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
Stargazing Finding the Perfect Telescope for First-Time Buyers
- mouse23432
- · Replies 4 ·
Stargazing Why Do Telescopes Have Long Focal Lengths?
- pixel01
- · Replies 11 ·
Graduate Can Particle-Antiparticle Pairs Form Stable Unions?
- ffleming7
- · Replies 3 ·
Graduate Radiative transfer to space affected by atmosphere?
- Mapes
- · Replies 3 ·
Graduate Cosmological relativity theories
- cosmoboy
- · Replies 3 ·
Star Threatens Earth: Is it Real?
- engineroom
- · Replies 4 ·
Undergrad Measuring Distance: How Far Are Stars?
- iGen3
- · Replies 3 ·
Appearance of the lakes on Titan
- Meatbot
- · Replies 2 ·
High School Gravity Anomaly: What Could Be Causing It?
- Ms Music
- · Replies 2 ·
Graduate Is There a Gravitational Spectrum for Measuring Wavelengths?
- sysreset
- · Replies 3 ·
Graduate Can Information Really Be Lost in Black Holes and Our Minds?
- lazyaxus11
- · Replies 15 ·
Graduate Can an observer entering a black hole reach the end of time?
- Tuugii
- · Replies 3 ·
Who Can Help Me Customize My New MySpace Page?
- quantumdude
- · Replies 78 ·
Graduate Is the Drake Equation Still Relevant in Today's Rapidly Advancing Technology?
- fab07
- · Replies 1 ·
Graduate Carbon dust mistaken for Dark Energy all this time?
- SF
- · Replies 2 ·
Undergrad Would you expect comets to follow the ecliptic? Explain.
- kay89
- · Replies 2 ·
Graduate Birth of Planetary Systems: Starless Possible?
- TShock
- · Replies 2 ·
Undergrad Where Can I Find the Radial Velocity of the Sun Relative to Earth?
- Archduke
- · Replies 5 ·
Undergrad Galactic Structure: Do Astrophysicists See Stars Where They Are Now?
- TShock
- · Replies 1 ·
Graduate Gravity as consequence of universe expansion
- Blade Runner
- · Replies 4 ·
Undergrad Unveiling the Mystery: The Birth of Stars and the Role of Nuclear Fusion
- TShock
- · Replies 5 ·
Graduate Pioneer Anomaly: Unravelling Physics' Mysteries
- Ivan Seeking
- · Replies 65 ·
GRAVITAS GRAVITAS: Portraits of a Universe in Motion - Freely Available
- shalayka
- · Replies 5 ·
Graduate Trajectory of a Test Particle in a Semidetached Binary
- M87
- · Replies 1 ·
Undergrad Do Planets' Magnetic Fields Depend on Their Composition?
- CaptainQuasar
- · Replies 3 ·
Graduate Can objects in space appear to move backwards in time?
- Matthieu
- · Replies 3 ·
Undergrad Rotation period vs. mass of planets in solar system
- pixel01
- · Replies 7 ·
Graduate Can Negative Energy Keep Wormholes Open in the Theory of Inflation?
- hammertime
- · Replies 2 ·
Undergrad What caused the cooling of the universe?
- Alex48674
- · Replies 16 ·
Undergrad Sun rotation difference (equator/latitude/pole)?
- drewterry
- · Replies 5 ·
Graduate Fecund Universe Theory: How Different Are Baby Universes?
- hammertime
- · Replies 1 ·
Undergrad Earth's Orbit Change: Impact on Life - Will We Die?
- night_stroller
- · Replies 3 ·
Graduate What is the Wavelength of Hawking Radiation?
- Orion1
- · Replies 8 ·
Graduate How Do You Convert Monochromatic Flux Between Wavelength and Frequency Units?
- jeebs
- · Replies 1 ·
Undergrad Would Two Identical Planets Opposite Each Other Coalesce Over Time?
- pixel01
- · Replies 4 ·
Stargazing How to Buy a Telescope for Under $150?
- tictac
- · Replies 9 ·
High School Why does anything with mass have it's own gravitational field?
- _Mayday_
- · Replies 20 ·
Graduate Quantum Cosmology Evidence: String, Brane & LQC
- wolram
- · Replies 1 ·
Graduate Can Black Holes Explode Back into Normal Matter After Evaporation?
- Denton
- · Replies 2 ·
Graduate How does black hole evaporation end?
- belliott4488
- · Replies 9 ·
Graduate Stellar Evolution: Pathways & Perturbations
- Simfish
- · Replies 1 ·
Graduate The Boltzmann distribution of uniformly spaced energy levels
- corr0105
- · Replies 2 ·
Graduate Giant ropes of dark matter found in new sky survey
- SF
- · Replies 1 ·
Graduate What is the maximum gravity gradient a human can tolerate near a black hole?
- life=games&math
- · Replies 25 ·
High School Stars twinkle, but planets don't?
- fatty
- · Replies 1 ·
High School What is the difference between cosmology and astrophysics
- danzi
- · Replies 6 ·
Stargazing Total eclipse of the moon tonight.
- Jimmy Snyder
- · Replies 76 ·
Stargazing Catching the Eclipse Last Night: A Tale of Cold and Clear Skies
- NerfMonkey
- · Replies 11 ·
High School What causes gravity? Is it mass or weight?
- razerfish
- · Replies 15 ·
Undergrad Can Gravity Really Repel? Understanding Gravitons and Common Misconceptions
- shaan_aragorn
- · Replies 31 ·
Shooting the moon. did i get a space station?
- glondor
- · Replies 2 ·
Graduate How Does Solid Hydrogen Influence Astrophysics?
- jal
- · Replies 2 ·
Graduate What are the mysteries of the Big Bang and the universe's expansion?
- thinkies
- · Replies 27 ·
Graduate Are Singularities in the Universe Possible?
- Chimps
- · Replies 13 ·
High School Research Help: Get Info on 9 Planets
- Nawaf
- · Replies 3 ·
Graduate The spectrum of reflected light from a planet question.
- BERGXK
- · Replies 3 ·
Graduate Redshift Issues: Understanding the Light-Metric Coupling in Cosmology
- Emreth
- · Replies 13 ·
Graduate Hubble expansion inside a contracting supercluster
- jonmtkisco
- · Replies 24 ·
High School Ultimate fate of ISS (International Space Station)
- sysreset
- · Replies 5 ·
Undergrad What Would Happen if Earth and a Black Hole Interacted?
- pchalla90
- · Replies 10 ·
Undergrad The Milky Way is twice the size we thought it was
- SF
- · Replies 2 ·
Undergrad Protecting Craft from Solar Wind: How Far Does Our Magnetic Field Reach?
- Sheneron
- · Replies 2 ·
Graduate What causes the universe to eventually colapse?
- Alex48674
- · Replies 12 ·
Graduate Can Higgs Particles Cause Universe Expansion Due to Negative Density?
- Invariant
- · Replies 3 ·
Undergrad Human in outer space without space suit
- smallphi
- · Replies 20 ·
Graduate Dark matter and the Standard Model
- jnorman
- · Replies 17 ·
Undergrad Is Dark Matter Just Unseen Molecules?
- touqra
- · Replies 12 ·
Graduate A few questions =] (time and big bang)
- Alex48674
- · Replies 9 ·
Graduate How Can Astrophysicists Be Rescued from Mars Using Special Relativity?
- Veratule
- · Replies 8 ·
Graduate Dark energy a furphy, says new paper
- SF
- · Replies 50 ·
Is Big Bang the Funniest Show Ever?
- razerfish
- · Replies 17 ·
Graduate SETI: What would it take to monitor all probable bands.
- Taremos
- · Replies 4 ·
High School Mastering Optical Depth: Simplifying the Concept for Beginners
- O-r-i-o-n
- · Replies 10 ·
How Can We Improve Our Community Together?
- Nickelodeon
- · Replies 4 ·
Graduate What Happens to Matter Before a Black Hole Collapses?
- japam
- · Replies 5 ·
Graduate Galaxy from 700 million year old universe
- marcus
- · Replies 1 ·
Undergrad What is Vacuum Energy & How Does It Exist?
- Alex48674
- · Replies 1 ·
Graduate Could the Universe Have Expanded Immediately After the Big Bang?
- shemszot
- · Replies 18 ·
Undergrad Travelling more than Speed of light
- Habeeb03
- · Replies 8 ·
Is Humanity Truly Unique in the Universe?
- Aftermarth
- · Replies 21 ·
Do You Believe in the Big Rip Theory?
- pulsar28
- · Replies 3 ·
Graduate Is dark matter essential for understanding galaxy interactions in clusters?
- twinsen
- · Replies 3 ·
Undergrad Is there any proof that big bang actually happened ?
- Google_Spider
- · Replies 15 ·
Graduate Understanding Schwarzschild Radius Formula & Escape Velocity Calculation
- Abbas Sherif
- · Replies 1 ·
Graduate What is the radial density distribution of a neutron star?
- K.J.Healey
- · Replies 3 ·
Graduate Are there cosmological models in which Planck's constant varies?
- Peter Morgan
- · Replies 28 ·
Graduate Does Our Velocity Relative to the Black Hole Affect the Passage of Time?
- W3pcq
- · Replies 2 ·
Graduate Is the Cosmological Arrow of Time Linked to the Thermodynamic Arrow of Time?
- LTP
- · Replies 1 ·
Undergrad Understanding Wavelength, Energy, & Temperature
- Alex48674
- · Replies 2 ·
Graduate Measuring Red Shift to Confirm Hubble Flow
- wolram
- · Replies 15 ·
Graduate Planck energy is a max, is there a mimimum too?
- hurk4
- · Replies 12 ·
Graduate How to set moon free of its orbit
- yasar1967
- · Replies 16 ·
Graduate Planets & Moons Orbit: Earth, Uranus, Neptune, Jupiter, Mars, Pluto, etc.
- Super**Nova
- · Replies 1 ·
High School Is the Universe Expanding or Are Galaxies Just Moving Apart?
- gabrielh
- · Replies 4 ·
Graduate Solving Orbital Plane Alignment of Two Planets
- chronnox
- · Replies 3 ·
Graduate Are Alternative Explanations for Dark Matter Being Overlooked?
- Mephisto
- · Replies 2 ·
Undergrad Can Gamma Rays Reveal Their Source?
- wolram
- · Replies 5 ·
Graduate What Is the Universe Expanding Into?
- Ulnarian
- · Replies 88 ·
Undergrad Estimating Photon Escape Time from Center of Sun
- swickey
- · Replies 2 ·
Graduate Cosmological constant as a fluid
- EDerkatch
- · Replies 1 ·