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 Could Black Holes Be Portals to Other Universes?
- bondinthesand
- · Replies 6 ·
Graduate Could Minor Density Variations in the Universe Solve the Flatness Problem?
- keepitmoving
- · Replies 2 ·
Graduate Expected sound of colliding black holes
- varsha
- · Replies 9 ·
Undergrad Redshift of Far Galaxies: What Causes It?
- JD88
- · Replies 4 ·
Undergrad Difference between a red/blue shifted object and one in rest.
- Cipz
- · Replies 7 ·
High School What is the composition of a gas giant's atmosphere?
- vanesch
- · Replies 2 ·
Graduate Is the Higgs field the substance that fills the universe?
- Simple10
- · Replies 5 ·
Undergrad Do gravitational waves have varying frequency, amplitude and energy?
- fropome
- · Replies 27 ·
Graduate Is the physics within the Solar system really understood?
- Garth
- · Replies 7 ·
Graduate What Units Should I Use to Calculate Planetary Orbit Time?
- lagwagon555
- · Replies 2 ·
High School Can You Move a Spaceship By Running and Jumping In It?
- Pheo1986
- · Replies 9 ·
High School Is the moon closer or further away to us than predicted by Newton
- seasnake
- · Replies 6 ·
Graduate Does a flat universe require an edge?
- $id
- · Replies 3 ·
Undergrad Does Light Slow Down During Long-Distance Space Travel?
- eha
- · Replies 1 ·
Undergrad What is the relation between redshift and absorption lines in galaxies?
- nietzsche
- · Replies 2 ·
High School Big Bang location, expansion, and fundamental questions
- lavand
- · Replies 6 ·
Graduate Was there a 'birth of gravity'?
- Rymer
- · Replies 42 ·
Graduate Could anything in the solar system survive the sun becoming a red giant?
- flatmaster
- · Replies 11 ·
High School Are there any objects between Mercury and the Sun?
- Richard87
- · Replies 1 ·
Graduate Neutron stars and blue/red shifting
- JRPB
- · Replies 4 ·
High School Viewing Earth from the Moon - Would it Stay in One Spot?
- KevinMWHM
- · Replies 6 ·
Stargazing Can I learn to use a telescope alone with no experience, and what can I buy for $440?
- Wattever
- · Replies 6 ·
Graduate How Does Gravity Influence the Big Crunch Hypothesis?
- wolram
- · Replies 1 ·
Undergrad Energy time relationship from an observer in space
- Entropee
- · Replies 2 ·
High School Has Jupiter Been Bombarded by Another Object?
- Astronuc
- · Replies 21 ·
Stargazing How do space telescopes detect non-visible light?
- modulus
- · Replies 4 ·
Graduate Red shift distance relationship and dark energy
- hkyriazi
- · Replies 14 ·
Graduate Is There an Upper Limit to Planetary Core Density?
- Loren Booda
- · Replies 8 ·
Graduate Proof of planetesimals for asteroid belt?
- zankaon
- · Replies 2 ·
Graduate Matter and antimatter black holes colliding: annihilation or merger?
- Herbascious J
- · Replies 6 ·
Graduate Calculating Distance to Cefeide Star w/ Stellar Extinction
- Sux
- · Replies 3 ·
Undergrad If light cannot escape a black hole, how does it emit Hawking radiation?
- cragar
- · Replies 7 ·
Graduate Question: How does gravity affect the speed of light in a black hole?
- boredjavi
- · Replies 3 ·
Graduate Interpreting Negative Dark Energy Density in the Expanding Universe
- zeebo17
- · Replies 2 ·
ISS Toolbag visible with the naked eye now
- Count Iblis
- · Replies 5 ·
Graduate Detect the cosmic neutrino background
- nicksauce
- · Replies 1 ·
Graduate Observable Universe vs. HyperUniverse
- Chaos' lil bro Order
- · Replies 12 ·
Graduate Source for the margin of error of curvature
- zeebo17
- · Replies 3 ·
Undergrad Why Don't Heavier Elements Sink to the Sun's Core?
- Nickelodeon
- · Replies 2 ·
Graduate Low entropy in extreme tempertures?
- pivoxa15
- · Replies 11 ·
Stargazing Gravity anomaly during solar eclipse.
- diabolic
- · Replies 18 ·
Graduate What are Boltzmann brains and how do they relate to the landscape?
- 0xDEADBEEF
- · Replies 13 ·
Undergrad The Expanding Universe: Understanding Hubble's Law
- jbutcher
- · Replies 2 ·
Graduate Why Didn't the Universe Collapse Back to Singularity After the Big Bang?
- chi22
- · Replies 1 ·
Graduate Equivalence of FRW and Schwarzschild metrics for flat cosmology
- nutgeb
- · Replies 3 ·
Graduate Will humans ever really understand why the universe exists?
- Holocene
- · Replies 254 ·
Graduate How likely is a super solar flare?
- bwana
- · Replies 4 ·
Graduate Is the H.U.D.F. view in excess of 13 bly's. or not.
- Peter Watkins
- · Replies 40 ·
Undergrad Difference between Thermal and Kinetic Energy
- FrankPlanck
- · Replies 10 ·
Undergrad Can the universe expand faster than light?
- DARTZ
- · Replies 4 ·
Graduate Possible systematic error in WMAP temperature maps
- nicksauce
- · Replies 1 ·
Graduate Could modified gravity explain galactic rotation instead of dark matter?
- DecayProduct
- · Replies 33 ·
Undergrad How to find the position of a star in the sky
- Imaginedvl
- · Replies 8 ·
High School First broadcast TV satellite's orbit
- Pengwuino
- · Replies 4 ·
Undergrad Bigbang and its light coming to us
- shabeer_quark
- · Replies 2 ·
Graduate Evidence for stellar evolution since the Big Bang
- hkyriazi
- · Replies 3 ·
Should Hubble be deliberately crashed or preserved after deorbiting?
- Sorry!
- · Replies 19 ·
Graduate Could Our Universe Be Fractal?
- Loren Booda
- · Replies 6 ·
Graduate Can a Stellar Object Become a Black Hole through Relativistic Mass Increase?
- VelociBlade
- · Replies 12 ·
High School Beginner looking to learn physics and cosmology from the basics
- joshuabearden
- · Replies 1 ·
Undergrad Stellar evolution from formation through white dwarf stage
- KingAntikrist
- · Replies 9 ·
Stargazing Total Solar Eclipse 2009: July 22
- StarShips09
- · Replies 4 ·
Graduate Do the Universe's Greatest Voids Challenge Hubble's Law?
- Loren Booda
- · Replies 3 ·
Graduate Why do people refuse the idea that something caused the big bang?
- Aten
- · Replies 7 ·
Graduate Is the moon is moving away from us? or is the universe just expanding?
- bwana
- · Replies 14 ·
High School Why Doesn't the Moon Revolve Around the Sun Instead of Earth?
- pavi_elex
- · Replies 2 ·
High School What Is Time and How Does It Influence the Universe?
- bondinthesand
- · Replies 3 ·
Graduate The gravitational binding energy of the Milky Way?
- Researcher X
- · Replies 3 ·
Graduate Did Anti-Gravity Play a Role in the Universe's Early Expansion?
- scupydog
- · Replies 2 ·
High School What Really Happened to the Apollo Flag?
- seasnake
- · Replies 27 ·
Undergrad Satellite is in low orbit around the Earth
- Mentallic
- · Replies 7 ·
High School What Color Would the Sky Be with Different Suns?
- Garland220
- · Replies 2 ·
Graduate How Does the Sun's Luminosity Evolve Before the Helium Flash?
- qraal
- · Replies 2 ·
Graduate Can spacetime exist without energy?
- dshea
- · Replies 19 ·
Graduate How feasible is a space elevator on Mars and what are the design issues?
- sid_galt
- · Replies 14 ·
Graduate Gravitation: curved spacetime or a force?
- vinirn
- · Replies 1 ·
Graduate Is the universe expanding space or matter accelerating outward?
- Gear300
- · Replies 34 ·
Graduate Can Dark Matter Travel Faster Than Light?
- ACG
- · Replies 12 ·
Graduate Detecting gravity's effect on light
- ideasrule
- · Replies 3 ·
Undergrad Can Centripetal Force create Gravity?
- oragami
- · Replies 24 ·
High School Why haven't we launched any artificial satellites that orbit the Moon?
- Curiousity28
- · Replies 7 ·
Graduate Can a primitive galaxy nova or supernova?
- Loren Booda
- · Replies 8 ·
What Do Astronauts Research on the International Space Station?
- Tachyonie
- · Replies 3 ·
Graduate Where Do Neutrinos Travel in the Universe?
- davilla
- · Replies 2 ·
Graduate What are the implications of a perfectly flat universe?
- Rymer
- · Replies 31 ·
High School What Can You See with a Small Telescope in Missouri?
- Pupil
- · Replies 11 ·
Graduate Why does mass attract other mass?
- DRJTower
- · Replies 13 ·
Graduate Why Is the Universe Comprehensible?
- WaveJumper
- · Replies 56 ·
Graduate How many baryons are there in the universe?
- franoisbelfor
- · Replies 4 ·
Graduate Can Relativity explain Dark Matter?
- srfriggen
- · Replies 7 ·
Graduate How unlikely is the formation of an earth size planet made of Uranium?
- Researcher X
- · Replies 23 ·
High School Why doesn't the moon crash into Earth or fly away?
- MonkeyHouse
- · Replies 2 ·
Graduate Large Gas Cloud near Aquila Rift in Milky Way
- Astronuc
- · Replies 1 ·
Undergrad Can we use paramagnetism to create a magnetic field on Mars?
- Paper
- · Replies 3 ·
Undergrad Supernova explosions element detection.
- pratzzz
- · Replies 3 ·
Graduate Earth Atmospheric Absorption Lines
- cepheid
- · Replies 1 ·
Graduate Are galaxy clusters and superclusters rigorously defined or identified ad-hoc?
- nicksauce
- · Replies 7 ·
Graduate What substance fills the universe?
- Simple10
- · Replies 21 ·
Is Mars Going to be Highly Visible to Earth in the Near Future?
- RAD4921
- · Replies 12 ·
Graduate Can We Detect Uranium and Thorium Fusion in Stars Through Spectral Analysis?
- dangerbird
- · Replies 3 ·