space-Time and Matter-Gravity
- Physics101
- · Replies 4 ·
Graduate Do Black Holes Violate the Laws of Thermodynamics?
- pakoppan
- · Replies 7 ·
Graduate Neutron diffusion and nucleosynthesis
- wolram
- · Replies 2 ·
Graduate Total Eclipse of the Sun: 40s Before Alignment
- Arctic Fox
- · Replies 2 ·
Graduate Can artificial black holes be created in reality?
- matness
- · Replies 1 ·
Graduate A solid surface model of the sun.
- Michael Mozina
- · Replies 1 ·
How many alien civilizations are existing in the Milky Way
- Gold Barz
- · Replies 22 ·
Graduate Is the Sun's Surface Actually Solid and Electrically Conductive?
- Michael Mozina
- · Replies 3 ·
Undergrad How is the age of the universe calculated?
- TheSpecialist
- · Replies 2 ·
Graduate Null Energy Condition: What Is It?
- touqra
- · Replies 1 ·
Graduate Could Light from Distant Stars Be Doppelgangers Due to Gravitational Lensing?
- c_helm@yahoo.com
- · Replies 1 ·
Graduate Random walk and universal expansion
- Loren Booda
- · Replies 2 ·
Graduate Is the Big Bang Theory Really Wrong?
- pmb_phy
- · Replies 11 ·
Graduate Time to reach thermal equilibrium with radiation
- hellfire
- · Replies 2 ·
Graduate Mass transfer timescale in neutron star binary systems
- gonzo
- · Replies 3 ·
Stargazing Cost-effective digital camera and telescope
- dekoi
- · Replies 3 ·
Graduate BAre Galaxy Clusters Altering the Primordial Echoes from the Big Bang?
- wolram
- · Replies 6 ·