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
High School Why is it called the 'Universe?'
- EndlessTime
- · Replies 9 ·
Graduate Will charged black holes evaporate?
- Tachyonguy
- · Replies 23 ·
Undergrad Hubble Constant am I gettting this right?
- Loki180
- · Replies 25 ·
High School Why do black holes have such strong gravitational pull?
- Mabcs
- · Replies 3 ·
Graduate Orbital period of a star in the Milky Way?
- jcott
- · Replies 9 ·
Graduate Why Don't Observations Support the Big Bang's Optical Predictions?
- h_cat
- · Replies 10 ·
Stargazing Pictures from the Hubble Space Telescope
- Naty1
- · Replies 2 ·
Graduate Bigbang and the begginnig of time
- adjacent
- · Replies 5 ·
High School Why Isn’t the Night Sky Full of Light from All the Galaxies?
- adjacent
- · Replies 8 ·
Undergrad Satellite with period equal to that of its planet?
- Humaj
- · Replies 3 ·
Need a good analogy of finding life in the universe
- uperkurk
- · Replies 36 ·
Common miscons (e.g. it exploded from a singularity) &why to check FAQ
- marcus
- · Replies 14 ·
Undergrad Looking for some help understanding the Big Bang.
- Outasight
- · Replies 1 ·
Graduate What's the bandwidth of the Cosmic Microwave Background radiation?
- SpaceBear
- · Replies 14 ·
Graduate How Universe is expanding faster than speed of light?
- SecretOfnumber
- · Replies 4 ·
High School Space and Matter: Does it Push Objects?
- adjacent
- · Replies 2 ·
Undergrad Kepler mission announces possibly habitable planets found (18 April)
- marcus
- · Replies 6 ·
Graduate World's record for highest freq photon ever seen, nature or lab?
- Albertgauss
- · Replies 4 ·
Graduate CMB Angular Distribution: Understanding Gaussian Random Fields
- Madster
- · Replies 3 ·
Graduate NASA working on warp drive experiments
- PhysicsDad
- · Replies 3 ·
Undergrad What Defines a Different Universe?
- PhyHunter
- · Replies 5 ·
Graduate Did inflation set off the universe?
- SaxophoneofTim
- · Replies 19 ·
Graduate Video talk on Planck results by Kendrick Smith
- marcus
- · Replies 2 ·
Graduate Black Hole Singularity of a Universe
- tkopunek
- · Replies 2 ·
Undergrad How can the big bang allow infinate universes
- yup790
- · Replies 2 ·
Undergrad Is the Universe Infinite or Does It Have a Center?
- medgalis
- · Replies 2 ·
Graduate Black hole acceleration beyond C?
- DARKRIDEE
- · Replies 13 ·
Graduate Observational Cosmology & LCDM Model: What We Know
- Chronos
- · Replies 1 ·
Graduate Why dark matter is dark but not atoms
- 7555
- · Replies 5 ·
Graduate Searching for Dark Energy, Dark Matter & Gravitational Radiation
- wolram
- · Replies 4 ·
Graduate Our ideas on v_rec/c column added to J's calculator
- marcus
- · Replies 31 ·
Undergrad Will PhoneSat revolutionize satellite technology?
- Greg Bernhardt
- · Replies 1 ·
Undergrad Does three Dimension realy exsist and why?
- SecretOfnumber
- · Replies 2 ·
Undergrad Equation of Gravity's influence relative to objects
- Galric
- · Replies 1 ·
Undergrad What Are Quasars & How Do They Work?
- medgalis
- · Replies 5 ·
High School Why do stars collapse in on itself ?
- PhyHunter
- · Replies 20 ·
Undergrad How Does Spinning a Ship in Space Create Artificial Gravity?
- Over My Head
- · Replies 11 ·
Undergrad Tidal bulge on the moon, and its facing etc
- Curious45
- · Replies 8 ·
Graduate Report on expansion history of universe
- wolram
- · Replies 3 ·
Graduate Hubbles law and expansion of the universe
- trot
- · Replies 8 ·
Undergrad Origin of the Moon and it's Retreat
- enceladus_
- · Replies 5 ·
High School Is it possible for a star to gain mass throughout it's life?
- liubare
- · Replies 6 ·
Is Dark Matter Finally Revealing Its Secrets?
- Tanelorn
- · Replies 1 ·
Undergrad Why is Far-UV spectrum unobservable
- PianoDentist
- · Replies 2 ·
Undergrad Directing dangerous objects to Sun
- Yuri B.
- · Replies 6 ·
Stargazing $1.3 billion Thirty Meter Telescope (TMT) gets approved
- Greg Bernhardt
- · Replies 2 ·
Undergrad How exactly does the universe expand?
- Thomas1989
- · Replies 16 ·
Undergrad Can Asteroid Mining Technology Serve as a Global Defense System?
- thorium1010
- · Replies 65 ·
Graduate Stress Energy Tensor - Confusion about signs and metrics
- Allday
- · Replies 2 ·
Graduate What Was the Initial Energy of the Universe: Planck Energy or Singularity?
- liometopum
- · Replies 3 ·
Graduate How quickly would Mars loose its atmosphere?
- Menninger
- · Replies 3 ·
High School Calculating the Kinetic Energy of a Meteor: What Factors Influence its Velocity?
- Numeriprimi
- · Replies 5 ·
Graduate Could Dark Energy be concentrated inside galactic bubbles?
- skeleton
- · Replies 5 ·
Graduate Why do stars collapse in ot itself? Part 2
- PhyHunter
- · Replies 14 ·
Undergrad Observing stuff in space over various distances
- wendal
- · Replies 9 ·
Undergrad Is Staring at a Red Dwarf Harmful?
- AndromedaRXJ
- · Replies 11 ·
Graduate Cosmological Observations Conundrum
- wstrohm
- · Replies 43 ·
Graduate Understanding Mercury's Precession
- OnceKnown
- · Replies 5 ·
Undergrad Characteristics of electromagnetic waves traveling through the cosmos.
- morningstar
- · Replies 9 ·
High School What is the Speed of Earth on its Orbit During Equinoxes and Solstices?
- Yuri B.
- · Replies 9 ·
Graduate Exploring the Transparency of Black Holes: A Relativity Question
- stargazer3
- · Replies 17 ·
Graduate Is Big Bang a Misleading Term for Describing the Early Universe?
- dpooga
- · Replies 1 ·
Graduate Is the Solar system expanding with the Universe?
- johne1618
- · Replies 7 ·
Graduate Are black holes explained by complex analysis?
- Hercuflea
- · Replies 16 ·
Graduate Atomic Hydrogen gas cloud to Star
- Brown Arrow
- · Replies 9 ·
Undergrad The acceleration of the expansion of the known universe
- Over My Head
- · Replies 27 ·
Graduate Do All Stars Rely on Quantum Tunneling for Fusion?
- deadscientist
- · Replies 2 ·
Graduate Why do the smallest luminous objects lie along a line corresponding to
- Brown Arrow
- · Replies 5 ·
Graduate Eternity's Big Bounce: What Do You Think?
- Dionysos25
- · Replies 1 ·
High School The Earth as pendulum tied not to the Sun
- Yuri B.
- · Replies 9 ·
Undergrad Size of VY Canismajoris and gravity
- SecretOfnumber
- · Replies 5 ·
Graduate The awkward expression 1 km/s per Mpc-the radius is better
- marcus
- · Replies 12 ·
What is the estimated worth of a planet made entirely of diamond?
- 42Physics
- · Replies 21 ·
Graduate Can Extended Theories of Gravity Explain Dark Matter and Dark Energy?
- CWatters
- · Replies 24 ·
Graduate Placing a cargo on a parabolic orbit from europa moon of Jupiter
- Cerdocyon
- · Replies 3 ·
Is the Universe Organized or Chaotic in its Younger Years?
- capcom1983
- · Replies 11 ·
High School What is this galaxy? I can't work it out
- Shutupwesley
- · Replies 17 ·
Graduate Shape of Universe: Is Flatness Approved? Causes of Big Crunch
- Chemist@
- · Replies 119 ·
Undergrad Is there a place in the Universe without any matter and energy?
- gen6
- · Replies 12 ·
Graduate Understanding Circumstellar Disks: Exploring Surface Density in 3D
- robotopia
- · Replies 6 ·
High School Is Earth Orbiting the Sun Dynamically?
- syrf3763
- · Replies 8 ·
High School Why Does the Sun Bob Up and Down in its Orbit?
- enceladus_
- · Replies 28 ·
Graduate Can Energy exist with the absence of matter?
- Ayham
- · Replies 2 ·
Graduate It's a rate (not a constant) so let's call it that
- marcus
- · Replies 8 ·
Graduate Conceptual Q: Gravity, Angular Momentum, and Galaxies
- tolove
- · Replies 9 ·
High School Is Constant Rest Possible in Outer Space?
- MathematicalPhysicist
- · Replies 2 ·
Graduate Could the Big Bang Have Been a Massive Black Hole Eruption?
- Randomtask94
- · Replies 17 ·
Graduate Black hole growth and evaporation
- egcavalcanti
- · Replies 2 ·
Graduate Are Statistical Mechanics Adequate for Interstellar and Intergalactic Clouds?
- anorlunda
- · Replies 3 ·
Graduate Nature of spacetime and interest in the field
- Macrobe
- · Replies 1 ·
Graduate What's the latest update on the possible discovery of dark matter?
- DiracPool
- · Replies 13 ·
Graduate What is the relationship between light and space?
- Seminole Boy
- · Replies 7 ·
Graduate Which Planck numbers to use? (Ned Wright's choice?)
- marcus
- · Replies 10 ·
Graduate Kudo list of well-written exchanges for the month of April :-D
- marcus
- · Replies 0 ·
Graduate Thoughts/Questions about GR and dark matter
- DLH112
- · Replies 3 ·
Graduate Would Dark Energy Alter Layzer's Entropy Model?
- j1mcross
- · Replies 8 ·
Graduate Why doesn't dark matter clump together?
- mrspeedybob
- · Replies 1 ·
High School Why Do We Search for Exoplanets?
- wolram
- · Replies 20 ·
Graduate Formula for the dark energy density (dark energy formula)
- Alexroma
- · Replies 5 ·
Graduate Analyse Simulated Galaxies with SDSS Telescope | Survey by J.W. Trayford
- wmfw23
- · Replies 3 ·