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
Undergrad Travelling more than Speed of light
- Habeeb03
- · Replies 8 ·
Is humanity the only intelligent life in the universe?
- Aftermarth
- · Replies 21 ·
Do You Believe in the Big Rip Theory?
- pulsar28
- · Replies 3 ·
Graduate Does dark matter affect galaxy movements in clusters and between galaxies?
- twinsen
- · Replies 3 ·
Undergrad Is there any proof that big bang actually happened ?
- Google_Spider
- · Replies 15 ·
Graduate Schwarzschild radius formula and escape velocity paradox
- 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 How does cosmic expansion decrease light's energy and 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 Why does Earth's moon change orbital nodes while other moons orbit their planet's equator?
- 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 Do gamma rays carry enough information to prove their source?
- wolram
- · Replies 5 ·
Graduate If the universe is expanding, what is it 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 ·
Graduate Neutron degenerate matter as dark matter
- jal
- · Replies 4 ·
Undergrad Creating a Planet of Sky and Clouds: Is it Possible?
- Nostredame
- · Replies 3 ·
Graduate Reconciling the Paradox of Age and Size in a Finite Universe
- Quincy
- · Replies 9 ·
Graduate Does Hubble expansion apply to the Moon's orbital distance?
- John Richard
- · Replies 3 ·
Undergrad Is it possible to create Orbital construction yards for Spaceships?
- Aftermarth
- · Replies 6 ·
What Would Happen if the Earth's Axis was Vertical to the Solar System?
- Ulysees
- · Replies 7 ·
Graduate When a supernova occurs is it expected that the gravity wave
- wolram
- · Replies 3 ·
High School Can Low-Cost Methods Be Used to Launch Objects into Orbit?
- concious
- · Replies 3 ·
Graduate WMAP 2006 - Mainstream model parameters
- Garth
- · Replies 3 ·
Undergrad Pulsars vs brown dwarves and M45 blue giants cluster
- Aftermarth
- · Replies 1 ·
Undergrad How did the Moon gain its orbital speed around Earth?
- yasar1967
- · Replies 7 ·
Stargazing What Size and Material Should I Use for My Refractor Telescope Tube?
- purina
- · Replies 1 ·
Graduate The art to become special and a bounce
- hurk4
- · Replies 1 ·
Graduate (problem) Spherical trigonometry and star declination
- giann_tee
- · Replies 4 ·
Stargazing Can we see human history through a telescope?
- earthling
- · Replies 5 ·
Graduate Dimensional analysis on Luminosity
- BERGXK
- · Replies 6 ·
Stargazing Optic Quality and Useful Magnification of the Orion Skyview Pro 6 Telescope
- yiuscott
- · Replies 17 ·
Graduate How Does Heat Transfer Occur in Neutron Stars?
- physicophile
- · Replies 1 ·
Stargazing Can i use a watch glass as a primary mirror of dobsonian telescope?
- josue2503
- · Replies 2 ·
Undergrad Applying Runge-Kutta(RK4) method to planetary velocity
- StillmatikX
- · Replies 9 ·
High School Can Dark Matter and Black Holes be Associated in Earth's Rotation?
- thinkies
- · Replies 55 ·
Graduate Which conserves energy better? Expanding space or Shrinking matter?
- kmarinas86
- · Replies 4 ·
Graduate How Could the Big Bang Avoid Being a Black Hole?
- darkfall13
- · Replies 6 ·
Stargazing Magnification of dobsonian telescope
- josue2503
- · Replies 1 ·
Graduate Calculating Optical Interferometry Telescope Resolution
- jumpjack
- · Replies 2 ·
Undergrad Evidence of the age of the universe
- W3pcq
- · Replies 18 ·
Undergrad The redshift is how far/long ago?
- shotgun
- · Replies 8 ·
Undergrad Rebuttle of Black hole arguments
- rubecuber
- · Replies 8 ·
Graduate Scientists Say Time is Slowing Down
- SF
- · Replies 2 ·
Graduate Black Hole Temperature and Entropy
- George Jones
- · Replies 5 ·
Undergrad 3D visualizations of analemma formation
- Himanshu
- · Replies 1 ·
Stargazing Primary mirror for dobsonian telescope
- josue2503
- · Replies 1 ·
Undergrad How to graph right ascension and declination on a globe
- Commodore
- · Replies 7 ·
Graduate Is the whole Universe expanding, or just the Observable Universe?
- astrocat
- · Replies 4 ·
Graduate Is Part of the Observable Universe Moving Faster Than Light?
- poeteye
- · Replies 7 ·
Graduate Why isn't it possible that gravity is repulsive at long distances?
- Chronothread
- · Replies 8 ·
High School Is Dark Matter a solid, gas or liquid?
- tycon69
- · Replies 23 ·
Graduate Is the cosmological prinicple wrong? Is Big Bang wrong?
- quantum123
- · Replies 65 ·
High School What Is the Time Scale for the Heat Death of the Universe?
- sadhu
- · Replies 8 ·
Undergrad Altitude and Azimuth of the Sun on the Summer Solstice at the Tropic of Cancer
- Commodore
- · Replies 4 ·
Graduate The magnetic field as dark matter
- kmarinas86
- · Replies 8 ·
Graduate Can Two Black Holes Really Collide, Even If They Were Once Stars?
- wolram
- · Replies 8 ·
Graduate Theoretical Resolution of Hubble
- Space259
- · Replies 5 ·
Graduate Final temperature in a de-Sitter universe
- hellfire
- · Replies 10 ·
High School Understanding Life Support Systems
- davo
- · Replies 11 ·
Graduate Proving Expanding Black Body Problem: A Question
- zdream8
- · Replies 4 ·
Undergrad Apparent Magnitude of planets as seen from earth
- RiChY
- · Replies 2 ·
Graduate Does the Hubble constant describe expansion rate or acceleration?
- heliocentricprose
- · Replies 25 ·
Stargazing Question on Refractor Telescope
- willingtolearn
- · Replies 6 ·
Undergrad Spectral and Luminosity Classification
- deathsfriend
- · Replies 2 ·
High School Stargazing 101: Adjusting for Hemisphere
- txlabrat13
- · Replies 1 ·
Graduate Accelerating Motion in Space: Virtual Particles?
- Joanna Dark
- · Replies 1 ·
Graduate Orbit Semimajor Axis and Eccentricity after increasing V
- ryank614
- · Replies 2 ·
Graduate Extra-galactic meteor observed by Russian scientists
- neutrino
- · Replies 4 ·
Graduate Neutron degeneracy pressure and electron degeneracy pressure
- CJames
- · Replies 7 ·
Undergrad Calculating sidereal months from synodic periods for fictional moons
- Super**Nova
- · Replies 5 ·
Undergrad What makes a galaxy rotate and does it depend on rotational gas?
- wolram
- · Replies 12 ·
The creation of our solar system?
- pixel01
- · Replies 1 ·
High School Books on the infinity of space and nature of time
- mistersmith
- · Replies 1 ·
Undergrad Why 24 hours for right ascension?
- ivan
- · Replies 9 ·
Graduate Traces of ‘Mythical’ Cosmic Strings Found
- SF
- · Replies 1 ·
Graduate LIGO detects no gravitational waves from gamma ray burst
- SF
- · Replies 6 ·
Graduate A Galaxy Beyond Gravity and the Hubble Flow
- wolram
- · Replies 6 ·
Undergrad August 2006 article promoting MOND
- SF
- · Replies 1 ·
Graduate Newbie to this forum with a silly question
- Matthieu
- · Replies 14 ·
Graduate Explanation of changing particles within a blackhole
- only_huce
- · Replies 1 ·
Stargazing How to Make a Parabolic Mirror for a Telescope at Home?
- josue2503
- · Replies 2 ·
First pictures From Mercury in 30 yrs.
- Janus
- · Replies 2 ·
High School What Are the Best References for Exoplanet Data and Information?
- FUNKER
- · Replies 3 ·
Undergrad The ecliptic planes of the Milky Way and the solar system
- pixel01
- · Replies 4 ·
Undergrad Which mathematics should I study before starting an astrophysics degree?
- Phalid
- · Replies 3 ·
Graduate Is String Theory Consistent with MOND and TeVeS?
- H.M. Murdock
- · Replies 1 ·
Stargazing Want to run out and buy a better telescope
- Enigma007
- · Replies 2 ·
Stargazing Meade 10" Starfinder EQ Telescope - Buy Now on eBay
- GreenLRan
- · Replies 3 ·
High School Questions About Space: Is Travel Circular? Can You Reach Big Bang Light?
- _Mayday_
- · Replies 4 ·
Undergrad Kepler's Law: Error Analysis & Mass of Earth
- swickey
- · Replies 3 ·
Undergrad Why Don't We Feel the Universe's Expansion?
- Manicwhale
- · Replies 3 ·
Undergrad How do i find out how much energy a 20solar M BH would radiate given that
- rubecuber
- · Replies 2 ·