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 Theory of the end of the universe
- jtg05f
- · Replies 2 ·
Undergrad How Do You Calculate the Minimum Velocity to Escape the Solar System?
- Ed Quanta
- · Replies 5 ·
Undergrad Polar coordinates of solar system
- DaveC426913
- · Replies 4 ·
Why can't we invest in privately owned Space Companies?
- BenVitale
- · Replies 6 ·
Graduate Exploring Primordial Universe w/ QUBIC: 400 Horns at 100 mK in Antarctica
- marcus
- · Replies 2 ·
High School How can I view a star catalog in a txt file?
- OrangKaya
- · Replies 2 ·
Graduate Is the Universe Analogous to Water with Entropy and Symmetry?
- closet mathemetician
- · Replies 6 ·
Graduate Understanding Radiation Pressure and Its Role in Star Dynamics
- TrickyDicky
- · Replies 4 ·
Graduate Could Dark Energy Be Linked to a Primordial Mother-Universe?
- rustynail
- · Replies 5 ·
Undergrad Life on Mars: Evidence of Ancient Life?
- derro
- · Replies 14 ·
Undergrad Why Doesn't the Sun's Core Contain Heavy Metals Like Earth's Core?
- leonstavros
- · Replies 3 ·
Graduate What made the universe have 3 dimensions, instead of some other number?
- satuon
- · Replies 42 ·
Undergrad The current planet count stands at 490
- amalmirando
- · Replies 11 ·
Graduate Variation of fine structure constant and spacetime?
- asimov42
- · Replies 2 ·
Graduate Question about the edge of the universe
- gonzo
- · Replies 21 ·
Graduate Size of the universe and human brain
- k354
- · Replies 6 ·
Graduate Accelerated Vacuum Space/ Universe Expansion
- Wave's_Hand_Particle
- · Replies 4 ·
High School Question why does the moon move around the earth
- shobat
- · Replies 7 ·
Graduate Could the Big Bang Have Originated from a Black Hole?
- Tetraspace
- · Replies 19 ·
High School Understanding Buoyancy: Why Do We Float in Water?
- University
- · Replies 1 ·
Undergrad Impacts of Excessive Gravity on Planetary Life
- Darkmisc
- · Replies 2 ·
High School Mysterious Flash in the Sky - Ask PF Community
- Siberion
- · Replies 17 ·
Graduate Eternal Inflation Time Will End
- Kevin_Axion
- · Replies 5 ·
Graduate Doppler effect of light spectrum
- binbots
- · Replies 3 ·
High School How are clusters of galaxies formed?
- exponent137
- · Replies 1 ·
Graduate Is Panspermia a Viable Explanation for the Origins of Life?
- skippy1729
- · Replies 4 ·
Undergrad Kepler's Third Law: Mass of Sun and Newton's Law
- The legend
- · Replies 2 ·
Graduate Is the Cosmological Principle Limited to Space Only?
- AWA
- · Replies 136 ·
Graduate Must a black hole be a point singularity?
- Bernie G
- · Replies 70 ·
Graduate What is the relationship between spacetime and energy?
- jameseg
- · Replies 4 ·
High School Finding the Angular Distance Between Jupiter and its Moons (Galilean)
- Dreyth
- · Replies 1 ·
Argument against Dark Matter - please enjoy yourself for a moment
- lenfromkits
- · Replies 3 ·
Graduate Could Solar Energy Beams Enable Interstellar Travel?
- rhyshanan
- · Replies 6 ·
Graduate Particles in our universe undetectable by us
- ufarad
- · Replies 3 ·
Graduate How is our speed (~605km/s) derived from the CMB dipole anisotropy?
- lenfromkits
- · Replies 3 ·
Stargazing Can Telescopes Show Recognizable Reflections at Long Distances?
- Newai
- · Replies 5 ·
Undergrad Calculating Earth Masses in a Planet with Earth-Size and Moon-Density
- brianh
- · Replies 2 ·
Undergrad Black hole gravitational question
- LoveKnowledge
- · Replies 8 ·
High School String of satellites transits moon?
- micahgtb
- · Replies 6 ·
Graduate Is the Standard Model of Cosmology built on a house of cards?
- Energyloop
- · Replies 26 ·
Graduate How much dark matter in each galaxy? Is it related to age?
- lenfromkits
- · Replies 19 ·
Undergrad Is space, time and energy linked?
- altairz
- · Replies 4 ·
High School Moon Question (Vacuum, air, escape vel.)
- nukeman
- · Replies 3 ·
Graduate Can the Li7 problem be resolved by increasing the dark matter ratio?
- BillSaltLake
- · Replies 3 ·
Undergrad Is Dark Matter Different from Dark Energy?
- Melodie Ann
- · Replies 22 ·
Graduate Can the Magnetic Field of a Black Hole Reveal Its Charge and Rotation?
- Dr Lots-o'watts
- · Replies 10 ·
Undergrad Constellation of date and the actual constellation that follows the sun
- Philosophaie
- · Replies 3 ·
Stargazing Trying to pick out a telescope (Need help)
- mkarger
- · Replies 14 ·
Stargazing Which Telescope is Best for Viewing Planets and Nebulae on a Budget in Wales?
- Harry-Wales
- · Replies 2 ·
High School Comet Passing by Earth: Effects & Destruction
- mersecske
- · Replies 10 ·
Graduate Escape velocity when in earth's orbit
- University
- · Replies 6 ·
Undergrad What Do You Call the Quantity When You Multiply Light Flux by Detector Area?
- Mu naught
- · Replies 3 ·
Graduate Astronomy research question. Thanks
- nukeman
- · Replies 6 ·
Graduate How Does B Mode Polarization Help Trace Gravitational Radiation?
- wolram
- · Replies 5 ·
Graduate About the origin of the universe? big bang cause?
- jeebs
- · Replies 12 ·
Graduate What Happens Inside a Black Hole's Event Horizon?
- ClamShell
- · Replies 105 ·
Graduate Was the Universe Always Infinite from the Moment of the Big Bang?
- Oldfart
- · Replies 10 ·
Graduate Lagrange Points, Maximum mass and their effects
- Chand-Ashoka
- · Replies 8 ·
Graduate Are Matter and Space-Time the Only Things That Exist in Our Universe?
- GladScientist
- · Replies 1 ·
Graduate What/how created first brane? first source of everything what/how
- SupaGenius
- · Replies 3 ·
Graduate Black Holes containg a Universe.
- KeithSloan
- · Replies 4 ·
High School Are there any geostationary orbits around the Moon?
- mersecske
- · Replies 1 ·
Graduate What Are the Key Questions About Supernova Data and the Modified Milne Model?
- JDoolin
- · Replies 116 ·
High School The origin of water in the universe
- pixel01
- · Replies 12 ·
Graduate How dark energy make universe to inflate?
- sweet springs
- · Replies 28 ·
High School Hi,please anybody tell any reference book for astrophysics.
- praveenpp
- · Replies 3 ·
Graduate What If Our Sun Were Blue? - Effects on Perception & Evolution
- MysticalSwan
- · Replies 2 ·
Undergrad Ow high above the horizon the sun would be on the vernal equinox
- University
- · Replies 2 ·
Undergrad Could Black Holes Be Tears in Space?
- sorad
- · Replies 14 ·
Graduate Were There Any Proposed Non-Expanding Cosmological Models Without Lambda?
- AWA
- · Replies 56 ·
Graduate Is the Planck Length real? How do we know?
- sorad
- · Replies 47 ·
Undergrad Quick angular measurement question about moon. Thanks
- nukeman
- · Replies 1 ·
High School Question about how stars appear to move westward?
- nukeman
- · Replies 2 ·
Graduate Wormholes expeling particles at superluminal speeds
- Boy@n
- · Replies 4 ·
Astronomical software for BCE Thuban era
- kr236rk
- · Replies 2 ·
High School Can you see Venus shining near the noon hour?
- OrionVTOL
- · Replies 16 ·
Graduate Astrophysics from a Boobie or a black climate control.
- Dima6666
- · Replies 12 ·
Graduate Can Black Holes Really Evaporate and Lose Mass?
- robsharp14
- · Replies 21 ·
Undergrad Why Do Galaxies Have a Spiral Shape? Understanding Gravity's Role
- Sniperman724
- · Replies 3 ·
Graduate How does information leak out of a black hole ?
- Suk-Sci
- · Replies 3 ·
High School Calculating speeds of radio to a planet
- cinematic
- · Replies 3 ·
Undergrad How do you calculate an intuitive date and time from the BIG BANG to NOW? :-)
- Wulgulmerang
- · Replies 28 ·
Undergrad Calculating Synodic Period using Sidereal Period: Is there a Reliable Formula?
- University
- · Replies 10 ·
Undergrad The black hole isn't actually a hole
- ketamynx
- · Replies 22 ·
Graduate Could the Gravitational Lensing Effect Explain the Galactic Rotation Anomaly?
- meemoe_uk
- · Replies 3 ·
Graduate What is the significance of particle-antiparticle radiation near black holes?
- mesinik
- · Replies 1 ·
Graduate Identifying the Inflaton (new paper Easson et al)
- marcus
- · Replies 3 ·
High School Which Direction Does the Milky Way Span Across the Sky?
- nukeman
- · Replies 6 ·
Graduate Bifurcated Asteroid - Centrifugal force
- higginsdj
- · Replies 1 ·
Undergrad Is the universe a closed system?
- abomb365
- · Replies 2 ·
Graduate Did Matter Exist Before Space-Time Began?
- binbots
- · Replies 4 ·
High School What keeps the planets in their consistant orbit?
- JBash
- · Replies 13 ·
Graduate Is accounting for relativistic effects necessary in solar system simulations?
- jumpjack
- · Replies 10 ·
Undergrad What causes variations in redshift measurements?
- Walternate
- · Replies 3 ·
Undergrad The universe is expanding & the universe is infinite
- .....
- · Replies 21 ·
Graduate Looking Back Through Spacetime in the Future
- PhanthomJay
- · Replies 5 ·
Graduate Blow up a black hole by filling it with electrons?
- satuon
- · Replies 11 ·
Graduate Yet another Dark Energy question
- diggy
- · Replies 5 ·
Graduate Used infinity to predict that another ClamShell
- ClamShell
- · Replies 8 ·
Graduate On String Theory's Predictiveness
- RLutz
- · Replies 2 ·