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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 What is the motion of a singularity

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

Replies: 6

Views: 2K

High School What is zeeman and stark effects?

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

Replies: 2

Views: 5K

Graduate Can Black Holes Compute Universes?

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

Replies: 1

Views: 2K

Graduate 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

Graduate Advanced Civilizations Could Make SETI Signal Detection Impossible

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

Replies: 17

Views: 4K

Graduate Little Black Holes: Dark Matter And Ball Lightning

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

Replies: 1

Views: 7K

Graduate 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

Graduate Mass of Jupiter using as Many moons as Possible

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

Replies: 2

Views: 5K

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

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

Replies: 2

Views: 3K

Graduate Dark Matter Detection: Controversy Grows

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

Replies: 1

Views: 2K

Graduate Could Binary Planetary Systems Exist with Earth-Sized Bodies?

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

Replies: 22

Views: 9K

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

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

Replies: 26

Views: 4K

Graduate Virtual Pairs and the Fate of the Universe

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

Replies: 4

Views: 3K

Graduate 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

Graduate What Are the Codes for Stellar Astrophysics?

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

Replies: 4

Views: 3K

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

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

Replies: 10

Views: 3K

High School 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

Graduate How are the galactic jets made in black holes?

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

Replies: 11

Views: 4K

High School Investigating the Effect of the Sun on Tides

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

Replies: 3

Views: 3K

Graduate Does the gravity constant change?

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

Replies: 3

Views: 6K

Graduate Could hot dark matter be cold dark matter?

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

Replies: 4

Views: 4K

Graduate Is Dark Matter Really Necessary for Explaining Galaxy Rotation Curves?

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

Replies: 6

Views: 3K

Graduate Why Are White Dwarfs Hot Despite Their High Density?

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

Replies: 2

Views: 6K

Undergrad 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

Graduate 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

Graduate Titanic merger of galaxy clusters revealed

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

Replies: 18

Views: 4K

Undergrad Include Sun's Diameter in Star Distance Measurement?

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

Replies: 2

Views: 2K

Graduate 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

Undergrad Could Mars Bring Deadly Bugs to Earth?

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

Replies: 2

Views: 3K

Graduate Does Phase Space Explain Entropy?

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

Replies: 5

Views: 3K

High School Is Water Essential for Extraterrestrial Life?

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

Replies: 11

Views: 4K

Graduate Space Expansion from Dark Matter

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

Replies: 17

Views: 4K

Graduate 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

Undergrad Are Black Holes Truly Infinite in Mass and Energy?

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

Replies: 3

Views: 3K

Undergrad Why Do Stars Turn Red Giants as They Age?

Dec 8, 2004 · Replies 3 · Dec 8, 2004

Replies: 3

Views: 9K

Graduate Doppler Effect and Harmful Radiation

Dec 8, 2004 · Replies 2 · Dec 8, 2004

Replies: 2

Views: 3K

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

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

Replies: 13

Views: 4K

Graduate 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

Graduate How Can Gravity Escape a Black Hole While Light Cannot?

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

Replies: 12

Views: 3K

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

Dec 6, 2004 · Replies 4 · Dec 7, 2004

Replies: 4

Views: 3K

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

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

Replies: 10

Views: 5K

Undergrad Sending space probes to other planets

Dec 5, 2004 · Replies 5 · Dec 6, 2004

Replies: 5

Views: 5K

Graduate 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

Undergrad 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

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

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

Replies: 11

Views: 4K

Graduate What Type of Finite or Infinite Universe?

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

Replies: 5

Views: 4K

High School Can Aliens Decode Our Messages? M13 Mystery Unveiled!

Dec 4, 2004 · Replies 1 · Dec 4, 2004

Replies: 1

Views: 4K

Graduate Understanding the Cosmic Quadrupole and Its Impact on CMBR Photons

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

Replies: 12

Views: 3K

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

Dec 4, 2004 · Replies 2 · Dec 4, 2004

Replies: 2

Views: 11K

Graduate Relativity & Quantum Field Theory: Explaining Cosmological Constant

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

Replies: 11

Views: 5K

Graduate Will the Universe Have a New Beginning?

Dec 3, 2004 · Replies 1 · Dec 3, 2004

Replies: 1

Views: 3K

Undergrad Inverse Square Law - Is It Valid for Quasars?

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

Replies: 8

Views: 4K

High School How do nebulas form stars and solar systems?

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

Replies: 9

Views: 4K

Poll

High School 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

Undergrad 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

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

Dec 2, 2004 · Replies 1 · Dec 2, 2004

Replies: 1

Views: 3K

High School Relative Gravity: How Size Affects Force of Gravity

Dec 1, 2004 · Replies 3 · Dec 1, 2004

Replies: 3

Views: 8K

Undergrad 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

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

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

2

Replies: 43

Views: 6K

Graduate Unraveling the Mystery of Hyperbolic Trajectories

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

Replies: 4

Views: 2K

Undergrad Hubble's law- little bit of help

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

Replies: 7

Views: 5K

Stargazing Saturn using ETX-105 and a QuickCam 4000

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

Replies: 4

Views: 1K

Undergrad 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

Undergrad Can Distant Stars Fill the Universe with Photons?

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

Replies: 10

Views: 4K

Undergrad 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

High School 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

High School Asteroid Math: Get Help with Large Math Project

Nov 19, 2004 · Replies 4 · Nov 24, 2004

Replies: 4

Views: 7K

Graduate Latest Astronomy/Cosmology Research & Proposals

Nov 6, 2004 · Replies 16 · Nov 24, 2004

Replies: 16

Views: 5K

Graduate What is the Maximum Radial Velocity in a Simple Hyperbolic Orbit?

Nov 19, 2004 · Replies 20 · Nov 23, 2004

Replies: 20

Views: 14K

Graduate Universe be described with mass imbedded in space-time?

Oct 28, 2004 · Replies 5 · Nov 23, 2004

Replies: 5

Views: 9K

High School Deja vu is a ripple in space-time

Oct 26, 2004 · Replies 5 · Nov 23, 2004

Replies: 5

Views: 4K

Graduate Supernovae GRB Research: Insight for Fans

Oct 24, 2004 · Replies 25 · Nov 23, 2004

Replies: 25

Views: 5K

Graduate What is the role of life in the universe?

Nov 14, 2004 · Replies 62 · Nov 23, 2004

3

Replies: 62

Views: 16K

Undergrad Best way to get 'learn' Astrophysics

Nov 23, 2004 · Replies 1 · Nov 23, 2004

Replies: 1

Views: 7K

Graduate Scale factor in Robertson-Walker metric

Nov 18, 2004 · Replies 19 · Nov 23, 2004

Replies: 19

Views: 11K

Graduate The Discovery of a Z=10 Galaxy: Implications for the Early Universe

Apr 9, 2004 · Replies 17 · Nov 23, 2004

Replies: 17

Views: 4K

Undergrad Star Cluster Gravity: Impact on Forces

Nov 21, 2004 · Replies 4 · Nov 22, 2004

Replies: 4

Views: 4K

Graduate Do Black Holes Really Emit Radiation?

Nov 13, 2004 · Replies 6 · Nov 22, 2004

Replies: 6

Views: 4K

Graduate What Existed Before the Big Bang?

Nov 5, 2004 · Replies 40 · Nov 22, 2004

2

Replies: 40

Views: 7K

Stargazing What is the Soligor 8in telescope like?

Nov 20, 2004 · Replies 1 · Nov 21, 2004

Replies: 1

Views: 3K

Graduate Curvature of Space - Is it Still Relevant in Modern Physics?

Nov 17, 2004 · Replies 7 · Nov 21, 2004

Replies: 7

Views: 3K

High School Make Sense of our Solar System's Place in the Universe

Nov 20, 2004 · Replies 2 · Nov 21, 2004

Replies: 2

Views: 10K

Graduate Understanding the Effects of Black Holes on Mass and Gravity

Nov 20, 2004 · Replies 5 · Nov 21, 2004

Replies: 5

Views: 2K

Graduate What Is the Universe Expanding Into?

Nov 14, 2004 · Replies 5 · Nov 20, 2004

Replies: 5

Views: 5K

Graduate What shall we call this class of star?

Oct 6, 2004 · Replies 8 · Nov 19, 2004

Replies: 8

Views: 3K

Graduate Losing mass, gravity, curved space, and more

Nov 18, 2004 · Replies 8 · Nov 19, 2004

Replies: 8

Views: 4K

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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