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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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Can photons escape a charged, spinning black hole?

Apr 1, 2004 · Replies 2 · Apr 1, 2004

Replies: 2

Views: 3K

Accepted value for Omega of radiation energy density

Mar 31, 2004 · Replies 1 · Apr 1, 2004

Replies: 1

Views: 3K

How are space and time related in the space-time ripple-nipple phenomenon?

Mar 28, 2004 · Replies 3 · Apr 1, 2004

Replies: 3

Views: 3K

Have You Ever Seen the Green Flash?

Mar 31, 2004 · Replies 1 · Mar 31, 2004

Replies: 1

Views: 3K

Stargazing Can the Hubble Space Telescope Really See 14.5 Billion Years into the Past?

Mar 29, 2004 · Replies 6 · Mar 30, 2004

Replies: 6

Views: 3K

Methane on Mars could signal life [now]

Mar 29, 2004 · Replies 1 · Mar 30, 2004

Replies: 1

Views: 3K

Alternate Explanations for Redshift in the Universe

Mar 23, 2004 · Replies 25 · Mar 30, 2004

Replies: 25

Views: 5K

Question about the first supernova

Mar 29, 2004 · Replies 2 · Mar 29, 2004

Replies: 2

Views: 2K

Radio search for ET draws a blank

Mar 26, 2004 · Replies 2 · Mar 28, 2004

Replies: 2

Views: 2K

Terraforming Mars? Pros, Cons and Implications

Mar 27, 2004 · Replies 10 · Mar 28, 2004

Replies: 10

Views: 4K

Supernova could wipe out all life on earth ?

Mar 23, 2004 · Replies 17 · Mar 28, 2004

Replies: 17

Views: 7K

How do the lava flows on Venus reach such incredible lengths?

Mar 26, 2004 · Replies 2 · Mar 28, 2004

Replies: 2

Views: 4K

How Does Launch Angle Affect Satellite Targeting in Orbital Mechanics?

Mar 27, 2004 · Replies 21 · Mar 27, 2004

Replies: 21

Views: 5K

The Mystery of Star Formation: Why Do Gas Clouds Collapse?

Mar 26, 2004 · Replies 4 · Mar 27, 2004

Replies: 4

Views: 2K

Living on the Inside of a Hollowed-Out Planet: Gravity, Crust Thickness & More

Mar 19, 2004 · Replies 16 · Mar 26, 2004

Replies: 16

Views: 4K

NASA Announces Evidence of Briny Water on Ancient Mars - Implications for Life

Mar 24, 2004 · Replies 2 · Mar 25, 2004

Replies: 2

Views: 2K

Masters of Space: Stop USA Weaponization - A Media Blackout

Mar 16, 2004 · Replies 16 · Mar 23, 2004

Replies: 16

Views: 3K

Working on a dossier project for my Java class

Feb 23, 2004 · Replies 2 · Mar 23, 2004

Replies: 2

Views: 3K

How realistic is the concept of wormholes for space travel?

Mar 23, 2004 · Replies 2 · Mar 23, 2004

Replies: 2

Views: 3K

Another MAJOR finding by Mars rover to be announced Tuesday.

Mar 22, 2004 · Replies 5 · Mar 23, 2004

Replies: 5

Views: 4K

Is The Speed Of Light Slowing Down ?

Mar 21, 2004 · Replies 3 · Mar 23, 2004

Replies: 3

Views: 6K

Earth orbit vs. changing mass of Sun

Mar 22, 2004 · Replies 2 · Mar 23, 2004

Replies: 2

Views: 4K

How can the distance to nearby stars be calculated using the parallax method?

Mar 22, 2004 · Replies 2 · Mar 23, 2004

Replies: 2

Views: 3K

Can You See Light in a Black Hole?

Mar 14, 2004 · Replies 15 · Mar 22, 2004

Replies: 15

Views: 4K

Requirements for a habitable planet

Mar 20, 2004 · Replies 14 · Mar 22, 2004

Replies: 14

Views: 6K

Find Astronomical Discrepancies at www.BadAstronomy.com

Mar 20, 2004 · Replies 4 · Mar 22, 2004

Replies: 4

Views: 4K

How long does a mission to Mars take, including crew stay?

Mar 20, 2004 · Replies 4 · Mar 22, 2004

Replies: 4

Views: 6K

Celestial Reflections: How Far Can Radars Reach in Space?

Dec 7, 2003 · Replies 9 · Mar 21, 2004

Replies: 9

Views: 4K

What Are the Largest Stars in Our Universe?

Mar 4, 2004 · Replies 7 · Mar 21, 2004

Replies: 7

Views: 5K

Gravity of Black Holes: What Escapes and What Doesn't?

Mar 20, 2004 · Replies 3 · Mar 20, 2004

Replies: 3

Views: 4K

Bomb Explosion in Space: What Would Happen?

Mar 13, 2004 · Replies 28 · Mar 20, 2004

Replies: 28

Views: 9K

How Does Gravity Warp Space-Time According to Einstein's Theory?

Mar 19, 2004 · Replies 4 · Mar 20, 2004

Replies: 4

Views: 2K

Asteroid 2004 FH: Close Flyby and Potential Impact Creates Concern

Mar 19, 2004 · Replies 2 · Mar 20, 2004

Replies: 2

Views: 5K

Dark matter affecting galaxy rotation

Mar 18, 2004 · Replies 4 · Mar 19, 2004

Replies: 4

Views: 4K

Will Advertisements Dominate the Night Sky?

Mar 11, 2004 · Replies 6 · Mar 19, 2004

Replies: 6

Views: 2K

Australian Scientists Confirm Past Life On Mars

Mar 17, 2004 · Replies 3 · Mar 19, 2004

Replies: 3

Views: 4K

When is a Planet not a Planet ?

Mar 17, 2004 · Replies 2 · Mar 19, 2004

Replies: 2

Views: 7K

What did the Mars rovers discover about Earth from the Martian surface?

Mar 15, 2004 · Replies 2 · Mar 19, 2004

Replies: 2

Views: 4K

What Are Edna and Quaoar in Our Solar System?

Mar 18, 2004 · Replies 2 · Mar 19, 2004

Replies: 2

Views: 3K

Confidence Levels: Andrew R. Liddle's Astronomy Centre Paper

Mar 8, 2004 · Replies 4 · Mar 19, 2004

Replies: 4

Views: 4K

Source of gammas from Milky Way centre

Mar 18, 2004 · Replies 5 · Mar 19, 2004

Replies: 5

Views: 2K

What Causes Galactic Plains?

Mar 18, 2004 · Replies 5 · Mar 18, 2004

Replies: 5

Views: 5K

What is the largest known orbit?

Mar 18, 2004 · Replies 2 · Mar 18, 2004

Replies: 2

Views: 3K

Avoiding A Crash Course In Planetary Defense

Mar 11, 2004 · Replies 3 · Mar 18, 2004

Replies: 3

Views: 3K

Spirit Rover Nightshot 'object'?

Mar 16, 2004 · Replies 7 · Mar 17, 2004

Replies: 7

Views: 3K

Plotting 180 Degrees Apart Galaxies in Spacetime Diagram

Mar 15, 2004 · Replies 1 · Mar 17, 2004

Replies: 1

Views: 3K

Unveiling the Ultra Deep Field: The Big Bang Blast of 10,000 Galaxies

Mar 10, 2004 · Replies 3 · Mar 16, 2004

Replies: 3

Views: 6K

An ignorant question about cosmology

Mar 12, 2004 · Replies 8 · Mar 16, 2004

Replies: 8

Views: 3K

Osiris, a chthonian planet - a very physical hell?

Feb 6, 2004 · Replies 8 · Mar 16, 2004

Replies: 8

Views: 6K

How far back in time can we observe with our current technology and telescopes?

Feb 16, 2004 · Replies 28 · Mar 16, 2004

Replies: 28

Views: 6K

How Does a Crystal Turn Space Inside Out?

Mar 10, 2004 · Replies 5 · Mar 16, 2004

Replies: 5

Views: 3K

Are there practical applications for l2 in mathematics and physics?

Mar 15, 2004 · Replies 3 · Mar 16, 2004

Replies: 3

Views: 3K

Have Scientists Discovered a 10th Planet in Our Solar System?

Mar 15, 2004 · Replies 10 · Mar 15, 2004

Replies: 10

Views: 5K

Bush's Moon-Mars Initiative: Political Tool or Real Space Program?

Mar 15, 2004 · Replies 6 · Mar 15, 2004

Replies: 6

Views: 4K

Hubble Supernova Discovery: WOW BEAUTIFUL

Mar 10, 2004 · Replies 4 · Mar 11, 2004

Replies: 4

Views: 2K

Exploring the Limits of GRBs: A Look at the Integrated Sachs-Wolfe Effect

Oct 31, 2003 · Replies 12 · Mar 11, 2004

Replies: 12

Views: 3K

Type Ia Supernovae Evidence of Cosmic Deceleration & Acceleration

Mar 9, 2004 · Replies 2 · Mar 11, 2004

Replies: 2

Views: 3K

Is it Possible to Fly an Airplane on Mars?

Mar 10, 2004 · Replies 3 · Mar 10, 2004

Replies: 3

Views: 3K

Understanding Birkeland Currents in Space

Jul 18, 2003 · Replies 6 · Mar 10, 2004

Replies: 6

Views: 7K

NASA Finds Evidence of "Soaking Wet" Mars with Rover

Mar 2, 2004 · Replies 7 · Mar 8, 2004

Replies: 7

Views: 4K

Does the MBR display orbital motion relative to us?

Mar 7, 2004 · Replies 5 · Mar 7, 2004

Replies: 5

Views: 3K

What can (US) amateur astronomers do to help save Hubble?

Mar 5, 2004 · Replies 3 · Mar 7, 2004

Replies: 3

Views: 3K

Remind you that Jupiter is really close to Earth

Mar 6, 2004 · Replies 4 · Mar 6, 2004

Replies: 4

Views: 3K

Astronomy Project Ideas: Star Collision & More!

Feb 15, 2004 · Replies 4 · Mar 6, 2004

Replies: 4

Views: 3K

Can Stars Really Collide?

Mar 4, 2004 · Replies 3 · Mar 6, 2004

Replies: 3

Views: 4K

WMAP Data Distortion: Recent Evidence

Feb 27, 2004 · Replies 18 · Mar 6, 2004

Replies: 18

Views: 5K

How can gyros and fins on spaceships improve long-term survival in space?

Feb 29, 2004 · Replies 5 · Mar 6, 2004

Replies: 5

Views: 5K

Under abundance of lithium may solve existence DM

Mar 6, 2004 · Replies 2 · Mar 6, 2004

Replies: 2

Views: 3K

Unravelling the Mystery of Dark Matter

Mar 5, 2004 · Replies 2 · Mar 5, 2004

Replies: 2

Views: 2K

Oscilating Universe WITH Perpetual Expansion

Feb 27, 2004 · Replies 2 · Mar 5, 2004

Replies: 2

Views: 3K

Why Does an Observer Not See Entering a Black Hole?

Mar 4, 2004 · Replies 2 · Mar 5, 2004

Replies: 2

Views: 2K

Measuring Astronomical Distances

Feb 28, 2004 · Replies 3 · Mar 4, 2004

Replies: 3

Views: 3K

Earth almost put on impact alert

Feb 25, 2004 · Replies 12 · Mar 4, 2004

Replies: 12

Views: 3K

What is the significance of Fermat's Last Theorem in modern mathematics?

Feb 1, 2004 · Replies 54 · Mar 4, 2004

2

Replies: 54

Views: 8K

What does space look like from space?

Feb 28, 2004 · Replies 7 · Mar 3, 2004

Replies: 7

Views: 22K

Comparing Telescopes: Konus 500 vs Konus 200 vs Mead LDX55

Mar 3, 2004 · Replies 2 · Mar 3, 2004

Replies: 2

Views: 6K

Roser Pello's galaxy is receding at 2.3 times the speed of light

Mar 2, 2004 · Replies 6 · Mar 3, 2004

Replies: 6

Views: 4K

Observe all the ages of the universe

Mar 2, 2004 · Replies 3 · Mar 2, 2004

Replies: 3

Views: 2K

Opportunity makes 'significant' finding

Mar 1, 2004 · Replies 2 · Mar 2, 2004

Replies: 2

Views: 2K

UFO's trapped in the black hole

Mar 2, 2004 · Replies 2 · Mar 2, 2004

Replies: 2

Views: 8K

Universe Age: 13 Billion Years, Revealed by Light Travel

Feb 19, 2004 · Replies 26 · Mar 2, 2004

Replies: 26

Views: 5K

Effects of acceleration on black holes.

Feb 14, 2004 · Replies 2 · Mar 1, 2004

Replies: 2

Views: 3K

How Does the Gap Theory Unify Spacetime and Quantum Mechanics?

Jun 1, 2003 · Replies 27 · Mar 1, 2004

Replies: 27

Views: 7K

Does gravity play a role in the expansion of the universe?

Feb 19, 2004 · Replies 9 · Mar 1, 2004

Replies: 9

Views: 3K

Spacefuel: Utilizing Iron-Dust as a Cheap and Efficient Fuel Source

Feb 5, 2004 · Replies 3 · Feb 29, 2004

Replies: 3

Views: 2K

Physics in distant galaxies - same as on Earth? (history question)

Feb 24, 2004 · Replies 10 · Feb 28, 2004

Replies: 10

Views: 4K

Dark Age: Galaxy & Quasar Formation ?

Feb 27, 2004 · Replies 2 · Feb 27, 2004

Replies: 2

Views: 4K

Poll

Vote for Hybrid Inflation: Inflation Poll

Feb 26, 2004 · Replies 3 · Feb 27, 2004

Replies: 3

Views: 2K

Sunspots: Viewing at Home - Simplest Method

Feb 25, 2004 · Replies 6 · Feb 26, 2004

Replies: 6

Views: 3K

Discernment , duality and perception ,singularity (not black hole)

Feb 22, 2004 · Replies 4 · Feb 26, 2004

Replies: 4

Views: 4K

Ekpyrotic model and CMB observations?

Feb 25, 2004 · Replies 3 · Feb 25, 2004

Replies: 3

Views: 3K

Existence of dark matter questioned

Feb 14, 2004 · Replies 27 · Feb 25, 2004

Replies: 27

Views: 6K

Comparing different kinds of dark energy

Feb 24, 2004 · Replies 1 · Feb 25, 2004

Replies: 1

Views: 3K

Amateur astronomer finds new nebula

Feb 13, 2004 · Replies 3 · Feb 23, 2004

Replies: 3

Views: 4K

Space Tourism Survey: Answers Wanted!

Jan 15, 2004 · Replies 20 · Feb 21, 2004

Replies: 20

Views: 4K

Crystal Core Discovered in Dying Star

Feb 18, 2004 · Replies 7 · Feb 21, 2004

Replies: 7

Views: 4K

Member of Michio Kakus's organisation

Feb 21, 2004 · Replies 1 · Feb 21, 2004

Replies: 1

Views: 3K

Falling Back to Orbit: Can Rockets Change Their Orbit?

Feb 20, 2004 · Replies 1 · Feb 20, 2004

Replies: 1

Views: 2K

What is the largest object discovered in the Solar System since Pluto?

Feb 20, 2004 · Replies 1 · Feb 20, 2004

Replies: 1

Views: 2K

Gravity acting as a repulsive forces at long distances

Jan 24, 2004 · Replies 4 · Feb 20, 2004

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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