Menu

Navigation

More options

Style variation

Contact us

Astronomy, Astrophysics, Cosmology Forum

Join in expert discussion on the topics of Astronomy, astrophysics and cosmology. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.

Filters

High School The Colors of Stars: Why Are Some Red and Others White or Blue?

Aug 13, 2004 · Replies 4 · Aug 13, 2004

Replies: 4

Views: 3K

Graduate Is Space Merely a Manifestation of Matter and Energy?

Aug 3, 2004 · Replies 40 · Aug 13, 2004

2

Replies: 40

Views: 5K

Why the universe want to know itself?

Aug 7, 2004 · Replies 15 · Aug 13, 2004

Replies: 15

Views: 5K

Graduate Dear Nereid and Phobos (seat belt on) can we talk about redshifts?

Aug 12, 2004 · Replies 4 · Aug 13, 2004

Replies: 4

Views: 2K

Graduate Furthest Point on Earth from the Center: Mt Chimburazo, Ecuador

Jul 21, 2004 · Replies 8 · Aug 12, 2004

Replies: 8

Views: 13K

High School Is Research on Gravity Lifts a Step Towards Defying Gravity?

Aug 10, 2004 · Replies 6 · Aug 12, 2004

Replies: 6

Views: 5K

Undergrad How do we detect x-rays from the center of our galaxy?

Aug 2, 2004 · Replies 14 · Aug 11, 2004

Replies: 14

Views: 5K

Graduate Expanding Universe - weakening gravity?

Aug 10, 2004 · Replies 7 · Aug 11, 2004

Replies: 7

Views: 6K

High School Hubble hit by instrument failure

Aug 8, 2004 · Replies 8 · Aug 11, 2004

Replies: 8

Views: 3K

Graduate Dark Matter & Gravitational Effects on Galaxies

Aug 2, 2004 · Replies 4 · Aug 11, 2004

Replies: 4

Views: 3K

Undergrad Is Isaac Asimov's Moon-Planet Theory Valid?

Sep 30, 2003 · Replies 8 · Aug 11, 2004

Replies: 8

Views: 11K

Undergrad Is Bush's Vision for Space Exploration Grounded by Budget Cuts?

Jul 25, 2004 · Replies 16 · Aug 11, 2004

Replies: 16

Views: 4K

Graduate Stretched space far from our own

Jul 27, 2004 · Replies 49 · Aug 9, 2004

2

Replies: 49

Views: 7K

High School Why Are We Orbiting Earth Instead of Landing on the Moon Again?

Jun 22, 2004 · Replies 176 · Aug 9, 2004

6

Replies: 176

Views: 28K

Graduate How was time and space created at the Big Bang?

Jul 25, 2004 · Replies 20 · Aug 8, 2004

Replies: 20

Views: 5K

Graduate Final project - fate of the universe - need ideas

Aug 1, 2004 · Replies 4 · Aug 8, 2004

Replies: 4

Views: 4K

Graduate What caused the planets to aggregate as they did?

Jul 24, 2004 · Replies 16 · Aug 6, 2004

Replies: 16

Views: 5K

Graduate Why the Moon Looks Big at the Horizon and Smaller When Higher Up.

Aug 6, 2004 · Replies 2 · Aug 6, 2004

Replies: 2

Views: 6K

Graduate Calculating viewing times of satellite from groundstation

Aug 4, 2004 · Replies 16 · Aug 6, 2004

Replies: 16

Views: 8K

Undergrad Black holes do not collapse to singularity>

Jul 16, 2004 · Replies 18 · Aug 6, 2004

Replies: 18

Views: 6K

Have you witnessed a dazzling Iridium flare in the night sky?

Jul 22, 2004 · Replies 32 · Aug 5, 2004

2

Replies: 32

Views: 8K

Stargazing Best telescope for a young astronomer under $750?

Jun 30, 2004 · Replies 9 · Aug 5, 2004

Replies: 9

Views: 4K

Graduate Gamma Ray Bursters: Cause of Short-Lived Flashes of Light

Aug 2, 2004 · Replies 16 · Aug 4, 2004

Replies: 16

Views: 3K

Graduate The Hawking Effect: Unruh-Schutzhold Paper

Aug 4, 2004 · Replies 1 · Aug 4, 2004

Replies: 1

Views: 4K

Graduate Could Superluminal Light Speeds Impact Theories on the Universe's Cold Death?

Aug 3, 2004 · Replies 2 · Aug 4, 2004

Replies: 2

Views: 3K

Graduate Could Our Universe Have Originated from Another Universe's Black Hole?

Aug 1, 2004 · Replies 19 · Aug 3, 2004

Replies: 19

Views: 5K

Undergrad Favoured theory for planetary formation

Aug 2, 2004 · Replies 7 · Aug 3, 2004

Replies: 7

Views: 3K

Graduate Why Do Some Stars Explode?

Aug 2, 2004 · Replies 8 · Aug 3, 2004

Replies: 8

Views: 13K

Graduate What was the Maximum Energy Density at the Onset of the Big Bang Expansion?

Jul 31, 2004 · Replies 24 · Aug 3, 2004

Replies: 24

Views: 8K

Graduate Supernova Ignition: Does Blackhole Mass Influence Star Formation?

Jun 10, 2004 · Replies 5 · Aug 3, 2004

Replies: 5

Views: 4K

Graduate Explaining B-Field of N-Star: How Neutron Stars Have Magnetic Fields

Jul 28, 2004 · Replies 2 · Aug 2, 2004

Replies: 2

Views: 4K

Graduate Vacuum energy in gravitational fields

Aug 1, 2004 · Replies 6 · Aug 2, 2004

Replies: 6

Views: 4K

Graduate What would the universe be like

Jun 29, 2004 · Replies 88 · Aug 2, 2004

3

Replies: 88

Views: 13K

Undergrad Probability of Intelligent Life in Our Galaxy

Jul 29, 2004 · Replies 51 · Aug 2, 2004

2

Replies: 51

Views: 8K

Graduate Hawking Radiation: What it is and How it Relates to the Schwarzschild Radius

Aug 1, 2004 · Replies 4 · Aug 1, 2004

Replies: 4

Views: 4K

Graduate Fine structure constant changes over time

Jul 2, 2004 · Replies 22 · Aug 1, 2004

Replies: 22

Views: 5K

Undergrad Space as a vacuum and earth's atmosphere

Jun 19, 2004 · Replies 9 · Aug 1, 2004

Replies: 9

Views: 7K

Undergrad Cosmological Red Shift: What Is It & How Does It Relate to Gravity?

Jul 31, 2004 · Replies 5 · Aug 1, 2004

Replies: 5

Views: 4K

Graduate Is a larger initial size for the universe possible?

Jul 30, 2004 · Replies 13 · Jul 31, 2004

Replies: 13

Views: 4K

Graduate The most significant, immediate relic of primordial quantum mechanics?

Jul 28, 2004 · Replies 13 · Jul 31, 2004

Replies: 13

Views: 3K

The Universe Is Alive And Thinking

Jun 29, 2004 · Replies 16 · Jul 31, 2004

Replies: 16

Views: 4K

What came first CYBERSPACE or OUTERSPACE?

Dec 16, 2003 · Replies 21 · Jul 31, 2004

Replies: 21

Views: 5K

Could Other Universes Exist Beyond Our Own?

Jul 28, 2004 · Replies 8 · Jul 30, 2004

Replies: 8

Views: 9K

Graduate Understanding Type II Supernovae: N-Star vs. BH Supernova Explained

Jul 29, 2004 · Replies 4 · Jul 30, 2004

Replies: 4

Views: 4K

Graduate Is the existence of Hawking Radiation compatible with the Big Bang theory?

Jul 23, 2004 · Replies 7 · Jul 30, 2004

Replies: 7

Views: 4K

Undergrad Explaining 4D Space-Time in Simple Terms

Jul 30, 2004 · Replies 7 · Jul 30, 2004

Replies: 7

Views: 2K

High School Determining a Planet's Age Based on Mountain Ranges

Jul 28, 2004 · Replies 2 · Jul 30, 2004

Replies: 2

Views: 6K

Undergrad Why do neutron stars have magnetic fields

Jul 26, 2004 · Replies 4 · Jul 29, 2004

Replies: 4

Views: 10K

Graduate What Is the Substance of Space and Its Role in Our Perception?

Jul 28, 2004 · Replies 5 · Jul 29, 2004

Replies: 5

Views: 3K

Undergrad What mass is lost after a hypernovae?

May 13, 2004 · Replies 10 · Jul 29, 2004

Replies: 10

Views: 4K

Graduate Dark energy + missing antimatter

Jul 23, 2004 · Replies 7 · Jul 29, 2004

Replies: 7

Views: 5K

High School Explaining Singularity: A Beginner's Guide

Jul 23, 2004 · Replies 7 · Jul 29, 2004

Replies: 7

Views: 9K

Undergrad Determining orbits from R.A., Dec, & time

Dec 2, 2003 · Replies 12 · Jul 29, 2004

Replies: 12

Views: 11K

Graduate Steven Hawking / MKaku. Who's right about Black Holes?

Jul 27, 2004 · Replies 8 · Jul 28, 2004

Replies: 8

Views: 6K

Graduate Black Holes: Comparing Hawking & Kaku Theories

Jul 27, 2004 · Replies 1 · Jul 28, 2004

Replies: 1

Views: 2K

Graduate Observational Difference Between Neutron Star & Black Hole

Jul 28, 2004 · Replies 3 · Jul 28, 2004

Replies: 3

Views: 3K

Graduate Do Black Holes Truly Have Zero-Point Volume Singularities?

Jul 19, 2004 · Replies 4 · Jul 28, 2004

Replies: 4

Views: 5K

UFO Sighting: Is It Real or Imaginary?

Jul 27, 2004 · Replies 2 · Jul 27, 2004

Replies: 2

Views: 3K

Graduate Has Stephen Hawking Solved the Black Hole Information Paradox?

Jul 20, 2004 · Replies 8 · Jul 27, 2004

Replies: 8

Views: 5K

Undergrad Black holes and dark matter holding galaxies together?

Jul 17, 2004 · Replies 9 · Jul 26, 2004

Replies: 9

Views: 6K

Graduate How Do Black Holes Create Dark Energy and Influence Universal Expansion?

Jul 24, 2004 · Replies 19 · Jul 26, 2004

Replies: 19

Views: 9K

Graduate CalTech BH answer contradicts Hawking's

Jul 25, 2004 · Replies 4 · Jul 25, 2004

Replies: 4

Views: 3K

Undergrad Are There Non-Rotating Objects in Space?

Jul 24, 2004 · Replies 2 · Jul 25, 2004

Replies: 2

Views: 3K

Discover the Ultimate Guide: Gravitation by Misner, Thorne, and Wheeler

Jul 23, 2004 · Replies 7 · Jul 25, 2004

Replies: 7

Views: 3K

Graduate Is Dark Matter Made of Ordinary Matter or Something Exotic?

Jul 14, 2004 · Replies 15 · Jul 25, 2004

Replies: 15

Views: 4K

Graduate How Much Gravity Does a Black Hole Need to Contain Light?

Jul 24, 2004 · Replies 7 · Jul 25, 2004

Replies: 7

Views: 3K

Graduate Time Travel: No spaceships, no wormholes

May 20, 2004 · Replies 27 · Jul 25, 2004

Replies: 27

Views: 6K

Graduate Which force drives the expansion of the universe?

Jun 14, 2004 · Replies 12 · Jul 24, 2004

Replies: 12

Views: 6K

Undergrad Gigantic Black Hole Collision: Andromeda & Milky Way

Jul 22, 2004 · Replies 19 · Jul 24, 2004

Replies: 19

Views: 5K

Graduate Are There Stars with Highly Eccentric Orbits Around the Center of Their Galaxy?

Jul 24, 2004 · Replies 1 · Jul 24, 2004

Replies: 1

Views: 3K

Graduate Did Hawking's Dublin Talk Redefine Quantum Gravity Observables?

Jul 21, 2004 · Replies 8 · Jul 23, 2004

Replies: 8

Views: 3K

Undergrad Cause of Billiard Ball Spin: Celestial Connection?

Jul 22, 2004 · Replies 1 · Jul 23, 2004

Replies: 1

Views: 3K

Graduate Are White Holes the Key to Understanding Black Holes and Quasars?

Jul 20, 2004 · Replies 6 · Jul 23, 2004

Replies: 6

Views: 7K

High School Planet formation DOES happen in slow motion

Jul 21, 2004 · Replies 8 · Jul 22, 2004

Replies: 8

Views: 3K

Undergrad Why Does the Moon Cause Tides despite Sun’s Greater Force?

Jul 19, 2004 · Replies 13 · Jul 22, 2004

Replies: 13

Views: 5K

Graduate Can a small black hole exist inside a larger black hole?

Jul 21, 2004 · Replies 3 · Jul 22, 2004

Replies: 3

Views: 3K

High School Odds of Earth Impact vs Winning Powerball

Jul 13, 2004 · Replies 16 · Jul 22, 2004

Replies: 16

Views: 6K

Graduate Is there a limit to the validity of laws as the universe expands?

Jul 20, 2004 · Replies 13 · Jul 22, 2004

Replies: 13

Views: 4K

Graduate Do Black Holes Generate Dark Energy?

Jul 21, 2004 · Replies 4 · Jul 22, 2004

Replies: 4

Views: 6K

Undergrad Can Objects Enter a Black Hole from an Angle?

Jul 21, 2004 · Replies 8 · Jul 22, 2004

Replies: 8

Views: 3K

Undergrad Shock Wave in Space: Vacuum or Medium?

Jul 20, 2004 · Replies 4 · Jul 22, 2004

Replies: 4

Views: 4K

Graduate Is the Sun Distorting Earth's Space-Time?

Apr 27, 2004 · Replies 30 · Jul 21, 2004

2

Replies: 30

Views: 6K

Graduate What Does XMM-Newton Reveal About Dark Energy in the X-ray Universe?

Feb 20, 2004 · Replies 167 · Jul 21, 2004

6

Replies: 167

Views: 22K

Graduate Can black holes ever truly disappear?

Jul 14, 2004 · Replies 14 · Jul 20, 2004

Replies: 14

Views: 4K

Graduate Do Black Holes Emit Higgs Particles in Hawking Radiation?

Jul 20, 2004 · Replies 1 · Jul 20, 2004

Replies: 1

Views: 3K

Graduate What Would Happen if a White Hole Collided with a Black Hole?

Jul 9, 2004 · Replies 17 · Jul 20, 2004

Replies: 17

Views: 14K

Graduate Can the Booda Cosmic Isotropy Duality Hypothesis Be Proven?

Jul 20, 2004 · Replies 2 · Jul 20, 2004

Replies: 2

Views: 3K

High School Astronomy Club: A Student's Adventure in Learning

Jul 16, 2004 · Replies 10 · Jul 20, 2004

Replies: 10

Views: 5K

Graduate Is the Universe Truly Infinite and Expanding, or Does It Have Limits?

Jul 15, 2004 · Replies 19 · Jul 19, 2004

Replies: 19

Views: 5K

Graduate The Mystery of the Universe's Origin

Jul 18, 2004 · Replies 3 · Jul 19, 2004

Replies: 3

Views: 2K

Undergrad Can Things Really Escape Black Holes?

Jul 17, 2004 · Replies 4 · Jul 18, 2004

Replies: 4

Views: 2K

Graduate Theories of The Universe (and Reality)

Jul 6, 2004 · Replies 15 · Jul 18, 2004

Replies: 15

Views: 3K

Hawking Solves Black Hole Mystery

Jul 15, 2004 · Replies 51 · Jul 18, 2004

2

Replies: 51

Views: 11K

Graduate Black hole might crunch the many planets into marble-sized spheres

Jun 28, 2004 · Replies 7 · Jul 18, 2004

Replies: 7

Views: 3K

Graduate Are We Living in a Subuniverse Within a Multiverse?

Jul 17, 2004 · Replies 1 · Jul 17, 2004

Replies: 1

Views: 3K

High School What Is Cosmology and How Does It Relate to the Speed of Light?

Jun 30, 2004 · Replies 5 · Jul 17, 2004

Replies: 5

Views: 3K

Graduate Is All Dark Energy Essentially Space?

Jul 12, 2004 · Replies 1 · Jul 16, 2004

Replies: 1

Views: 3K

Graduate Is the Singularity of a Black Hole Real or Theoretical?

Jul 16, 2004 · Replies 1 · Jul 16, 2004

Replies: 1

Views: 4K

Graduate Proof that gravity constant G = (3/4)(H^2)/[4(pi)(density)e^3]

Jul 14, 2004 · Replies 20 · Jul 16, 2004

Replies: 20

Views: 10K

Graduate Gravity mechanism predicts G to within 1.7%

Jul 1, 2004 · Replies 40 · Jul 16, 2004

2

Replies: 40

Views: 8K

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.

Top