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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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Settlement on Moon: Artificial Gravity & Feasibility

Nov 13, 2005 · Replies 6 · Nov 15, 2005

Replies: 6

Views: 5K

Acceleration of charges at Big Bang

Nov 13, 2005 · Replies 10 · Nov 15, 2005

Replies: 10

Views: 3K

Does Gravitational Attraction Cause Energy Transfer Between Celestial Bodies?

Nov 14, 2005 · Replies 3 · Nov 14, 2005

Replies: 3

Views: 3K

What Do We Know About the Composition of Mars' Moons, Phobos and Deimos?

Nov 13, 2005 · Replies 2 · Nov 14, 2005

Replies: 2

Views: 3K

Gravitational Lensing: Why Does it Only Create Clones?

Nov 9, 2005 · Replies 13 · Nov 14, 2005

Replies: 13

Views: 3K

Models for Compactification from Inflation?

Jul 21, 2003 · Replies 2 · Nov 14, 2005

Replies: 2

Views: 4K

What Can You See With a Telescope During the Day?

Nov 14, 2005 · Replies 1 · Nov 14, 2005

Replies: 1

Views: 3K

Did Inflation Solve the Problem of the Universe's Original Gravity?

Nov 13, 2005 · Replies 7 · Nov 14, 2005

Replies: 7

Views: 4K

Seeing light from early Universe

Nov 9, 2005 · Replies 22 · Nov 13, 2005

Replies: 22

Views: 4K

Shrinking Universe: Visible Universe & Universal Center of Mass

Mar 10, 2005 · Replies 17 · Nov 13, 2005

Replies: 17

Views: 14K

There must be a center to it all.

Mar 21, 2004 · Replies 29 · Nov 13, 2005

Replies: 29

Views: 7K

Accuracy in Space: Can 10000kg Bolts & Nuts be Precisely Screwed?

Nov 8, 2005 · Replies 12 · Nov 13, 2005

Replies: 12

Views: 3K

Should The Galaxy Have Been Colonized By Now?

Oct 26, 2005 · Replies 65 · Nov 12, 2005

3

Replies: 65

Views: 9K

What Are the Chances of Different Physical Laws If We Restarted the Big Bang?

Nov 3, 2005 · Replies 25 · Nov 12, 2005

Replies: 25

Views: 4K

Can We Pinpoint the Direction of the Big Bang's Origin?

Nov 11, 2005 · Replies 6 · Nov 12, 2005

Replies: 6

Views: 3K

Is Dark Matter the Unruh effect applied to the acceleration of Gravity?

Nov 10, 2005 · Replies 3 · Nov 11, 2005

Replies: 3

Views: 5K

Poll

What Are the Implications of Being the First Intelligent Life in the Galaxy?

Nov 2, 2005 · Replies 39 · Nov 11, 2005

2

Replies: 39

Views: 6K

Could the Speed of Light be Calculated Differently?

Nov 11, 2005 · Replies 1 · Nov 11, 2005

Replies: 1

Views: 3K

Anyone care to guess the size/diameter of the Universe?

Nov 10, 2005 · Replies 10 · Nov 11, 2005

Replies: 10

Views: 3K

Preservation of Space: Is There a Model?

Oct 18, 2005 · Replies 9 · Nov 10, 2005

Replies: 9

Views: 3K

Mysterious Spin of the Moon: How Does it Change?

Nov 9, 2005 · Replies 5 · Nov 10, 2005

Replies: 5

Views: 4K

Energy Requirements for Compressing Matter into a Black Hole

Nov 6, 2005 · Replies 3 · Nov 9, 2005

Replies: 3

Views: 3K

Stargazing What features should beginners look for when purchasing a telescope?

Nov 5, 2005 · Replies 7 · Nov 9, 2005

Replies: 7

Views: 3K

Glass Planets: Common and Detectable in Our Galactic Neighborhood?

Nov 8, 2005 · Replies 1 · Nov 8, 2005

Replies: 1

Views: 2K

Why Does Venus Rotate Backwards?

Nov 4, 2005 · Replies 25 · Nov 8, 2005

Replies: 25

Views: 14K

What is the Truth about Black Holes and Light Holes?

Nov 4, 2005 · Replies 10 · Nov 8, 2005

Replies: 10

Views: 3K

Is There a Way to Distinguish Between Singularity and Matter in Black Holes?

Nov 3, 2005 · Replies 22 · Nov 8, 2005

Replies: 22

Views: 4K

Inside the Black Hole: Unravelling Its Mysteries

Nov 3, 2005 · Replies 17 · Nov 8, 2005

Replies: 17

Views: 4K

Why are geosynchronous orbirs in equatorial plane circular?

Oct 25, 2005 · Replies 13 · Nov 8, 2005

Replies: 13

Views: 5K

IS IT POSSIBLE TO CREATE A TRANSPARENT SHIELD FOR SPACE STATIONS?

Nov 8, 2005 · Replies 2 · Nov 8, 2005

Replies: 2

Views: 3K

Stargazing Telescope acting like microscope

Nov 8, 2005 · Replies 3 · Nov 8, 2005

Replies: 3

Views: 4K

Can White Holes Challenge the Second Law of Thermodynamics?

Nov 6, 2005 · Replies 4 · Nov 8, 2005

Replies: 4

Views: 2K

[stars] Nuclear Fuel usage rate

Sep 8, 2005 · Replies 26 · Nov 7, 2005

Replies: 26

Views: 9K

What Happens to the Universe if Omega Equals Exactly 1?

Nov 3, 2005 · Replies 3 · Nov 7, 2005

Replies: 3

Views: 3K

Stargazing Animation I made last night of Mars

Nov 3, 2005 · Replies 2 · Nov 7, 2005

Replies: 2

Views: 1K

Neutron Stars: Strong Force, Density & Black Holes

Nov 7, 2005 · Replies 3 · Nov 7, 2005

Replies: 3

Views: 6K

Is the Universe Truly Closed and Bound by Entropy?

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

Replies: 10

Views: 5K

Who here has calculated the dark energy density?

Nov 6, 2005 · Replies 0 · Nov 6, 2005

Replies: 0

Views: 3K

Could a Supernova Have Killed Off Mammoths?

Nov 4, 2005 · Replies 4 · Nov 6, 2005

Replies: 4

Views: 4K

Could the Big Bang Be a White Hole?

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

Replies: 19

Views: 26K

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

Nov 4, 2005 · Replies 5 · Nov 5, 2005

Replies: 5

Views: 4K

The maximum range of a missile_the earth is not flat

Nov 4, 2005 · Replies 1 · Nov 5, 2005

Replies: 1

Views: 3K

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

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

Replies: 12

Views: 7K

The Multiverse: A New Perspective on Our Existence

Nov 4, 2005 · Replies 7 · Nov 5, 2005

Replies: 7

Views: 3K

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

Photon, Gravity, Mass and Black Holes.

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

Replies: 17

Views: 5K

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

Are Traces of Earliest Stars Actually Detected?

Nov 3, 2005 · Replies 1 · Nov 3, 2005

Replies: 1

Views: 3K

Poll

Massive objects with super-solar metallicities at z~6

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

Replies: 14

Views: 3K

Poll

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: 10K

Poll

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

Specific definition of space in BB

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

Replies: 6

Views: 2K

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

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

Replies: 11

Views: 3K

An anomalous concentration of QSOs around NGC 3079

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

Replies: 11

Views: 3K

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

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

Replies: 10

Views: 3K

Lower mass = more elliptical orbit?

Nov 1, 2005 · Replies 5 · Nov 1, 2005

Replies: 5

Views: 3K

Big Bang Failures: Examining Scientific Method & Tech Impact

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

Replies: 13

Views: 4K

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

Heard the moon is moving away from us

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

Replies: 6

Views: 2K

CMBR - multiple detections of the same 'spots'?

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

Replies: 2

Views: 2K

How reliable are the redshift measurements from GRB 050904?

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

Replies: 17

Views: 5K

The Distribution of Dark Matter in Spirals

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

Replies: 9

Views: 3K

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

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

Could Gamma-ray Bursts Trigger Mass Extinctions?

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

Replies: 16

Views: 4K

How Do Scientists Counteract Radiation Pressure on Artificial Satellites?

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

Replies: 7

Views: 3K

Understanding Dark Matter: Theories and Effects on the Cosmos

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

3

Replies: 76

Views: 13K

Oscillating Universe: QG Theories on Gravity & Black Holes

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

Replies: 8

Views: 2K

Asteroseismic Analysis of Kepler Data

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

Replies: 16

Views: 9K

How Did the Big Bang Create Atoms?

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

2

Replies: 38

Views: 12K

Sir Fred Hoyle: Discovering Elements in Supernovae

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

Replies: 3

Views: 11K

Forming Planets & Life in Liquid Water

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

Replies: 2

Views: 2K

Are Stars Perfect Black Bodies or Just Approximations?

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

Replies: 4

Views: 2K

'First Light' and the Universe's early years

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

Replies: 25

Views: 6K

Begin Astronomy: Tips for £150 Telescope in England

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

Replies: 11

Views: 3K

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

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

Replies: 1

Views: 5K

IMF of First Stars: R. Schneider et al.

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

Replies: 12

Views: 3K

More about the Cooperstock and Tieu model

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

Replies: 9

Views: 3K

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

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

Replies: 2

Views: 3K

Is the Milky Way a Resonance-Ring Galaxy?

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

Replies: 13

Views: 4K

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

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

3

Replies: 67

Views: 12K

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

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

Replies: 1

Views: 3K

Star formation rates z=6 to z=10

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

Replies: 1

Views: 2K

Any such equation to relate spacetime to energy/mass

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

Replies: 8

Views: 3K

Converting from the horizontal system to the equatorial system

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

Replies: 1

Views: 6K

How Do I Solve These Complex Astronomy Problems?

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

Replies: 1

Views: 6K

Wraparound Universe: Is It Feasible?

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

Replies: 3

Views: 4K

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

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

Replies: 11

Views: 3K

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

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

Is the inernal energy of the universe decreasing?

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

Replies: 1

Views: 3K

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

Message in the Sky: The Mysteries of the Heavens

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

Replies: 2

Views: 2K

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

Reionization: A Primer on Early Universe Physics

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

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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