Astronomy, Astrophysics, Cosmology Forum

High School What Does Expanding Universe Mean?

Undergrad Universe expansion -> t = - inifinite

Graduate Question on gravitational lensing

Graduate Why does the particle falling into a black hole have negative energy in Hawking radiation?

High School How could the Big Bang escape its own gravitational pull?

Graduate Can a Photon's Energy Approach Zero?

Undergrad Could a planet on the opposite side of the sun remain undetected?

Graduate Friiedman Fun Facts to know and tell

High School Will the sun orbit bodies with greater gravity than itself?

Graduate What are the unexpected aspects of cosmology?

High School Finding an asteroid database by position and date

Graduate Are Wormholes at the End of Black Holes a Possible Theory?

Graduate Can Energy Compression Create a Black Hole?

High School Edwin Hubble's Redshift and the Hubble Space Telescope

Graduate Could Big Rip expansion create new universes from particles?

Graduate Is There an Infinite Number of Universes in Infinity Itself?

Graduate Objects Entering Black Holes: The "Spaghetti" Effect

Stargazing Stargazing with a 500x reflector in light pollution

High School Electron, Atom, Planet, Star: Do All Galaxies Orbit a Single Mass?

Graduate UV Star Redshift 8: Doppler Effect Impact on IR Spectrum?

Graduate What is the greatest distance we can see a single star with current technology?

Undergrad Gravitational lensing and Dark matter

Undergrad How Far Can We See the Brightest Known Star?

High School Global warming and solar actvities

Undergrad What causes Earth's rotation and orbit around the sun?

Undergrad Mercury: Why Doesn't it Vaporize Away?

Undergrad So , we don't know how universe began?

High School How Will the Universe Ultimately Meet Its End?

High School Matter combined with Antimater question

Undergrad Telescope Size and Distance: Do We Need Four Times the Diameter?

Graduate Would the night sky still be dark with 2mm-sensitive eyes?

Graduate What is the role of Cepheid stars in determining the Hubble parameter?

Graduate Is the Friedmann equation derived ONLY from the Einstein Field Equations?

Graduate Can Two Infinitely Sized Objects Exist in an Infinite Space?

High School Can black holes and alien invasions explain the Tunguska event?

Undergrad Do black holes interact with dark matter/energy?

Undergrad Developments in Space Exploration

High School Discovering the Sun's New Twin: HD 101364

Undergrad Can the Speed of a Gamma Ray Burst Exceed the Speed of Light?

Undergrad Is Earth's Orbit Shifting?

Graduate Expanding and Accelerating Space in Layman's Terms

Graduate Limitation to mass of currently forming stars?

Graduate What if Jupiter suddenly vanished?

Graduate Do new bits cause the expansion and acceleration of the Universe?

Graduate Numerical Fourieri Analysis of a GRB light curve

Undergrad What do bandpass names like Hipparcos and Tycho B and V refer to?

Undergrad Moon Destruction: What Would Happen to Earth?

High School Are new planets and stars still forming?

Undergrad What accounts for the expansion of the Universe accelerating?

Graduate What would the largest anti-matter object be?

• Poll

Undergrad Space Vehicle Patent: Is Electromagnetic Propulsion Possible?

Undergrad If the universe is 13.7 billion years old, why is it larger than 13.7 billion light-years?

High School Gravity in Space: Why is Zero Gravity?

Undergrad Extracting galaxy coordinates from FITS files in C++

Graduate Is the Friedmann expansion the ultimate 'free lunch'?

Graduate Does Kepler's law apply to Earth's orbit if perihelion to aphelion takes different time?

Undergrad What are some other theories about dark matter and dark energy?

High School Measure of elevation of Antares at 30minute intervals

Graduate Sun's Normalcy: Is Less Nuclear Burning Possible?

Graduate Nonrelativistic perihelion drift, best references ?

Stargazing What can you see by eye through an 8" or 10" telescope?

• Poll

High School Is There Life on Mars and How Does Water Play a Role?

Graduate Why does distant light take time to reach us, and what happens to it?

Graduate How do millisecond pulsars remain intact?

Undergrad What is the capacitance of the sun?

Undergrad Does cosmology rely on unfound dark matter and dark energy?

Graduate Formation of Neutrons in Collapsed Stars

Graduate Why our time dimension is about to become space-like

Graduate Can assuming opposite phenomena help formulate physical theories?

Graduate Electricity and Birkeland currents in space

Graduate Can Energy Density in Deep Space Vacuums Be Measured?

Undergrad How did the heavier elements form?

Undergrad Angle viewed form erath between sun and planet.

Undergrad What is Meinel System and OH Meinel Emission Bands?

Graduate Can Light Escape the Boundaries of the Universe?

Undergrad Mean Orbital Separation Question

High School Is a Larger Dimension Required for the Universe's Expansion?

Graduate Interpretation of dark energy and gravity as the same thing

Undergrad The First Sputnik: How Was Geocentric Orbit Achieved?

Undergrad How would doubling the Moon's orbital distance affect day and month lengths?

Undergrad Airship Rotating Earth: Can it be Done?

Undergrad Where can I find a database of astronomical objects with mass and position data?

Stargazing Check the profile of a telescope mirror

Undergrad Evidence for the Big Bang theory

High School Distance from Sun to outside galaxy?

Undergrad Do Supernovae Emit Gamma Rays in All Directions?

Graduate Why hasn't dark matter been directly observed in the cosmic microwave background?

Graduate What theories depend on the Magellanic Clouds being part of the Milky Way?

Undergrad Orbits: explicit r(t) and theta(t)

Graduate Why do scientists believe the universe is infinite?

Graduate What Are the Minimum and Maximum Limits for Gas Giants and Terrestrial Worlds?