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Astronomy, Astrophysics, Cosmology Forum

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.

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Favorite Prominent / Professional Astrophotographers

Apr 7, 2015 · Replies 2 · Apr 8, 2015

Replies: 2

Views: 1K

Graduate Did the universe have a begining?

Apr 7, 2015 · Replies 9 · Apr 7, 2015

Replies: 9

Views: 2K

Graduate How is Dark Energy Density Calculated in the Universe?

Apr 2, 2015 · Replies 16 · Apr 7, 2015

Replies: 16

Views: 5K

High School Does space-time have an energy itself?

Apr 4, 2015 · Replies 59 · Apr 7, 2015

2

Replies: 59

Views: 7K

Graduate Death of Sun: Habitable Zone & Timeline

Mar 26, 2015 · Replies 8 · Apr 7, 2015

Replies: 8

Views: 4K

Graduate Should the concept of Falsifiability be abandoned in science?

Apr 2, 2015 · Replies 22 · Apr 7, 2015

Replies: 22

Views: 4K

Graduate Why are there stars that are "older than the universe"?

Apr 6, 2015 · Replies 4 · Apr 7, 2015

Replies: 4

Views: 3K

Graduate Cosmological vs. Relativistic Doppler Shift

Mar 22, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

Undergrad Doubt About Hour Angle: How Can It Change So Little?

Apr 6, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

High School Constant acceleration of gravity

Apr 5, 2015 · Replies 2 · Apr 6, 2015

Replies: 2

Views: 1K

Graduate When did relic neutrinos cease being relativistic?

Apr 5, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

High School Understanding Gravitational Pull and Its Effects on Humans

Mar 29, 2015 · Replies 12 · Apr 5, 2015

Replies: 12

Views: 3K

Graduate Galaxy Merger Energy: Calculating Total System Energy

Apr 5, 2015 · Replies 8 · Apr 5, 2015

Replies: 8

Views: 2K

Graduate Explanation for similar structures at different scales

Apr 5, 2015 · Replies 2 · Apr 5, 2015

Replies: 2

Views: 1K

Undergrad Understanding Big R(t) in Astronomy: A Physical Perspective

Apr 3, 2015 · Replies 7 · Apr 4, 2015

Replies: 7

Views: 3K

Graduate Is Dark Energy a Misinterpreted Phenomenon?

Apr 3, 2015 · Replies 10 · Apr 4, 2015

Replies: 10

Views: 2K

Graduate Julian Ephemeris Date from Ephemeris Time

Apr 3, 2015 · Replies 1 · Apr 3, 2015

Replies: 1

Views: 8K

Undergrad What's the nothingness that our universe is expanding into?

Mar 24, 2015 · Replies 76 · Apr 3, 2015

3

Replies: 76

Views: 15K

Graduate Gravitational entropy in the early universe

Apr 2, 2015 · Replies 7 · Apr 3, 2015

Replies: 7

Views: 3K

Graduate What is the relationship between orbital semi latus rectum and angular momentum?

Apr 2, 2015 · Replies 3 · Apr 3, 2015

Replies: 3

Views: 5K

Undergrad Why does the Sun behave like a black body?

Mar 24, 2015 · Replies 32 · Apr 3, 2015

2

Replies: 32

Views: 20K

Graduate Bending of space and time, is it true?

Mar 28, 2015 · Replies 71 · Apr 2, 2015

3

Replies: 71

Views: 8K

Graduate How Can We Harness the Power of Space Elevators and Atmospheric Electricity?

Mar 31, 2015 · Replies 7 · Apr 2, 2015

Replies: 7

Views: 3K

Graduate Black holes in the globular cluster M22 with Dr. Tom Maccarone

Mar 30, 2015 · Replies 12 · Apr 2, 2015

Replies: 12

Views: 4K

Graduate Calculating Surface Density of the Universe Using the Shell Model

Mar 27, 2015 · Replies 7 · Apr 2, 2015

Replies: 7

Views: 3K

Undergrad Friedmann's Assumption: Understanding the Universe's Uniformity

Mar 28, 2015 · Replies 44 · Apr 2, 2015

2

Replies: 44

Views: 5K

High School Planetary Alignment: Mercury Out of Sync

Mar 28, 2015 · Replies 12 · Apr 1, 2015

Replies: 12

Views: 3K

Graduate Size of observable vs UN-observable Universe, etc

Apr 1, 2015 · Replies 3 · Apr 1, 2015

Replies: 3

Views: 4K

Graduate What can you learn about cosmology from Google calculator?

Mar 16, 2015 · Replies 111 · Apr 1, 2015

4

Replies: 111

Views: 12K

Stargazing Is this a realistic design for a kilometer wide telescope?

Mar 30, 2015 · Replies 14 · Apr 1, 2015

Replies: 14

Views: 5K

Graduate Scientific importance of total Solar eclipses?

Mar 31, 2015 · Replies 10 · Mar 31, 2015

Replies: 10

Views: 3K

Graduate The Potential of Titan: Igniting Methane Oceans for Photosynthesis

Mar 29, 2015 · Replies 34 · Mar 31, 2015

2

Replies: 34

Views: 5K

High School Do we all belong to the same star?

Mar 29, 2015 · Replies 7 · Mar 30, 2015

Replies: 7

Views: 2K

Graduate Role of quantum mechanics in cosmology

Mar 30, 2015 · Replies 11 · Mar 30, 2015

Replies: 11

Views: 2K

Graduate Latest News from the Universe: CDM vs WDM and the Future of Dark Matter Models

Mar 30, 2015 · Replies 5 · Mar 30, 2015

Replies: 5

Views: 2K

Graduate Boltzmann equation Kinetic equilibrium (Dodelson)

Mar 25, 2015 · Replies 1 · Mar 30, 2015

Replies: 1

Views: 2K

Undergrad Proof to Kepler's first and second laws

Mar 30, 2015 · Replies 3 · Mar 30, 2015

Replies: 3

Views: 2K

Graduate Analogy for recession of galaxies > the speed of light

Mar 29, 2015 · Replies 8 · Mar 29, 2015

Replies: 8

Views: 2K

Stargazing Understanding reflecting telescopes?

Mar 28, 2015 · Replies 6 · Mar 29, 2015

Replies: 6

Views: 4K

Undergrad How wide is the observable horizon, at sea level?

Mar 27, 2015 · Replies 10 · Mar 29, 2015

Replies: 10

Views: 15K

Graduate High redshift galaxies in the HUDF

Mar 28, 2015 · Replies 1 · Mar 29, 2015

Replies: 1

Views: 2K

Graduate Fundamental Relationship Between Time and Space Derivatives

Mar 28, 2015 · Replies 6 · Mar 29, 2015

Replies: 6

Views: 4K

Undergrad What is the center of a globular clusters made of?

Feb 12, 2015 · Replies 50 · Mar 28, 2015

2

Replies: 50

Views: 9K

Graduate Forming Stars: 2 Conditions and Criteria Explained

Mar 18, 2015 · Replies 5 · Mar 28, 2015

Replies: 5

Views: 2K

Graduate Our universe as an expanding sponge that is constantly falling.

Mar 28, 2015 · Replies 6 · Mar 28, 2015

Replies: 6

Views: 2K

Graduate Do M or string theory imply a lower limit to size?

Mar 27, 2015 · Replies 4 · Mar 28, 2015

Replies: 4

Views: 1K

Graduate Classifying Exoplanets: Size & Surface Temperature

Mar 22, 2015 · Replies 6 · Mar 27, 2015

Replies: 6

Views: 4K

Undergrad How Can We Reach Habitable Exoplanets?

Mar 27, 2015 · Replies 8 · Mar 27, 2015

Replies: 8

Views: 2K

Graduate Supernova prediction: SN Refsdal

Mar 27, 2015 · Replies 1 · Mar 27, 2015

Replies: 1

Views: 1K

Undergrad Exoplanet Eccentricity vs Orbital Period

Mar 27, 2015 · Replies 5 · Mar 27, 2015

Replies: 5

Views: 3K

Undergrad Saturn Day Shorter Than Expected | Ken Croswell | Science

Mar 25, 2015 · Replies 4 · Mar 27, 2015

Replies: 4

Views: 2K

Is the Hubble Telescope Smiling at a Gravitational Lens?

Feb 18, 2015 · Replies 12 · Mar 27, 2015

Replies: 12

Views: 2K

Stargazing How Do Lasers Work in Telescopes to Capture Images of the Universe?

Mar 25, 2015 · Replies 3 · Mar 27, 2015

Replies: 3

Views: 2K

High School Fake magnification and other information

Feb 25, 2015 · Replies 6 · Mar 27, 2015

Replies: 6

Views: 2K

Graduate Redshift of supernova light curve

Mar 26, 2015 · Replies 10 · Mar 27, 2015

Replies: 10

Views: 2K

Stargazing Understanding the Field of View of Reflecting and Refracting Telescopes

Mar 26, 2015 · Replies 9 · Mar 27, 2015

Replies: 9

Views: 7K

Graduate Question on possible dark matter classification

Mar 26, 2015 · Replies 9 · Mar 27, 2015

Replies: 9

Views: 2K

Undergrad Question about spectral lines of stars?

Mar 27, 2015 · Replies 3 · Mar 27, 2015

Replies: 3

Views: 2K

Graduate Feedback and equilibrium between black holes and galaxies

Mar 25, 2015 · Replies 4 · Mar 27, 2015

Replies: 4

Views: 1K

Graduate How can you show the CMB shift parameter?

Mar 24, 2015 · Replies 7 · Mar 27, 2015

Replies: 7

Views: 3K

I got a bad feelin' about this Chewie turn us around

Mar 25, 2015 · Replies 4 · Mar 26, 2015

Replies: 4

Views: 2K

Stargazing Quick question about telescope classification

Mar 26, 2015 · Replies 3 · Mar 26, 2015

Replies: 3

Views: 2K

Graduate Covariance betw scalar amplitude & spectral index in Planck?

Mar 23, 2015 · Replies 2 · Mar 26, 2015

Replies: 2

Views: 2K

Graduate Black Holes & Galaxies: How Do They Work Together?

Mar 25, 2015 · Replies 3 · Mar 26, 2015

Replies: 3

Views: 3K

Graduate Cosmological Constant and Vacuum Energy

Mar 25, 2015 · Replies 5 · Mar 25, 2015

Replies: 5

Views: 2K

Graduate What does a temporally infinite universe imply?

Mar 25, 2015 · Replies 1 · Mar 25, 2015

Replies: 1

Views: 2K

Graduate Could a Collapsing Black Hole Be the Origin of Our Universe?

Mar 25, 2015 · Replies 9 · Mar 25, 2015

Replies: 9

Views: 2K

Stargazing Viewing stars through a refracting telescope?

Mar 25, 2015 · Replies 2 · Mar 25, 2015

Replies: 2

Views: 3K

High School Are Jupiter's bands visible with binoculars?

Mar 11, 2015 · Replies 17 · Mar 24, 2015

Replies: 17

Views: 6K

Graduate What supported the singularity during the Big Bang?

Mar 24, 2015 · Replies 7 · Mar 24, 2015

Replies: 7

Views: 3K

How Did I Capture Orion and Comet Lovejoy in Arizona?

Mar 22, 2015 · Replies 4 · Mar 24, 2015

Replies: 4

Views: 2K

Undergrad Why is the universe considered to be flat?

Mar 24, 2015 · Replies 3 · Mar 24, 2015

Replies: 3

Views: 2K

Graduate Supernova Explosion near a black hole

Mar 23, 2015 · Replies 7 · Mar 24, 2015

Replies: 7

Views: 2K

High School Measuring Light Years: How Far Is the Andromeda Galaxy?

Mar 23, 2015 · Replies 3 · Mar 24, 2015

Replies: 3

Views: 2K

Graduate Entire universe ending with a supermassive black hole?

Mar 20, 2015 · Replies 10 · Mar 24, 2015

Replies: 10

Views: 3K

Graduate Static universe, spacetime and the stress-energy tensor

Mar 22, 2015 · Replies 13 · Mar 24, 2015

Replies: 13

Views: 2K

Undergrad Please explain the statement "the big bang happened everywhere at once"

Nov 11, 2014 · Replies 154 · Mar 24, 2015

6

Replies: 154

Views: 19K

Graduate How do scientists estimate the total energy of the universe?

Mar 23, 2015 · Replies 15 · Mar 24, 2015

Replies: 15

Views: 3K

Graduate What are Branes? Explained Simply

Jan 17, 2015 · Replies 5 · Mar 23, 2015

Replies: 5

Views: 2K

Graduate Dark energy and the Cosmological Constant

Mar 15, 2015 · Replies 37 · Mar 23, 2015

2

Replies: 37

Views: 5K

Did You Capture the March 17 Aurora Borealis?

Mar 22, 2015 · Replies 2 · Mar 23, 2015

Replies: 2

Views: 1K

Graduate Eccentric & Mean Anomaly: Difference & Drawing

Mar 23, 2015 · Replies 2 · Mar 23, 2015

Replies: 2

Views: 3K

What Is the Significance of the Solar Eclipse on March 20, 2015?

Mar 19, 2015 · Replies 13 · Mar 23, 2015

Replies: 13

Views: 2K

Feeling insignificant after watching space movies

Mar 21, 2015 · Replies 10 · Mar 22, 2015

Replies: 10

Views: 2K

Undergrad Multiple universes: Nothing more than philosophising?

Mar 5, 2015 · Replies 46 · Mar 22, 2015

2

Replies: 46

Views: 6K

Undergrad Why are the more distant galaxies/stars moving faster away?

Mar 22, 2015 · Replies 29 · Mar 22, 2015

Replies: 29

Views: 8K

High School Can someone explain what it is meant by a 'Flat Universe'?

Mar 21, 2015 · Replies 25 · Mar 22, 2015

Replies: 25

Views: 5K

Amazing shot of a meteor over Loch Ness

Mar 18, 2015 · Replies 6 · Mar 21, 2015

Replies: 6

Views: 2K

Graduate Tidal lock and landmass on a Earth-like planet

Mar 21, 2015 · Replies 1 · Mar 21, 2015

Replies: 1

Views: 2K

Graduate How do we know Inflation begin in 10^-35 second?

Mar 21, 2015 · Replies 3 · Mar 21, 2015

Replies: 3

Views: 2K

Meteor trajectories -- Interested in computing them?

Mar 20, 2015 · Replies 4 · Mar 21, 2015

Replies: 4

Views: 2K

Graduate John Seach Discovers 6.0 Mag Nova in Sagittarius, NSW, Australia

Mar 19, 2015 · Replies 2 · Mar 20, 2015

Replies: 2

Views: 2K

Graduate Water vapor observed venting from Ceres

Jan 22, 2014 · Replies 6 · Mar 20, 2015

Replies: 6

Views: 4K

Undergrad Rare Plume on Mars: A Mystery Baffling Scientists

Feb 16, 2015 · Replies 3 · Mar 20, 2015

Replies: 3

Views: 2K

Graduate Pre-Big Bang Space-Time: A Possibility or a Speculation?

Mar 19, 2015 · Replies 6 · Mar 19, 2015

Replies: 6

Views: 2K

Graduate Could the Universe be Shrinking Instead of Expanding?

Mar 28, 2013 · Replies 22 · Mar 19, 2015

Replies: 22

Views: 5K

Graduate The First Three Minutes - Steven Weinberg

Mar 16, 2015 · Replies 8 · Mar 19, 2015

Replies: 8

Views: 2K

Undergrad What is the evidence for an accelerated expanding universe

Mar 12, 2015 · Replies 22 · Mar 19, 2015

Replies: 22

Views: 3K

Graduate The Holographic Principle: Separating Fact from Fiction

Mar 18, 2015 · Replies 3 · Mar 18, 2015

Replies: 3

Views: 2K

Graduate Dark Energy Evolution: Is $\Lambda$CDM Model the Best?

Mar 18, 2015 · Replies 1 · Mar 18, 2015

Replies: 1

Views: 2K

Astronomy

Astronomy is the scientific study of celestial objects and phenomena beyond Earth's atmosphere. It encompasses the observation and analysis of stars, planets, galaxies, and other celestial bodies, as well as the broader exploration of the universe's origins, structure, and evolution.

Astronomers employ a variety of tools, including telescopes, satellites, and advanced instrumentation, to gather data and uncover the mysteries of the cosmos. The field addresses questions about the nature of dark matter, the expansion of the universe, and the potential for extraterrestrial life.

Astronomy not only contributes to our understanding of the cosmos but also inspires wonder and curiosity about the vastness and complexity of the universe we inhabit.

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