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 Earth orbit vs. changing mass of Sun
- Dorje
- · Replies 2 ·
Graduate Determinism from a unique Big Bang initial condition
- jaguar99
- · Replies 3 ·
Undergrad How can the distance to nearby stars be calculated using the parallax method?
- MathematicalPhysics
- · Replies 2 ·
High School Can You See Light in a Black Hole?
- darkar
- · Replies 15 ·
High School Requirements for a habitable planet
- Imparcticle
- · Replies 14 ·
Undergrad Program about the birth of the universe
- cen2y
- · Replies 5 ·
Find Astronomical Discrepancies at www.BadAstronomy.com
- Imparcticle
- · Replies 4 ·
Undergrad How long does a mission to Mars take, including crew stay?
- MathematicalPhysics
- · Replies 4 ·
Undergrad How far can current radars reach in space?
- bothnicum
- · Replies 9 ·
High School What Are the Largest Stars in Our Universe?
- juan avellaneda
- · Replies 7 ·
Graduate Gravity of Black Holes: What Escapes and What Doesn't?
- Ghost of Progress
- · Replies 3 ·
Undergrad What damage would a bomb explosion cause in a vacuum?
- timejim
- · Replies 28 ·
Graduate How Does Gravity Warp Space-Time According to Einstein's Theory?
- threewood14
- · Replies 4 ·
High School Asteroid 2004 FH: Close Flyby and Potential Impact Creates Concern
- Orion1
- · Replies 2 ·
Undergrad Dark matter affecting galaxy rotation
- billy_boy_999
- · Replies 4 ·
Will Advertisements Dominate the Night Sky?
- Phobos
- · Replies 6 ·
Undergrad Australian Scientists Confirm Past Life On Mars
- Nommos Prime (Dogon)
- · Replies 3 ·
Undergrad When is a Planet not a Planet ?
- Aquafire
- · Replies 2 ·
What did the Mars rovers discover about Earth from the Martian surface?
- Phobos
- · Replies 2 ·
What Are Edna and Quaoar in Our Solar System?
- Mentat
- · Replies 2 ·
Graduate Is there any research into the possability the universe is a fractal function?
- modmans2ndcoming
- · Replies 7 ·
Graduate Confidence Levels: Andrew R. Liddle's Astronomy Centre Paper
- wolram
- · Replies 4 ·
Graduate Source of gammas from Milky Way centre
- Nereid
- · Replies 5 ·
Undergrad What Causes Galactic Plains?
- M.C.
- · Replies 5 ·
High School What is the largest known orbit?
- M.C.
- · Replies 2 ·
Graduate Avoiding A Crash Course In Planetary Defense
- Ivan Seeking
- · Replies 3 ·
Undergrad Spirit Rover Nightshot 'object'?
- check
- · Replies 7 ·
Graduate Plotting 180 Degrees Apart Galaxies in Spacetime Diagram
- thorium
- · Replies 1 ·
Graduate The Ultra Deep Field: 10,000 galaxies from 13 billion years ago
- Orion1
- · Replies 3 ·
Undergrad Does increasing redshift with distance imply cosmic deceleration?
- billy_boy_999
- · Replies 8 ·
Graduate Osiris, a chthonian planet - a very physical hell?
- Nereid
- · Replies 8 ·
Graduate Physics in the distant universe - same as on Earth? (history question)
- Nereid
- · Replies 3 ·
Undergrad How far back in time can we observe with our current technology and telescopes?
- meteor
- · Replies 28 ·
Graduate Searching for the Centre of the Universe: Is it at Rest?
- JulianHeawood
- · Replies 1 ·
Graduate How Does a Crystal Turn Space Inside Out?
- Evo
- · Replies 5 ·
Graduate Are there practical applications for l2 in mathematics and physics?
- sparkster
- · Replies 3 ·
High School Have Scientists Discovered a 10th Planet in Our Solar System?
- Grizzlycomet
- · Replies 10 ·
Will Bush's Moon-Mars Initiative hurt other space programs?
- Phobos
- · Replies 6 ·
Graduate Seeking Answers to Geophysical Questions About the Big Bang Theory
- JulianHeawood
- · Replies 4 ·
Hubble telescope captures distant supernova
- Tsu
- · Replies 4 ·
Graduate Why do gamma-ray bursts release so much energy?
- wolram
- · Replies 12 ·
Graduate Type Ia supernovae evidence for cosmic deceleration then acceleration
- wolram
- · Replies 2 ·
High School Is it Possible to Fly an Airplane on Mars?
- Thomas1980
- · Replies 3 ·
Graduate Where in the UNIVERSE, if at ALL does the past exist?
- kjacobie
- · Replies 12 ·
Undergrad Understanding Birkeland Currents in Space
- wolram
- · Replies 6 ·
NASA Finds Evidence of "Soaking Wet" Mars with Rover
- Phobos
- · Replies 7 ·
Graduate Does the MBR display orbital motion relative to us?
- Loren Booda
- · Replies 5 ·
What can (US) amateur astronomers do to help save Hubble?
- Nereid
- · Replies 3 ·
Remind you that Jupiter is really close to Earth
- eagleone
- · Replies 4 ·
High School Practical astronomy project ideas for high school
- BlackJack
- · Replies 4 ·
High School Can Stars Really Collide?
- BlackJack
- · Replies 3 ·
Graduate Is WMAP data distorted?
- wolram
- · Replies 18 ·
High School How can gyros and fins on spaceships improve long-term survival in space?
- Sariaht
- · Replies 5 ·
Graduate Under abundance of lithium may solve existence DM
- wolram
- · Replies 2 ·
High School What is dark matter?
- gunblaze
- · Replies 2 ·
Graduate Oscilating Universe WITH Perpetual Expansion
- LURCH
- · Replies 2 ·
Graduate Why Does an Observer Not See Entering a Black Hole?
- slow progress
- · Replies 2 ·
Undergrad How are astronomical distances beyond parallax measured?
- jay
- · Replies 3 ·
High School Earth almost put on impact alert
- Ivan Seeking
- · Replies 12 ·
Graduate What is the significance of Fermat's Last Theorem in modern mathematics?
- PFanalog57
- · Replies 54 ·
High School What does space look like from space?
- CGameProgrammer
- · Replies 7 ·
High School Is it worth upgrading from a 4.5" Konus 500 to an 8" telescope?
- Squeeze
- · Replies 2 ·
Graduate Roser Pello's galaxy is receding at 2.3 times the speed of light
- marcus
- · Replies 6 ·
Undergrad Observe all the ages of the universe
- juan avellaneda
- · Replies 3 ·
Opportunity makes 'significant' finding
- Evo
- · Replies 2 ·
High School UFO's trapped in the black hole
- gunblaze
- · Replies 2 ·
High School Universe Age: 13 Billion Years, Revealed by Light Travel
- Dagenais
- · Replies 26 ·
Graduate Effects of acceleration on black holes.
- Lord Flasheart
- · Replies 2 ·
Graduate How could two Big Bangs have created the Universe?
- Shailinder
- · Replies 1 ·
Graduate Gap theory approach to spacetime quantization and black holes
- Radic
- · Replies 27 ·
Undergrad Does gravity play a role in the expansion of the universe?
- Sko
- · Replies 9 ·
High School Spacefuel: Utilizing Iron-Dust as a Cheap and Efficient Fuel Source
- Sariaht
- · Replies 3 ·
Graduate Physics in distant galaxies - same as on Earth? (history question)
- Nereid
- · Replies 10 ·
High School Is dark matter the same as dark energy?
- alias25
- · Replies 17 ·
Graduate How did galaxies and quasars form in the first 400 million years after the Big Bang?
- Aquafire
- · Replies 2 ·
High School What's the simplest way to view sunspots at home?
- wimms
- · Replies 6 ·
Discernment , duality and perception ,singularity (not black hole)
- peter goldman
- · Replies 4 ·
Graduate Ekpyrotic model and CMB observations?
- branebrain
- · Replies 3 ·
Graduate Can We Determine the Age of the Universe Based on the Color of the Night Sky?
- Antonio Lao
- · Replies 1 ·
Graduate Existence of dark matter questioned
- wolram
- · Replies 27 ·
Graduate Testing dark energy models by measuring the equation of state parameter w
- marcus
- · Replies 1 ·
High School Why do stars twinkle and what causes it?
- alchemist
- · Replies 8 ·
Undergrad Questions about Universal Gravitation
- Blood Junkie
- · Replies 5 ·
Amateur astronomer finds new nebula
- chroot
- · Replies 3 ·
High School Why does the sun maintain a spherical shape despite being made of gas?
- Guard
- · Replies 14 ·
Space tourism market research survey
- enigma
- · Replies 20 ·
Graduate White dwarf BPM 37093 has a moon-sized crystal core
- meteor
- · Replies 7 ·
Graduate Member of Michio Kakus's organisation
- SoumyaBanerjee
- · Replies 1 ·
Undergrad Falling Back to Orbit: Can Rockets Change Their Orbit?
- wimms
- · Replies 1 ·
High School What is the largest object discovered in the Solar System since Pluto?
- meteor
- · Replies 1 ·
Undergrad Gravity acting as a repulsive forces at long distances
- ashwin
- · Replies 4 ·
Graduate Could Einstein have been right originally?
- Shawn Wheeler
- · Replies 5 ·
Graduate Why do planets rotate at different speeds?
- Ian
- · Replies 4 ·
Graduate Is There a Tuning Relationship Between Lunar and Solar Periods?
- jjalexand
- · Replies 18 ·
Graduate Detecting cosmological constant effects in black hole X-ray spectra
- marcus
- · Replies 1 ·
Undergrad Could Life Exist in the Hidden Oceans of Jupiter's Moons?
- Orion1
- · Replies 2 ·
Graduate How Are Black Holes Linked to Time Travel?
- startic84
- · Replies 3 ·
Graduate Tamara Davis thesis Expansion and Cosmic Horizons
- marcus
- · Replies 3 ·
Graduate Schw. black hole ringing frequencies
- marcus
- · Replies 9 ·