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Astronomy and Astrophysics Forum

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.

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Graduate Is the Universe Truly Closed and Bound by Entropy?

Sep 23, 2005 · Replies 10 · Nov 7, 2005

Replies: 10

Views: 5K

Graduate Who here has calculated the dark energy density?

Nov 6, 2005 · Replies 0 · Nov 6, 2005

Replies: 0

Views: 3K

Graduate Could a Supernova Have Killed Off Mammoths?

Nov 4, 2005 · Replies 4 · Nov 6, 2005

Replies: 4

Views: 4K

Graduate Could the Big Bang Be a White Hole?

Jun 28, 2003 · Replies 19 · Nov 5, 2005

Replies: 19

Views: 26K

Graduate What is the appropriateness of the term potential in general relativity?

Nov 4, 2005 · Replies 5 · Nov 5, 2005

Replies: 5

Views: 4K

Undergrad The maximum range of a missile_the earth is not flat

Nov 4, 2005 · Replies 1 · Nov 5, 2005

Replies: 1

Views: 3K

Undergrad Are There Tables Showing Distance vs. Red Shift of Stars?

Oct 27, 2005 · Replies 12 · Nov 5, 2005

Replies: 12

Views: 7K

Graduate The Multiverse: A New Perspective on Our Existence

Nov 4, 2005 · Replies 7 · Nov 5, 2005

Replies: 7

Views: 3K

High School What is the biggest star we know of?

Nov 4, 2005 · Replies 3 · Nov 5, 2005

Replies: 3

Views: 6K

Discovering Astrology: A Print-Friendly Guide to Understanding the Stars

Nov 1, 2005 · Replies 25 · Nov 4, 2005

Replies: 25

Views: 4K

Graduate Photon, Gravity, Mass and Black Holes.

Sep 18, 2005 · Replies 17 · Nov 4, 2005

Replies: 17

Views: 5K

Graduate Is the Universe Infinitely Old and What Would We Expect to See?

Oct 10, 2005 · Replies 49 · Nov 4, 2005

2

Replies: 49

Views: 10K

Graduate Are Traces of Earliest Stars Actually Detected?

Nov 3, 2005 · Replies 1 · Nov 3, 2005

Replies: 1

Views: 3K

Poll

Graduate Massive objects with super-solar metallicities at z~6

Oct 29, 2005 · Replies 14 · Nov 3, 2005

Replies: 14

Views: 3K

Poll

Graduate Is the Universe Finite or Infinite? A Poll on the Current Debate in Cosmology

May 13, 2003 · Replies 28 · Nov 3, 2005

Replies: 28

Views: 11K

Poll

Graduate Could Nucleonic Forces Hold the Key to Solving the Dark Matter Mystery?

Oct 7, 2005 · Replies 30 · Nov 3, 2005

2

Replies: 30

Views: 5K

Undergrad Specific definition of space in BB

Oct 29, 2005 · Replies 6 · Nov 3, 2005

Replies: 6

Views: 3K

Stargazing Are There Non-Photonic 'Telescopes' for Studying Astrophysical Objects?

Oct 30, 2005 · Replies 11 · Nov 2, 2005

Replies: 11

Views: 3K

Graduate An anomalous concentration of QSOs around NGC 3079

Oct 31, 2005 · Replies 11 · Nov 2, 2005

Replies: 11

Views: 3K

Graduate Values of an rms speed of hydrogen atoms in the observable universe?

Oct 28, 2005 · Replies 10 · Nov 1, 2005

Replies: 10

Views: 3K

High School Lower mass = more elliptical orbit?

Nov 1, 2005 · Replies 5 · Nov 1, 2005

Replies: 5

Views: 3K

Graduate Big Bang Failures: Examining Scientific Method & Tech Impact

Oct 29, 2005 · Replies 13 · Oct 31, 2005

Replies: 13

Views: 4K

High School What Is the Fuel That Stars Run Out of Before Becoming Black Holes?

Oct 30, 2005 · Replies 5 · Oct 31, 2005

Replies: 5

Views: 3K

High School Heard the moon is moving away from us

Oct 25, 2005 · Replies 6 · Oct 31, 2005

Replies: 6

Views: 2K

Graduate CMBR - multiple detections of the same 'spots'?

Oct 30, 2005 · Replies 2 · Oct 31, 2005

Replies: 2

Views: 2K

Graduate How reliable are the redshift measurements from GRB 050904?

Oct 14, 2005 · Replies 17 · Oct 31, 2005

Replies: 17

Views: 5K

Graduate The Distribution of Dark Matter in Spirals

Oct 6, 2005 · Replies 9 · Oct 30, 2005

Replies: 9

Views: 3K

High School What is the Maximum Possible Length of a Radio Wave?

Oct 6, 2005 · Replies 14 · Oct 30, 2005

Replies: 14

Views: 8K

Get Ready for a Rare Mars Flyby: Second Closest Approach in 60,000 Years!

Oct 27, 2005 · Replies 7 · Oct 30, 2005

Replies: 7

Views: 3K

Undergrad Where Does the First Second of the Universe Fall on the Time Line?

Oct 29, 2005 · Replies 2 · Oct 30, 2005

Replies: 2

Views: 4K

Graduate Could Gamma-ray Bursts Trigger Mass Extinctions?

Oct 20, 2005 · Replies 16 · Oct 29, 2005

Replies: 16

Views: 4K

Undergrad How Do Scientists Counteract Radiation Pressure on Artificial Satellites?

Oct 26, 2005 · Replies 7 · Oct 29, 2005

Replies: 7

Views: 3K

Undergrad Understanding Dark Matter: Theories and Effects on the Cosmos

Oct 12, 2005 · Replies 76 · Oct 29, 2005

3

Replies: 76

Views: 13K

Graduate Oscillating Universe: QG Theories on Gravity & Black Holes

Oct 28, 2005 · Replies 8 · Oct 29, 2005

Replies: 8

Views: 3K

Graduate Asteroseismic Analysis of Kepler Data

Dec 30, 2004 · Replies 16 · Oct 28, 2005

Replies: 16

Views: 9K

Undergrad How Did the Big Bang Create Atoms?

Sep 15, 2005 · Replies 38 · Oct 28, 2005

2

Replies: 38

Views: 12K

High School Sir Fred Hoyle: Discovering Elements in Supernovae

Oct 28, 2005 · Replies 3 · Oct 28, 2005

Replies: 3

Views: 11K

High School Forming Planets & Life in Liquid Water

Oct 28, 2005 · Replies 2 · Oct 28, 2005

Replies: 2

Views: 2K

Undergrad Are Stars Perfect Black Bodies or Just Approximations?

Oct 28, 2005 · Replies 4 · Oct 28, 2005

Replies: 4

Views: 2K

Graduate 'First Light' and the Universe's early years

Oct 21, 2005 · Replies 25 · Oct 28, 2005

Replies: 25

Views: 6K

High School Begin Astronomy: Tips for £150 Telescope in England

Oct 26, 2005 · Replies 11 · Oct 27, 2005

Replies: 11

Views: 3K

Graduate What is the current state of the universe and its expansion?

Oct 27, 2005 · Replies 1 · Oct 27, 2005

Replies: 1

Views: 5K

Graduate IMF of First Stars: R. Schneider et al.

Oct 25, 2005 · Replies 12 · Oct 27, 2005

Replies: 12

Views: 3K

Graduate More about the Cooperstock and Tieu model

Oct 27, 2005 · Replies 9 · Oct 27, 2005

Replies: 9

Views: 3K

Graduate What Are the Libration Points in the Mars, Phobos, and Deimos System?

Oct 26, 2005 · Replies 2 · Oct 26, 2005

Replies: 2

Views: 3K

Undergrad Is the Milky Way a Resonance-Ring Galaxy?

Aug 16, 2005 · Replies 13 · Oct 26, 2005

Replies: 13

Views: 5K

Undergrad New study shows Dark Matter isn't needed? Relativty explains it?

Oct 11, 2005 · Replies 67 · Oct 26, 2005

3

Replies: 67

Views: 12K

Undergrad Why Do All Galaxies Have a Supermassive Black Hole at Their Centre?

Oct 26, 2005 · Replies 1 · Oct 26, 2005

Replies: 1

Views: 3K

Graduate Star formation rates z=6 to z=10

Oct 26, 2005 · Replies 1 · Oct 26, 2005

Replies: 1

Views: 2K

Graduate Any such equation to relate spacetime to energy/mass

Aug 6, 2005 · Replies 8 · Oct 25, 2005

Replies: 8

Views: 3K

Undergrad Converting from the horizontal system to the equatorial system

Oct 23, 2005 · Replies 1 · Oct 24, 2005

Replies: 1

Views: 6K

Graduate How Do I Solve These Complex Astronomy Problems?

Oct 24, 2005 · Replies 1 · Oct 24, 2005

Replies: 1

Views: 6K

Graduate Wraparound Universe: Is It Feasible?

Oct 21, 2005 · Replies 3 · Oct 24, 2005

Replies: 3

Views: 4K

Graduate New study shows Dark Energy isn't needed? Relativty explains it?

Oct 19, 2005 · Replies 11 · Oct 22, 2005

Replies: 11

Views: 3K

Undergrad How do scientists put satellites into space

Oct 21, 2005 · Replies 5 · Oct 21, 2005

Replies: 5

Views: 3K

Stargazing How can stacking improve astrophotography?

Oct 18, 2005 · Replies 3 · Oct 21, 2005

Replies: 3

Views: 1K

Undergrad How can I determine orbital elements using observations of an asteroid's motion?

Aug 22, 2005 · Replies 2 · Oct 21, 2005

Replies: 2

Views: 5K

Undergrad Is the inernal energy of the universe decreasing?

Oct 20, 2005 · Replies 1 · Oct 20, 2005

Replies: 1

Views: 3K

Graduate What Challenges Did I Face in Capturing Images of the Andromeda Galaxy and Mars?

Oct 20, 2005 · Replies 0 · Oct 20, 2005

Replies: 0

Views: 2K

Find Out Who Has a Myspace Page on PF - Share Your Addiction!

Oct 19, 2005 · Replies 5 · Oct 19, 2005

Replies: 5

Views: 3K

Graduate Message in the Sky: The Mysteries of the Heavens

Oct 19, 2005 · Replies 2 · Oct 19, 2005

Replies: 2

Views: 2K

Undergrad Superman Holding the Moon: Is It an Impressive Feat?

Oct 15, 2005 · Replies 8 · Oct 19, 2005

Replies: 8

Views: 4K

Viewing Moon & Milky Way: Best Time & Rare Events

Oct 17, 2005 · Replies 3 · Oct 18, 2005

Replies: 3

Views: 2K

Graduate Reionization: A Primer on Early Universe Physics

Oct 17, 2005 · Replies 1 · Oct 17, 2005

Replies: 1

Views: 2K

Undergrad Deriving Equations for Moon's Orbital Acceleration

Oct 16, 2005 · Replies 1 · Oct 16, 2005

Replies: 1

Views: 7K

Graduate Quickie: CP and power spectrum of the CMB

Oct 14, 2005 · Replies 11 · Oct 16, 2005

Replies: 11

Views: 4K

Undergrad Exploring the Habitable Zone and Tidal Lock in Exoplanet Systems

Oct 15, 2005 · Replies 1 · Oct 16, 2005

Replies: 1

Views: 5K

Undergrad How Do You Determine Visible Right Ascension and Declination Coordinates?

Oct 8, 2005 · Replies 15 · Oct 15, 2005

Replies: 15

Views: 11K

Graduate Star Formation: Density, Temperature & Fusion

Oct 14, 2005 · Replies 4 · Oct 15, 2005

Replies: 4

Views: 3K

High School How Does the Size of an Eclipsing Planet Affect Star Brightness?

Oct 13, 2005 · Replies 4 · Oct 15, 2005

Replies: 4

Views: 2K

Graduate Learning About the Three Body Problem & Hamiltonian Systems

Oct 13, 2005 · Replies 1 · Oct 14, 2005

Replies: 1

Views: 5K

Undergrad How does the cosmic background radiation works

Oct 11, 2005 · Replies 2 · Oct 14, 2005

Replies: 2

Views: 2K

Undergrad Weak and strong anthropic principle

Oct 10, 2005 · Replies 17 · Oct 13, 2005

Replies: 17

Views: 5K

High School Observing Unusual Red Star in Scorpius Constellation

Oct 13, 2005 · Replies 2 · Oct 13, 2005

Replies: 2

Views: 3K

Undergrad What Would Happen to Gravity If Earth Stopped Spinning?

Oct 13, 2005 · Replies 3 · Oct 13, 2005

Replies: 3

Views: 3K

Undergrad Calculating Space Probe Trip to Neptune with Jupiter Assist

Oct 11, 2005 · Replies 2 · Oct 12, 2005

Replies: 2

Views: 4K

Undergrad Gravitational effect of sun on earth

Oct 9, 2004 · Replies 13 · Oct 12, 2005

Replies: 13

Views: 21K

Graduate Where are the real definitions of homogeneity and isotropy?

Sep 29, 2005 · Replies 26 · Oct 12, 2005

Replies: 26

Views: 7K

Graduate Has Dark Matter's Mystery Finally Been Solved?

Oct 6, 2005 · Replies 43 · Oct 11, 2005

2

Replies: 43

Views: 7K

Graduate What Would Happen if You Tried to Move Beyond the Edge of the Universe?

Oct 8, 2005 · Replies 17 · Oct 11, 2005

Replies: 17

Views: 5K

Undergrad How Are Planets Detected Through Transit Method?

Oct 9, 2005 · Replies 1 · Oct 11, 2005

Replies: 1

Views: 2K

Undergrad What Are Physical Symmetries and How Do Particles Transform?

Oct 9, 2005 · Replies 6 · Oct 10, 2005

Replies: 6

Views: 2K

Blackhole gulps down Neutron Star

Oct 10, 2005 · Replies 1 · Oct 10, 2005

Replies: 1

Views: 2K

Graduate Semi-pop review of structure of universe

Oct 9, 2005 · Replies 1 · Oct 10, 2005

Replies: 1

Views: 2K

Graduate UV Galaxy Surface brightness says no expansion

Sep 21, 2005 · Replies 30 · Oct 10, 2005

2

Replies: 30

Views: 7K

Graduate The Apollo Laser Ranger Retroreflector Experiment

Sep 29, 2005 · Replies 10 · Oct 9, 2005

Replies: 10

Views: 5K

High School Is NASA's Future Tied to Russian Spacecraft?

Oct 8, 2005 · Replies 13 · Oct 8, 2005

Replies: 13

Views: 2K

Undergrad Heat of objects entering an atmosphere?

Oct 8, 2005 · Replies 2 · Oct 8, 2005

Replies: 2

Views: 4K

Undergrad What Day Will You See the Same Star Rise at 10:40pm?

Oct 8, 2005 · Replies 5 · Oct 8, 2005

Replies: 5

Views: 7K

Graduate Dark matter highlights extra dimensions

Sep 5, 2005 · Replies 38 · Oct 7, 2005

2

Replies: 38

Views: 6K

Stargazing Did I finally capture decent pictures of Mars and other celestial objects?

Sep 21, 2005 · Replies 4 · Oct 7, 2005

Replies: 4

Views: 1K

Graduate Understanding Object Movement in Space: Factors Affecting Speed Between Galaxies

Oct 5, 2005 · Replies 2 · Oct 6, 2005

Replies: 2

Views: 8K

High School Where Can Beginners Find Good Astrophysics Websites?

Oct 4, 2005 · Replies 2 · Oct 5, 2005

Replies: 2

Views: 3K

Very Large Telescope Project - Amazing Images

Oct 4, 2005 · Replies 2 · Oct 4, 2005

Replies: 2

Views: 5K

Graduate The Susskind Counter Information Paradox?

Sep 15, 2005 · Replies 7 · Oct 4, 2005

Replies: 7

Views: 7K

Undergrad Saturn's Moon Iapetus: Big Wall & Geology Mystery

Sep 29, 2005 · Replies 8 · Oct 4, 2005

Replies: 8

Views: 3K

New Planet "Xena" and it's moon is "Gabrielle"

Oct 3, 2005 · Replies 7 · Oct 4, 2005

Replies: 7

Views: 6K

High School Discover the Innovative Space Ladder Technology | Learn More Now!

Sep 28, 2005 · Replies 27 · Oct 3, 2005

Replies: 27

Views: 7K

Graduate No problem, always happy to provide some clarification.

Oct 1, 2005 · Replies 9 · Oct 2, 2005

Replies: 9

Views: 3K

Undergrad Is the LuniSolar theory a legitimate scientific theory?

Oct 1, 2005 · Replies 1 · Oct 1, 2005

Replies: 1

Views: 11K

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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