Astronomy, Astrophysics, Cosmology Forum

Graduate Why does a reflecting surface in a solar sail produce thrust if light is reflected back?

Graduate How Does Quantum Probability Affect Discrete Space in Loop Quantum Gravity?

Undergrad Absolute 0 at the before the begging

Graduate Falling Object at c: Relativistic Position Expression for the Attracted Object

High School How Will Our Solar System End

High School Solar System Similar to Ours Found

Undergrad How Do Black Hole Schematics Work?

Undergrad Out there physics/astrology question

High School Can stars actually flatten from spinning too fast?

High School Scary Statistics: American Beliefs from 2002-1969

Graduate Solving the Mysteries of Galaxies

Undergrad Finding spatial boundaries for Andromeda and Milky Way in a star database

High School What Are the Latest and Upcoming Missions to the Outer Planets?

Graduate Second black hole may lurk at Milky Way's heart

Graduate So, what is the right question to ask about this topic?

High School Why does Earth appear to move in the lunar sky if the moon is tidally locked?

Graduate Could galaxies be on a sphere's surface with light traveling around the periphery?

Graduate Could Sub-Universes Exist Within an Infinite Multiverse?

Graduate Is the Universe Shaped Like a Three-Torus?

Graduate Age of a Distant Galaxy: Is It Double?

Undergrad Was the big bang actually a white hole?

Graduate 96 percent of cosmos puzzles astronomers

Graduate Can the universe behave illogically?

Graduate What Are Supernumerary Dimensions and Their Role in LQG Theory?

Graduate How Does Gravity Affect Light?

Graduate Alternatives to dark matter for explaining galactic rotation

Graduate What are Stephen Hawking's Calculations on the Eternity of the Universe?

Graduate Would we notice time reversing in a big crunch?

Undergrad How does the Doppler shift tell us if stars are moving away from us?

Graduate Strange star puzzles astronomers: BBC

High School Absolute zero for the boomerang nebula?

High School Is the Sun spherical or elliptical in shape?

Graduate Will Earth's Moon Follow Other Moons into a Ring System?

Graduate Can the universe be infinite if brane theory is correct?

High School A question of Planetary formation.

Undergrad What is dark matter and why did we miss it before?

High School How to construct an aperture stop for a telescope

Graduate Does nonbaryonic dark matter exist?

Stargazing Need advice/opinions on a telescope

High School Source of Energy for the Rotation of Earth

Graduate Universe can surf the Big Rip; Nature article

Graduate What Can We Truly Know About the Universe?

Undergrad What would happen to Earth if the Moon escaped?

Graduate Solving Hubble Constant with rhocrit and Cosmological Constant

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Graduate Fact or Fiction? Cosmology Statements

Graduate Is the Expansion of Space Truly Universal?

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Graduate What is the current radius of the observable universe?

Graduate Light Years And Expanding Universe

Graduate How were heavy elements heavier than iron created and distributed to Earth?

Undergrad Information request about Galaxies

High School How fast is our solar system moving in space?

Graduate Why do planets orbit the sun if gravity is negligible?

Graduate Notion of matter, space and time

Graduate Estimating Critical Mass for Expansion

Graduate Space genetics theory: mass consumes space, radiation creates it

Undergrad Could a large impact have tilted Uranus on its side?

Stargazing Best Telescope Recommendations for City Viewing Near NYC

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Graduate Which is the metric of the Universe?

Undergrad What is the density in atoms per unit volume of most nebulas?

High School What is a tevatron?

Undergrad Do distant galaxies appear where they were or where they are now?

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Undergrad What's your estimate of the other Drake equation?

Graduate Why the 4th dimension was created

High School Why does Earth appear blurry in images taken from Mars?

Graduate Local Group velocity vs solar system motion relative to CMB

Graduate How does this oscillating electromagnetic field keep its information?

Graduate Can space be perfectly flat in voids between galaxies?

Graduate Is space a physical entity or just a container for objects?

High School How does the rotation of the earth around the axis bring about changes

Graduate How can God know the future if quantum mechanics is non-deterministic?

High School Are There Stars Primarily Composed of Helium?

Graduate 3pi/Lambda = area of cosmological horizon

Graduate Cosmological redshift: how much energy has gone missing?

Graduate Lee Smolin predicted dark energy back in 1995

High School What initiates star birth and how does gravity focus debris into a star?

Graduate A toolkit for working with natural units

Graduate One theory is that the higgs particle gives matter mass

Graduate What are the galactic coordinates of the Cosmic Microwave Background hotspot?

Graduate How long before the sun goes red giant?

Graduate What is the quantitative understanding of Hawking radiation from a black hole?

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Graduate What prevents black hole singularities from being reached?

Graduate Understanding Rho Crit: The Critical Density of the Universe

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Graduate What is the critical density of the universe?

Graduate SauwIs the concept of finite space in infinite time scientifically valid?

Undergrad Are fundamental physical laws dependent on our choice of units of measurement?

Graduate Are There Explanations for Solar Neutrino Anomalies and Hot Jupiters?