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 Europe's long term plans for cutting edge astronomy and cosmology research
- Nereid
- · Replies 1 ·
The Big Bang and the Creator's Soup
- timejim
- · Replies 8 ·
Undergrad Why do stars emit electromagnetic waves?
- neoweb
- · Replies 14 ·
Graduate Is Our Universe the Result of a Black Hole from a Previous Universe?
- RAD4921
- · Replies 4 ·
Undergrad What is the energy of the combined body after the collision?
- ori
- · Replies 9 ·
High School Can the Speed of Light Change or Increase?
- tumor
- · Replies 32 ·
Suggestions for a black hole book title
- SpikeVoyager
- · Replies 8 ·
Graduate What Are the Implications of H. Arp's Red Shift Quanta Theory?
- wolram
- · Replies 7 ·
Graduate Is cosmology in constant trouble?
- Chronos
- · Replies 15 ·
High School What do magnitude and latitude mean in astronomy?
- A_I_
- · Replies 6 ·
High School Skywatcher Explorer 130P for deep-sky objects under light pollution?
- neoweb
- · Replies 4 ·
Humidity and Lenses: What to Do When Too Much Dust in House
- JasonRox
- · Replies 2 ·
Graduate The temperature of empty space What now?
- Jack Martinelli
- · Replies 7 ·
Graduate Statistical superposition of universes
- Loren Booda
- · Replies 1 ·
Graduate What can the GRACE Gravity Model 01 reveal about Earth's gravity field?
- sol2
- · Replies 9 ·
Graduate Is the Kuiper Belt responsible for the subtle slowdown in Bode's law?
- Rothiemurchus
- · Replies 8 ·
Graduate Can the universe expand faster than light during inflation?
- colinr
- · Replies 22 ·
Longbets.org predictions on science and sociology
- turbo
- · Replies 1 ·
Are We Really Alone in the Universe?
- Erring Flatley
- · Replies 44 ·
Graduate Understanding Photon Collisions with Solar Sails
- gonzo
- · Replies 11 ·
Undergrad How can we study the composition of the Sun and Jupiter without direct samples?
- S. Dilly
- · Replies 7 ·
High School Are There "Moons of Moons" in the Solar System?
- BrianJ.
- · Replies 7 ·
Graduate Quantized space-time and redshift.
- turbo
- · Replies 30 ·
Graduate Does a Black Hole Have a Greater Gravitational Field Than Its Original Star?
- JV
- · Replies 5 ·
High School Why do Earth, Moon, and Venus have different numbers of craters?
- S. Dilly
- · Replies 3 ·
Graduate Has Gravity Probe B been a waste of money?
- Garth
- · Replies 41 ·
Undergrad Can a volume of space exist without energy?
- force5
- · Replies 36 ·
Graduate Does Meson Exchange Cease in Neutron Stars at Sub-Femtometer Distances?
- kurious
- · Replies 10 ·
Graduate Why does the rubber sheet analogy assume gravity exists?
- anand
- · Replies 9 ·
Graduate Is Hawking’s new idea on Black Hole original or adopted?
- shashi
- · Replies 14 ·
High School Could This Be the First Photo of an Extrasolar Planet?
- meteor
- · Replies 1 ·
Graduate Gravity constant G = 3(H^2)/[4pi(e^3)ρ].
- Nigel
- · Replies 2 ·
Graduate Alternate dimensions or Universes
- Gale
- · Replies 13 ·
High School Do nearby stars have an effect on the Sun and its planets?
- Erus
- · Replies 2 ·
Graduate No, this is not a question for biologists.
- kjones000
- · Replies 8 ·
Graduate Will New Objects Appear in the Sky as Time Passes?
- Gerinski
- · Replies 19 ·
Graduate The Sun's X-file Under The Spotlight
- Ivan Seeking
- · Replies 2 ·
Graduate The Infinite Universe Expands is Inaccurate
- Imparcticle
- · Replies 6 ·
Graduate CIPA - a fantastic Zero Point Energy website
- turbo
- · Replies 5 ·
Graduate Can infinity become smaller, and does Hawking argue for a finite universe?
- veryyoung
- · Replies 3 ·
Graduate Does GR predict universal expansion without dark energy?
- quasar987
- · Replies 71 ·
Graduate Does the universe dance in forms?
- plum
- · Replies 27 ·
Graduate Was Space Present Before the Big Bang or Did It Expand with the Universe?
- Harveyf
- · Replies 83 ·
High School Creating an orbit simulator in VB6
- walter
- · Replies 17 ·
Undergrad Are Cosmic Rays Particles or Radiation?
- RAD4921
- · Replies 2 ·
Undergrad Does universe expansion speed affect relativity?
- Stonefeather
- · Replies 20 ·
Undergrad Cosmic background radiation - alternative proposal
- zforgetaboutit
- · Replies 55 ·
What do you think will be the fate of the universe?
- Gold Barz
- · Replies 43 ·
Stargazing First moon photography attempt with Clavius and Tycho craters
- check
- · Replies 5 ·
High School What kinds of space rays are detectable on earth
- Imparcticle
- · Replies 3 ·
Undergrad What is the formula for calculating delta v for escape velocity?
- tony873004
- · Replies 3 ·
Graduate I've yet to understand the finite universe
- plum
- · Replies 11 ·
Undergrad Chances of aliens finding Earth disappearing
- Ivan Seeking
- · Replies 18 ·
Undergrad Black Hole Implosion or Supernova Explosion - Which is More Powerful?
- dave19903652
- · Replies 6 ·
Graduate Calculating The Event Horizon of a Supermassive Black Hole
- Vast
- · Replies 2 ·
Undergrad Strange SETI Signal from ~1000 LY
- Ivan Seeking
- · Replies 9 ·
Graduate Could Quantum Gravity Predict a Long-Distance Invariant Scale?
- marcus
- · Replies 7 ·
High School Planets Orbit Sun: Why Same Direction?
- Ezekiel.
- · Replies 5 ·
Undergrad How Fast Is the Milky Way Moving Relative to the Cosmic Background Radiation?
- kingofjazz
- · Replies 3 ·
Undergrad Could Geostationary Satellites End Up Gathering Over the Indian Ocean?
- kurious
- · Replies 11 ·
Graduate Is there a mechanism for reproducing universes?
- Vast
- · Replies 9 ·
Graduate Could Sedna be a trapped rogue planet
- mee
- · Replies 5 ·
Mysterious signals from 1000 light years away
- Adam
- · Replies 1 ·
Undergrad Mathematical framework for elliptical orbits
- daveed
- · Replies 1 ·
Graduate Star formation and distribution in spiral galaxies
- hellfire
- · Replies 3 ·
Graduate Is the Orion Trapezium Exploded from a Pre-Stellar Body?
- juan avellaneda
- · Replies 1 ·
Undergrad Why is gravity always attractive and not repulsive?
- HIGHLYTOXIC
- · Replies 17 ·
Graduate Flat geodesics mediate spacetime
- Loren Booda
- · Replies 16 ·
Undergrad Elliptical Orbits: Simple Explination & Gaining Energy
- Cyrus
- · Replies 9 ·
High School Possible terrestrial extrasolar planet found
- Phobos
- · Replies 11 ·
High School Appearance of Jupiter and Saturn at 200x magnification
- VantagePoint72
- · Replies 12 ·
High School What is dark energy?
- no idea
- · Replies 3 ·
Graduate How is the entropy of a star calculated?
- kurious
- · Replies 3 ·
Graduate Is Our Universe Just One Bubble in a Multiverse?
- sol2
- · Replies 9 ·
Graduate Hyperbolic, Parabolic or Elliptical Orbit?
- cj
- · Replies 1 ·
Does the universe cycle like Hindu and Buddhist cosmology suggests?
- Gold Barz
- · Replies 17 ·
High School You Are the Centre of the Universe
- The Binary Monster
- · Replies 37 ·
High School What would seasons be like if Earth's axis were perpendicular to its orbit?
- S. Dilly
- · Replies 5 ·
Graduate Should PF Have a Separate Quantum Gravity Forum?
- marcus
- · Replies 15 ·
Stargazing What Telescope Should I Buy Under $700?
- VantagePoint72
- · Replies 4 ·
Graduate Are interstellar distances measured through curved or flat space?
- asprin
- · Replies 2 ·
Undergrad Questions About Black Holes - Answers for Non-Physics Students
- UglyEd
- · Replies 8 ·
Graduate Why do the Higgs boson and dark energy trouble me?
- The Binary Monster
- · Replies 5 ·
Graduate The Big Leak, Universe Equilibrium, Time
- Erus
- · Replies 2 ·
Graduate Celestial Die Hards: Escape Velocity at 1 Planck Length
- kjones000
- · Replies 1 ·
Undergrad Is the Parallax Method Still the Most Widely Used for Measuring Star Distances?
- neoweb
- · Replies 4 ·
High School Weightlessness in the Center of The Earth?
- hexrd
- · Replies 10 ·
Graduate Your weight on a Space Elevator ?
- MonstersFromTheId
- · Replies 8 ·
Stargazing Looked through a telescope for the first time
- JasonRox
- · Replies 17 ·
Undergrad Why Do Variable Stars Like R Hydra Exhibit Unique Color Changes?
- juan avellaneda
- · Replies 5 ·
Graduate Can dark energy prevent neutron stars from collapsing into black holes?
- kurious
- · Replies 4 ·
Graduate Unruh's difficulties with closed isotropic loop quantum cosmology
- marcus
- · Replies 9 ·
Burning Man 2004- The Vault of Heaven
- setAI
- · Replies 5 ·
Are we alone in the universe?
- Gold Barz
- · Replies 11 ·
Graduate Is G truly a constant in the equation F(M,m,r)=GMm/rr?
- Gonzolo
- · Replies 5 ·
Graduate QG plasma and gamma ray bursters
- kurious
- · Replies 18 ·
Graduate Sound velocity in a pure neutronium neutron star
- Orion1
- · Replies 12 ·
Building a small observatory for an astronomy club
- Gale
- · Replies 5 ·
High School What is Dark Matter and is it a reputable concept in astronomy and cosmology?
- alexkerhead
- · Replies 7 ·
Graduate Are there multiple theories for the origin of dark matter and dark energy?
- salsero
- · Replies 66 ·