Astronomy and Astrophysics Forum

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Join in expert discussion on the topics of Astronomy and astrophysics. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.
Undergrad Galaxy Mass - How much is stellar/gas?
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Undergrad Use 3D laser scanning to map Outer Space?
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Undergrad Q: Limit on a moon's orbital radius due to sun's gravity
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Stargazing Remote Controlling Truss Dobsonian Telescope?
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High School Cell phones used to detect cosmic rays worldwide
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High School "WT1190F" is the name for space junk that will hit Earth
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Experience the Milky Way via 46 billion pixels
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Graduate Why Are Subterranean Colonies Rarely Proposed in Space Colonization Scenarios?
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Calculate the Gravity of a Black Hole
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Graduate Orbit Dynamics in an Expanding Universe
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Undergrad How was Galileo able to observe Venus's phases?
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High School How Are Black Holes Formed and What Are Their Key Facts?
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High School Where Do Wormholes Take Us in Space and Time?
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Graduate Can a See Saw Extend from Earth to Another Galaxy?
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What Would a Trip from Earth to Orion Look Like?
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Nice ongoing planetary alignment
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Undergrad Juno Flyby Anomaly - Searching for Answers
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Graduate Is a Magnetic Levitation Space Launcher Possible?
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High School Is this a photograph of water on Mars?
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Graduate Is the Universe's Expansion Actually Slowing Down?
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High School What are the ways we can search for alien life?
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High School Explore the Solar System with a Dynamic Simulator for Teaching - Free Download
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Proper motion of Ursa Major (Big Dipper)
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High School Move Mass in Space: How Much Pull?
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Graduate Saturn: Helium Rain, or non-indigenous planet?
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High School What Are the Physical Limitations of a Dyson Sphere?
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Graduate Heliocentric polar orbit crossing the Earth's orbit twice
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Graduate Collision of massive star with black hole
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Undergrad Kepler's 2nd across a system of planets
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Graduate Question re Galaxy Rotation Curve
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Graduate Mass of a Black Hole: Answers & Questions
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Graduate Likelihood of confirming past life on Mars
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High School Venus Info: Is It Hot & How to Cool It Down?
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Graduate Consequences of Overlapping Event Horizons in Supermassive Black Hole Mergers
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Graduate What happens to matter when it enters a black hole?
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Is the Celestron Omni XLT 120 Refractor Telescope worth the investment?
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Graduate Can Neutrons Emit Light Without Electrons to Swoosh Them Away?
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Graduate What Happens to Electrons in Synchrotron Radiation?
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Graduate Are Atoms Just Empty Space If Fundamental Particles Are Zero-Dimensional?
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Graduate What Is the Impact of Shape on Escape Velocity in an Expanding Universe?
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Undergrad Understanding Observing Frequency and Its Significance in Radio Astronomy
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Stargazing What are the upper physical resolution limits on telescopes?
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Graduate Comparing Radio and X-Ray Galaxies: Redshift vs. Emission Mechanism
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Graduate Possible to derive an approximation of G from a Saros ?
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High School Could Life Exist on Mars with the Discovery of Flowing Water?
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Undergrad Does the black matter has weight?
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Graduate Confusion re Laniakea Super Cluster
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Undergrad Dependence of rotational angular velocity of planets
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Graduate What is the purpose of the Einstein stress-energy tensor?
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Graduate How Does Synchrotron Radiation Influence Observations in Radio Astronomy?
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Graduate Radiation from the surface of a star
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Stargazing Why Aren't There Telescopes on the Moon?
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Graduate Spaghettification and gravity in theory of relativity?
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Graduate Population 1 vs Population 2 Stars: Metal Rich vs Metal Poor
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George Will endorses space research
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High School I've heard gravity can "fling" stuff, how does this work?
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Graduate Computing osculating orbital elements
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Undergrad Why can dark matter make our planets move in same velocity?
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Graduate How does gravity get out of a black hole?
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Graduate Destruction of Solar System by passing Star
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Graduate How Do Scientists Determine the Composition of a Star's Core?
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Graduate Why don't all neutron stars collapse into black holes?
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High School Sun & Horizon: Why Does it Look Different?
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Undergrad How Would a Halved Earth Mass Affect the Moon's Rotation Period?
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Lunar super eclipse Sept. 27th. 2015
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High School Find 1.25" Focuser for 8" Newtonian Telescope
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High School Need reliable resources on basic astronomy and quantum physics
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High School What Is the True Speed of Earth in Relation to the Solar System?
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Graduate Modified Newtonian Dynamics vs. Quantum Gravity
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Humans Settling on the Moon: What Do You Think?
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Undergrad Can Neutrinos Escape Black Holes?
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Graduate Finding Number of Stars that have Died
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Undergrad Why don't black holes become stars again?
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Graduate The Lords of the Rings among centaurs
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Stargazing Got my First Telescope | Celestron Sky Prodigy 130 | Astrophotography
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High School Who discovered the cause of a red moon?
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High School Unraveling the Mystery of the Comet Dust Layer
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Undergrad How much does weight affect re-entry into the atmosphere?
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Graduate Could the Higgs Boson Help Identify Dark Matter?
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High School Mars panorama from Curiosity shows petrified sand dunes
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Graduate How much is popping into and out of
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Undergrad How do we determine distances of objects in space?
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Russian cosmonaut back after record 879 days in space
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Graduate How can I apply probability to the cosmological constant?
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Undergrad Why Does Earth Appear Mostly Blue from Space?
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High School Why does Pluto revolve clockwise
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Is Galileo Similar to GPS?
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Sweeping over the south pole of Mars
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Undergrad Planet at the center of mass of a binary star system
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High School Could we throw stuff into space?
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Undergrad Moon's crust as fractured as can be
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Undergrad Astronomers find galaxy cluster with bursting heart
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Graduate Underground magma ocean could explain Io's 'misplaced' volcanoes
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SETI reborn—the new search for intelligent life
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The Mysteries of Cosmic Ray Data: A Comprehensive Guide
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Undergrad Who first found the Heliocentric or Geocentric Distances
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Graduate Cassini confirms global ocean at Enceladus
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Graduate Neutral hydrogen gas in galaxy clusters
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Graduate Oxygen is not definitive evidence of life on habitable extrasolar planets
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Graduate How Do You Calculate Hydrogen Ionization Using a Metagalactic Radiation Field?
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