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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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How does the Virial Theorem derivation for <K>=-<delta(U)> work?

Jan 17, 2008 · Replies 2 · Jan 18, 2008

Replies: 2

Views: 8K

Typical stellar distances of visible stars in the Milky Way

Jan 15, 2008 · Replies 4 · Jan 16, 2008

Replies: 4

Views: 5K

Questions about Zhumell 3x Barlow for 12" Dobsonian Telescope

Jan 15, 2008 · Replies 2 · Jan 15, 2008

Replies: 2

Views: 3K

Mars Express Images from ESA's Mars spacecraft

Jan 13, 2008 · Replies 1 · Jan 13, 2008

Replies: 1

Views: 3K

Could I Have Seen the Horsehead?

Jan 12, 2008 · Replies 5 · Jan 13, 2008

Replies: 5

Views: 4K

What happens to atoms when they enter a black hole?

Jan 12, 2008 · Replies 2 · Jan 12, 2008

Replies: 2

Views: 3K

Did supernovae have anything to do with the solar creation?

Jan 12, 2008 · Replies 8 · Jan 12, 2008

Replies: 8

Views: 3K

Is NASA prepared for a potential Mars-impacting asteroid?

Dec 23, 2007 · Replies 20 · Jan 11, 2008

Replies: 20

Views: 7K

Noise Removal in Radio Telescope Observations

Jan 1, 2008 · Replies 7 · Jan 11, 2008

Replies: 7

Views: 5K

Was the Dust Cloud Surrounding Proto-Earth Hot or Cold?

Dec 21, 2007 · Replies 12 · Jan 11, 2008

Replies: 12

Views: 6K

What would make a star flash red and blue?

Jan 11, 2008 · Replies 1 · Jan 11, 2008

Replies: 1

Views: 6K

Can Black Holes Really Rip Apart Atoms and Light?

Jan 11, 2008 · Replies 1 · Jan 11, 2008

Replies: 1

Views: 4K

Is it possible for a black hole to eat an entire galaxy?

Jan 11, 2008 · Replies 3 · Jan 11, 2008

Replies: 3

Views: 5K

Unveiling the Mysteries of Quasars and their Energetic Emissions

Jun 28, 2005 · Replies 13 · Jan 11, 2008

Replies: 13

Views: 7K

Can gas giants like Jupiter become stars and create a binary solar system?

Jan 6, 2008 · Replies 3 · Jan 9, 2008

Replies: 3

Views: 6K

Can black holes absorb at an infinite rate?

Jan 9, 2008 · Replies 5 · Jan 9, 2008

Replies: 5

Views: 3K

Why gas giants were created far from the Sun?

Jan 9, 2008 · Replies 8 · Jan 9, 2008

Replies: 8

Views: 9K

The Mysterious Plane of Planetary Orbits

Jan 9, 2008 · Replies 3 · Jan 9, 2008

Replies: 3

Views: 4K

Help me im in WAS and i need to know Delta V. .

Jan 7, 2008 · Replies 8 · Jan 8, 2008

Replies: 8

Views: 3K

MY SPACE website - packed with talentless people?

Dec 31, 2007 · Replies 9 · Jan 8, 2008

Replies: 9

Views: 3K

Gliese 581c/d and their Red Sun?

Jan 8, 2008 · Replies 4 · Jan 8, 2008

Replies: 4

Views: 5K

Freakiest things in our solar system

Dec 21, 2007 · Replies 15 · Jan 8, 2008

Replies: 15

Views: 7K

Can you help me have a general view on cosmology and astrophysics?

Jan 5, 2008 · Replies 5 · Jan 7, 2008

Replies: 5

Views: 3K

What Did We Find on Titan?

May 17, 2007 · Replies 8 · Jan 7, 2008

Replies: 8

Views: 7K

Stargazing Which Telescope Should a Beginner Buy?

Jan 5, 2008 · Replies 2 · Jan 6, 2008

Replies: 2

Views: 3K

Will the Universe Really End Up Filled with Black Holes?

Dec 26, 2007 · Replies 4 · Jan 5, 2008

Replies: 4

Views: 3K

How do we overcome the challenges of sending humans to the moon and Mars?

Jan 4, 2008 · Replies 3 · Jan 4, 2008

Replies: 3

Views: 4K

Q&A on Orbits: Throwing Balls in Space

Jan 4, 2008 · Replies 6 · Jan 4, 2008

Replies: 6

Views: 3K

An Introduction to Black Hole Thermodynamics

Oct 28, 2003 · Replies 16 · Jan 4, 2008

Replies: 16

Views: 6K

Annoying nitpicking: has the geocentric view of the solar system been refuted?

Jan 1, 2008 · Replies 17 · Jan 2, 2008

Replies: 17

Views: 6K

Gravity's Effect on Universe Expansion: Dark Energy?

Jan 1, 2008 · Replies 1 · Jan 1, 2008

Replies: 1

Views: 3K

Why Is My Zhumell Dobsonian's Laser Collimator Missing the Secondary Mirror?

Dec 31, 2007 · Replies 2 · Jan 1, 2008

Replies: 2

Views: 3K

What is the average mass a black hole consumes

Dec 21, 2007 · Replies 3 · Jan 1, 2008

Replies: 3

Views: 5K

Why do gas planets not collapse?

Dec 30, 2007 · Replies 1 · Dec 30, 2007

Replies: 1

Views: 5K

Weins Displacement Law: Calculating Max Wavelength & Frequency

Dec 26, 2007 · Replies 1 · Dec 28, 2007

Replies: 1

Views: 5K

Why Does Gravitational Time Dilation Decrease With Distance?

Dec 27, 2007 · Replies 1 · Dec 28, 2007

Replies: 1

Views: 4K

Do Black Holes Emit Heat Due to Movement?

Dec 17, 2007 · Replies 5 · Dec 27, 2007

Replies: 5

Views: 3K

Are Black Holes Cold? - Ask an Astrophysicist

Dec 14, 2007 · Replies 9 · Dec 27, 2007

Replies: 9

Views: 7K

Virtual particles and black holes

Dec 7, 2007 · Replies 10 · Dec 27, 2007

Replies: 10

Views: 5K

Kepler's Equation to calculate transfer time

Dec 24, 2007 · Replies 2 · Dec 26, 2007

Replies: 2

Views: 7K

What Would a Nebula Look Like Close Up?

Dec 26, 2007 · Replies 4 · Dec 26, 2007

Replies: 4

Views: 4K

Centre of Mass and Cosmic Expansion in 4D Universe

Dec 21, 2007 · Replies 9 · Dec 25, 2007

Replies: 9

Views: 4K

That asteroid where's it going?

Jan 16, 2007 · Replies 12 · Dec 24, 2007

Replies: 12

Views: 6K

How do we know the size of these suns?

Dec 22, 2007 · Replies 5 · Dec 23, 2007

Replies: 5

Views: 6K

If i had a black hole of 20 solar masses, how much energy would it radiate?

Dec 21, 2007 · Replies 3 · Dec 22, 2007

Replies: 3

Views: 5K

Milky Way's Two Halos Spin in Opposite Directions

Dec 17, 2007 · Replies 9 · Dec 22, 2007

Replies: 9

Views: 4K

How can you find out the amount of hawking radiation a black hole exhibits?

Dec 21, 2007 · Replies 4 · Dec 22, 2007

Replies: 4

Views: 4K

Photon radiation, how does it work?

Dec 21, 2007 · Replies 9 · Dec 22, 2007

Replies: 9

Views: 5K

Stargazing Telescope and astronomy questions

Dec 21, 2007 · Replies 5 · Dec 21, 2007

Replies: 5

Views: 4K

How is Stefan's Constant Used in Understanding Black Hole Radiation?

Dec 21, 2007 · Replies 1 · Dec 21, 2007

Replies: 1

Views: 12K

Why Did Only Saturn Develop Magnificent Rings in Our Solar System?

Dec 21, 2007 · Replies 5 · Dec 21, 2007

Replies: 5

Views: 7K

When a star explodes, does the shock wave

Dec 21, 2007 · Replies 10 · Dec 21, 2007

Replies: 10

Views: 4K

Electric Currents in Planetary Magnetic Fields

Dec 19, 2007 · Replies 4 · Dec 20, 2007

Replies: 4

Views: 3K

How to calculate the momentum of Pluto?

Dec 18, 2007 · Replies 6 · Dec 19, 2007

Replies: 6

Views: 3K

Stargazing Negative Refractive Index Telescopes?

Dec 19, 2007 · Replies 1 · Dec 19, 2007

Replies: 1

Views: 3K

Gravitational Tendency of Disks & Spheres

Dec 18, 2007 · Replies 3 · Dec 18, 2007

Replies: 3

Views: 3K

Temperature of a molecule in a galaxy

Nov 24, 2007 · Replies 10 · Dec 18, 2007

Replies: 10

Views: 3K

If gravitons exist, does that mean spacetime is not curved by mass?

Dec 13, 2007 · Replies 15 · Dec 18, 2007

Replies: 15

Views: 10K

Gregorian calendar off by 26 seconds a year

Dec 17, 2007 · Replies 3 · Dec 18, 2007

Replies: 3

Views: 9K

How Did Cosmic Inflation Shape the 14 Billion Year Journey of the Universe?

Dec 18, 2007 · Replies 1 · Dec 18, 2007

Replies: 1

Views: 5K

GRBs & Supernova: What's the Connection?

Dec 17, 2007 · Replies 5 · Dec 17, 2007

Replies: 5

Views: 3K

Saturn Rings: Age and Permanent Feature

Dec 17, 2007 · Replies 3 · Dec 17, 2007

Replies: 3

Views: 3K

Math and Distance: How Far is Pluto from Earth?

Dec 16, 2007 · Replies 4 · Dec 16, 2007

Replies: 4

Views: 3K

Is Nothingness the Cause of the Big Bang?

Dec 15, 2007 · Replies 3 · Dec 16, 2007

Replies: 3

Views: 6K

Why Does the Tully-Fisher Relation Change with Different Wavelengths?

Dec 10, 2007 · Replies 1 · Dec 15, 2007

Replies: 1

Views: 3K

How Can We Study Exoplanets Using the Doppler Effect?

Dec 15, 2007 · Replies 3 · Dec 15, 2007

Replies: 3

Views: 4K

What Is Tidal Locking and Could It Affect Earth's Axis?

Dec 12, 2007 · Replies 9 · Dec 15, 2007

Replies: 9

Views: 3K

Mass-to-light-ratio and dark matter in galaxy

Dec 12, 2007 · Replies 5 · Dec 14, 2007

Replies: 5

Views: 15K

Can Saturn Keep Its Ring System If It Moves Close to the Sun?

Dec 13, 2007 · Replies 6 · Dec 13, 2007

Replies: 6

Views: 4K

Can someone tell me if GP-B has results about GR, one way or the other?

Dec 11, 2007 · Replies 5 · Dec 13, 2007

Replies: 5

Views: 3K

Question about curvature of space

Dec 11, 2007 · Replies 8 · Dec 12, 2007

Replies: 8

Views: 3K

Can a star drift through intergalactic space?

Dec 11, 2007 · Replies 2 · Dec 11, 2007

Replies: 2

Views: 7K

Interview Someone on Black Holes

Dec 11, 2007 · Replies 1 · Dec 11, 2007

Replies: 1

Views: 2K

Does a Galactic Barrier Exist? Ask Here

Feb 14, 2007 · Replies 22 · Dec 11, 2007

Replies: 22

Views: 11K

Stargazing How to make a telescope using simple steps?

Dec 10, 2007 · Replies 1 · Dec 11, 2007

Replies: 1

Views: 4K

Distance from low earth orbit to Europa?

Dec 10, 2007 · Replies 1 · Dec 10, 2007

Replies: 1

Views: 8K

Might A Hot Jupiter Require Another Gas Giant - 3-body Problem?

Oct 11, 2007 · Replies 4 · Dec 10, 2007

Replies: 4

Views: 4K

Do Civilizations Exist Beyond the 20,000 Light-Year Sphere?

Dec 9, 2007 · Replies 1 · Dec 10, 2007

Replies: 1

Views: 2K

Exoplanet Hunting & Quantification: Tips & Resources

Dec 9, 2007 · Replies 1 · Dec 9, 2007

Replies: 1

Views: 4K

Do the planets revolve on a 2d plane?

Dec 8, 2007 · Replies 5 · Dec 9, 2007

Replies: 5

Views: 6K

Are There Any Cosmology Documentaries for Adults?

Dec 7, 2007 · Replies 2 · Dec 9, 2007

Replies: 2

Views: 11K

Stargazing Why isn't the magnification of a telescope (-)

Dec 7, 2007 · Replies 1 · Dec 8, 2007

Replies: 1

Views: 4K

Orbital Speed calculation using conservation of Energy

Dec 6, 2007 · Replies 15 · Dec 8, 2007

Replies: 15

Views: 8K

Is High Speed Space Travel Feasible with the Risk of Space Debris?

Dec 5, 2007 · Replies 15 · Dec 7, 2007

Replies: 15

Views: 6K

Understanding the acceleration of solar wind particles

Dec 4, 2007 · Replies 12 · Dec 7, 2007

Replies: 12

Views: 6K

Where to Find Information on Algol's Brightness Variation?

Dec 6, 2007 · Replies 1 · Dec 7, 2007

Replies: 1

Views: 2K

How to Set Up an Online Observatory?

Dec 6, 2007 · Replies 1 · Dec 6, 2007

Replies: 1

Views: 3K

Answer "Can a Human Become a Black Hole? Theoretically Explored

Dec 6, 2007 · Replies 1 · Dec 6, 2007

Replies: 1

Views: 2K

What is space, vaccuum, or nonexistence?

Oct 11, 2007 · Replies 79 · Dec 4, 2007

3

Replies: 79

Views: 12K

Cooperstock and Tieu Respond to Criticisms

Dec 8, 2005 · Replies 7 · Dec 4, 2007

Replies: 7

Views: 6K

Sunrise on Uranus: How Often at S. Pole?

Nov 20, 2007 · Replies 19 · Dec 3, 2007

Replies: 19

Views: 11K

My blackhole theory-Why is it Wrong?

Dec 3, 2007 · Replies 3 · Dec 3, 2007

Replies: 3

Views: 3K

How Do You Calculate Using the MOND Formula?

Aug 11, 2006 · Replies 5 · Dec 3, 2007

Replies: 5

Views: 4K

Solving for Speed of Light Inside a Black Hole

Oct 25, 2007 · Replies 19 · Dec 3, 2007

Replies: 19

Views: 5K

A question about the Satturn rings.

Dec 2, 2007 · Replies 4 · Dec 3, 2007

Replies: 4

Views: 4K

High school sophomore interested in Astrophysics

Nov 18, 2007 · Replies 11 · Dec 3, 2007

Replies: 11

Views: 5K

What is the R3 Point in the Earth-Sun Lagrangian System?

Dec 2, 2007 · Replies 3 · Dec 2, 2007

Replies: 3

Views: 3K

Looking for a mainstream explanation for gamma gays and nuetron capture signatures.

Nov 28, 2007 · Replies 6 · Dec 1, 2007

Replies: 6

Views: 4K

Detecting Black Hole accretion disc

Nov 28, 2007 · Replies 2 · Nov 30, 2007

Replies: 2

Views: 4K

Is Super Mario Galaxy Physics Possible in Real Life?

Nov 28, 2007 · Replies 4 · Nov 30, 2007

Replies: 4

Views: 5K

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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