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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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Cause of Gravity: How Does It Work?

Dec 29, 2004 · Replies 8 · Dec 30, 2004

Replies: 8

Views: 9K

A Surprising Revelation: The Truth About Asteroids and Earth

Dec 29, 2004 · Replies 1 · Dec 30, 2004

Replies: 1

Views: 2K

Unexplained preference for infinite space.

Dec 20, 2004 · Replies 5 · Dec 29, 2004

Replies: 5

Views: 3K

What Will Huygens Discover About Titan's Mysterious Atmosphere?

Dec 26, 2004 · Replies 4 · Dec 28, 2004

Replies: 4

Views: 3K

Stargazing Is it Possible for All Planets to Line Up?

Dec 27, 2004 · Replies 5 · Dec 28, 2004

Replies: 5

Views: 7K

Are Flaws in IMAP Data Affecting Our Understanding of Dark Matter?

Dec 25, 2004 · Replies 2 · Dec 28, 2004

Replies: 2

Views: 3K

Why Does Venus Rotate Differently?

Dec 26, 2004 · Replies 5 · Dec 27, 2004

Replies: 5

Views: 3K

Can we be tricked into thinking W=-1

Dec 23, 2004 · Replies 1 · Dec 25, 2004

Replies: 1

Views: 2K

What is the concept of concentrated mass?

Dec 15, 2004 · Replies 4 · Dec 24, 2004

Replies: 4

Views: 16K

Consensus: Streak in Image an Insect

Dec 21, 2004 · Replies 2 · Dec 24, 2004

Replies: 2

Views: 2K

Do Planets Generate Their Own Light?

Dec 23, 2004 · Replies 9 · Dec 24, 2004

Replies: 9

Views: 4K

Idea find black holes using grav. lensing

Dec 22, 2004 · Replies 4 · Dec 23, 2004

Replies: 4

Views: 2K

Gas Giant Ring Collapse Theory for Rocky Planet Formation

Dec 22, 2004 · Replies 1 · Dec 22, 2004

Replies: 1

Views: 3K

Possible Meteor Explosion Near Jakarta Causes Loud Noise, No Injuries Reported

Dec 21, 2004 · Replies 1 · Dec 21, 2004

Replies: 1

Views: 3K

Sun's Absolute Velocity: Molecular Measurements & Vacuum Experiments

Dec 21, 2004 · Replies 3 · Dec 21, 2004

Replies: 3

Views: 2K

Astronomers observe some galaxy

Dec 17, 2004 · Replies 6 · Dec 21, 2004

Replies: 6

Views: 2K

10^6 X stronger than Earth¹s lightning: Some of Cassini's findings discussed

Dec 20, 2004 · Replies 1 · Dec 21, 2004

Replies: 1

Views: 3K

NOVA special on String/cosmology

Dec 19, 2004 · Replies 1 · Dec 20, 2004

Replies: 1

Views: 2K

What is the Role of Subspace in Sci-Fi Universes?

Dec 19, 2004 · Replies 4 · Dec 19, 2004

Replies: 4

Views: 14K

Earth's Abrupt Edge: 4B Year Old Star Encounter Revealed

Dec 19, 2004 · Replies 1 · Dec 19, 2004

Replies: 1

Views: 3K

What is the motion of a singularity

Dec 18, 2004 · Replies 6 · Dec 19, 2004

Replies: 6

Views: 2K

What is zeeman and stark effects?

Dec 16, 2004 · Replies 2 · Dec 18, 2004

Replies: 2

Views: 5K

Can Black Holes Compute Universes?

Dec 18, 2004 · Replies 1 · Dec 18, 2004

Replies: 1

Views: 2K

Cosmic Background Radiation & Big Bang

Dec 16, 2004 · Replies 15 · Dec 18, 2004

Replies: 15

Views: 6K

Did You Spot Any Meteors Tonight?

Dec 13, 2004 · Replies 7 · Dec 18, 2004

Replies: 7

Views: 3K

Advanced Civilizations Could Make SETI Signal Detection Impossible

Dec 11, 2004 · Replies 17 · Dec 17, 2004

Replies: 17

Views: 4K

Little Black Holes: Dark Matter And Ball Lightning

Dec 16, 2004 · Replies 1 · Dec 17, 2004

Replies: 1

Views: 7K

Is our galaxy in the centre of the universe?

Dec 17, 2004 · Replies 4 · Dec 17, 2004

Replies: 4

Views: 7K

Stargazing Giant Magellan Telescope GMT Announcement

Dec 16, 2004 · Replies 4 · Dec 17, 2004

Replies: 4

Views: 3K

Mass of Jupiter using as Many moons as Possible

Oct 31, 2004 · Replies 2 · Dec 17, 2004

Replies: 2

Views: 5K

The Mystery of H- & HII Ions: Why the Balance Matters

Dec 14, 2004 · Replies 2 · Dec 16, 2004

Replies: 2

Views: 3K

Dark Matter Detection: Controversy Grows

Dec 14, 2004 · Replies 1 · Dec 16, 2004

Replies: 1

Views: 2K

Could Binary Planetary Systems Exist with Earth-Sized Bodies?

Dec 10, 2004 · Replies 22 · Dec 16, 2004

Replies: 22

Views: 9K

Is New Galaxy Formation Possible at the Edge of the Expanding Universe?

Nov 22, 2004 · Replies 26 · Dec 15, 2004

Replies: 26

Views: 4K

Virtual Pairs and the Fate of the Universe

Dec 14, 2004 · Replies 4 · Dec 15, 2004

Replies: 4

Views: 3K

Does Dark Matter's Interaction with Gravity Prevent it from Forming Black Holes?

Dec 13, 2004 · Replies 7 · Dec 14, 2004

Replies: 7

Views: 3K

What Are the Codes for Stellar Astrophysics?

Dec 11, 2004 · Replies 4 · Dec 14, 2004

Replies: 4

Views: 3K

WMAP 2-Year Data: Findings, Delays & Follow-Ups

Dec 11, 2004 · Replies 10 · Dec 14, 2004

Replies: 10

Views: 3K

Why does the earth rotate around its

Dec 10, 2004 · Replies 3 · Dec 14, 2004

Replies: 3

Views: 3K

New comet has brightened to naked-eye visibility

Dec 7, 2004 · Replies 5 · Dec 13, 2004

Replies: 5

Views: 3K

How are the galactic jets made in black holes?

Dec 10, 2004 · Replies 11 · Dec 13, 2004

Replies: 11

Views: 4K

Investigating the Effect of the Sun on Tides

Dec 13, 2004 · Replies 3 · Dec 13, 2004

Replies: 3

Views: 3K

Does the gravity constant change?

Dec 5, 2004 · Replies 3 · Dec 13, 2004

Replies: 3

Views: 6K

Could hot dark matter be cold dark matter?

Dec 11, 2004 · Replies 4 · Dec 13, 2004

Replies: 4

Views: 4K

Is Dark Matter Really Necessary for Explaining Galaxy Rotation Curves?

Dec 9, 2004 · Replies 6 · Dec 13, 2004

Replies: 6

Views: 3K

Why Are White Dwarfs Hot Despite Their High Density?

Dec 12, 2004 · Replies 2 · Dec 12, 2004

Replies: 2

Views: 6K

What is the relationship between luminosity and magnitude in stars?

Dec 8, 2004 · Replies 2 · Dec 12, 2004

Replies: 2

Views: 2K

Stargazing Telescope or Binoculars: Which Makes a Better Gift?

Dec 11, 2004 · Replies 10 · Dec 12, 2004

Replies: 10

Views: 5K

ZPE energy levels and cosmology.

Dec 11, 2004 · Replies 6 · Dec 11, 2004

Replies: 6

Views: 3K

Can anyone tell me which content of astronomy's book or magzine is the best?

Dec 11, 2004 · Replies 1 · Dec 11, 2004

Replies: 1

Views: 2K

Titanic merger of galaxy clusters revealed

Sep 24, 2004 · Replies 18 · Dec 11, 2004

Replies: 18

Views: 4K

Include Sun's Diameter in Star Distance Measurement?

Dec 10, 2004 · Replies 2 · Dec 11, 2004

Replies: 2

Views: 2K

Can White Holes and Hawking Radiation Explain the Big Bang?

Nov 20, 2004 · Replies 28 · Dec 11, 2004

Replies: 28

Views: 6K

How to estimate star's mass without gravitation constant?

Dec 10, 2004 · Replies 3 · Dec 10, 2004

Replies: 3

Views: 4K

Could Mars Bring Deadly Bugs to Earth?

Dec 10, 2004 · Replies 2 · Dec 10, 2004

Replies: 2

Views: 3K

Does Phase Space Explain Entropy?

Dec 9, 2004 · Replies 5 · Dec 10, 2004

Replies: 5

Views: 3K

Is Water Essential for Extraterrestrial Life?

Dec 7, 2004 · Replies 11 · Dec 10, 2004

Replies: 11

Views: 4K

Space Expansion from Dark Matter

Nov 30, 2004 · Replies 17 · Dec 9, 2004

Replies: 17

Views: 4K

A question in Kepler's second and third laws.

Dec 7, 2004 · Replies 11 · Dec 8, 2004

Replies: 11

Views: 14K

Incredible Impact Photo: First Ever Recorded Image

Dec 7, 2004 · Replies 6 · Dec 8, 2004

Replies: 6

Views: 3K

Are Black Holes Truly Infinite in Mass and Energy?

Nov 30, 2004 · Replies 3 · Dec 8, 2004

Replies: 3

Views: 2K

Why Do Stars Turn Red Giants as They Age?

Dec 8, 2004 · Replies 3 · Dec 8, 2004

Replies: 3

Views: 9K

Doppler Effect and Harmful Radiation

Dec 8, 2004 · Replies 2 · Dec 8, 2004

Replies: 2

Views: 2K

Detecting a Gravity Wave: What Kind of Event Could Produce It?

Nov 27, 2004 · Replies 13 · Dec 8, 2004

Replies: 13

Views: 4K

What Makes This Gamma-Ray Burst Even Brighter Than Others?

Dec 6, 2004 · Replies 3 · Dec 7, 2004

Replies: 3

Views: 3K

Stargazing Solar eclipses, total and annular

Dec 5, 2004 · Replies 6 · Dec 7, 2004

Replies: 6

Views: 1K

How Can Gravity Escape a Black Hole While Light Cannot?

Nov 30, 2004 · Replies 12 · Dec 7, 2004

Replies: 12

Views: 3K

Why does a bight object like the sun have negative magnitude?

Dec 6, 2004 · Replies 4 · Dec 7, 2004

Replies: 4

Views: 3K

What Occurs First: Nuclear Fusion or Fission in a Star?

Dec 4, 2004 · Replies 10 · Dec 6, 2004

Replies: 10

Views: 5K

Sending space probes to other planets

Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

Views: 5K

How Many Orbits Does a Solar Sail Need to Reach the Moon?

Nov 23, 2004 · Replies 9 · Dec 6, 2004

Replies: 9

Views: 8K

Congrats to All Gurus - PF Forum Appreciation

Dec 6, 2004 · Replies 2 · Dec 6, 2004

Replies: 2

Views: 2K

Why can you see white through H-alpha filter?

Nov 28, 2004 · Replies 9 · Dec 5, 2004

Replies: 9

Views: 4K

Is Saturn's Surface as Beautiful as it Looks in the Latest Cassini Image?

Nov 29, 2004 · Replies 10 · Dec 5, 2004

Replies: 10

Views: 4K

What are the 42 proposed mechanisms for baryogenesis according to this paper?

Nov 22, 2004 · Replies 11 · Dec 5, 2004

Replies: 11

Views: 4K

What Type of Finite or Infinite Universe?

Nov 24, 2004 · Replies 5 · Dec 5, 2004

Replies: 5

Views: 4K

Can Aliens Decode Our Messages? M13 Mystery Unveiled!

Dec 4, 2004 · Replies 1 · Dec 4, 2004

Replies: 1

Views: 3K

Understanding the Cosmic Quadrupole and Its Impact on CMBR Photons

Dec 1, 2004 · Replies 12 · Dec 4, 2004

Replies: 12

Views: 3K

What Would Happen If the Moon Entered Earth's Atmosphere?

Dec 4, 2004 · Replies 2 · Dec 4, 2004

Replies: 2

Views: 11K

Relativity & Quantum Field Theory: Explaining Cosmological Constant

Nov 30, 2004 · Replies 11 · Dec 4, 2004

Replies: 11

Views: 5K

Will the Universe Have a New Beginning?

Dec 3, 2004 · Replies 1 · Dec 3, 2004

Replies: 1

Views: 2K

Inverse Square Law - Is It Valid for Quasars?

Nov 30, 2004 · Replies 8 · Dec 3, 2004

Replies: 8

Views: 4K

How do nebulas form stars and solar systems?

Nov 28, 2004 · Replies 9 · Dec 3, 2004

Replies: 9

Views: 4K

Poll

Pluto's Planet Status: The Truth About the Ninth Planet of Our Solar System

Nov 28, 2004 · Replies 8 · Dec 2, 2004

Replies: 8

Views: 3K

Kepler's Laws and altitude of orbit

Sep 22, 2004 · Replies 28 · Dec 2, 2004

Replies: 28

Views: 22K

How many papers on arXiv get published

Dec 1, 2004 · Replies 1 · Dec 2, 2004

Replies: 1

Views: 3K

What Are the Margins of Error in Calculating the Cosmologic Constant?

Dec 2, 2004 · Replies 1 · Dec 2, 2004

Replies: 1

Views: 3K

Relative Gravity: How Size Affects Force of Gravity

Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

Views: 8K

Formation of Black Holes from Neutron Stars and White Dwarfs

May 29, 2004 · Replies 46 · Dec 1, 2004

2

Replies: 46

Views: 18K

Stargazing New Scientist Article - Pendulums + Solar Eclipse

Nov 29, 2004 · Replies 7 · Dec 1, 2004

Replies: 7

Views: 3K

Why Do We Seek a Universe Born from 'Almost Nothing'?

Nov 25, 2004 · Replies 43 · Nov 30, 2004

2

Replies: 43

Views: 6K

Unraveling the Mystery of Hyperbolic Trajectories

Nov 23, 2004 · Replies 4 · Nov 30, 2004

Replies: 4

Views: 2K

Hubble's law- little bit of help

Oct 29, 2004 · Replies 7 · Nov 30, 2004

Replies: 7

Views: 4K

Stargazing Saturn using ETX-105 and a QuickCam 4000

Nov 26, 2004 · Replies 4 · Nov 29, 2004

Replies: 4

Views: 1K

If Sun = 98% H & He, why continuous spectrum?

Nov 28, 2004 · Replies 16 · Nov 29, 2004

Replies: 16

Views: 19K

Look at the Perfectly Circular Moon Shining Through the Clouds!

Nov 23, 2004 · Replies 8 · Nov 26, 2004

Replies: 8

Views: 3K

Can Distant Stars Fill the Universe with Photons?

Nov 24, 2004 · Replies 10 · Nov 25, 2004

Replies: 10

Views: 4K

How Can I Effectively Investigate Meteor Impact Crater Formation?

Oct 21, 2004 · Replies 8 · Nov 24, 2004

Replies: 8

Views: 4K

Are Manned Missions Still Necessary for Space Exploration?

Nov 23, 2004 · Replies 2 · Nov 24, 2004

Replies: 2

Views: 3K

What is the true color of the sun and how are we able to capture it in images?

Nov 21, 2004 · Replies 6 · Nov 24, 2004

Replies: 6

Views: 3K

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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