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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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Travelling to the other world by sending data

Nov 21, 2009 · Replies 1 · Nov 21, 2009

Replies: 1

Views: 2K

Seeking Information on the R-process

Nov 21, 2009 · Replies 1 · Nov 21, 2009

Replies: 1

Views: 2K

Chemical composition of solar system

Nov 20, 2009 · Replies 6 · Nov 20, 2009

Replies: 6

Views: 5K

Unravelling the History of Stars: 14 Billion Years

Nov 19, 2009 · Replies 2 · Nov 20, 2009

Replies: 2

Views: 7K

Can a photon catch up to your eye within a black hole?

Nov 20, 2009 · Replies 3 · Nov 20, 2009

Replies: 3

Views: 10K

Lunar Reconnaissance Orbiter Photos

Nov 17, 2009 · Replies 4 · Nov 20, 2009

Replies: 4

Views: 3K

How To Find Angular Momentum of Elliptical Orbits

Nov 18, 2009 · Replies 2 · Nov 19, 2009

Replies: 2

Views: 3K

Hydrostatic Equilibrium in General Relativity

Nov 18, 2009 · Replies 3 · Nov 19, 2009

Replies: 3

Views: 3K

Jupiter's Equatorial Rotation Period

Nov 19, 2009 · Replies 2 · Nov 19, 2009

Replies: 2

Views: 2K

What Causes Earth's Elliptical Orbit?

Apr 6, 2007 · Replies 29 · Nov 19, 2009

Replies: 29

Views: 36K

The more you learn, the less you know

Nov 12, 2009 · Replies 9 · Nov 19, 2009

Replies: 9

Views: 10K

Understanding Earth's Rotation: The Effects on Telescope Observations

Nov 18, 2009 · Replies 1 · Nov 18, 2009

Replies: 1

Views: 3K

How Does Relativity Affect Mass and Gravity in High-Speed Orbits?

Nov 11, 2009 · Replies 11 · Nov 18, 2009

Replies: 11

Views: 3K

Stellar Evolution - Detailed Colour Magnitude (HR) Diagram

Nov 11, 2009 · Replies 12 · Nov 18, 2009

Replies: 12

Views: 4K

The shape of our solar system's orbits.

Nov 7, 2009 · Replies 35 · Nov 17, 2009

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Replies: 35

Views: 14K

How Is Mars' Gravity Determined Without Direct Measurement?

Nov 16, 2009 · Replies 7 · Nov 17, 2009

Replies: 7

Views: 5K

Planets Forming Inside vs. Outside the Ice Line

Nov 17, 2009 · Replies 2 · Nov 17, 2009

Replies: 2

Views: 2K

How would you see an Event horizon?

Nov 1, 2009 · Replies 9 · Nov 17, 2009

Replies: 9

Views: 6K

NASA Confirms Water on Moon - Exciting News!

Nov 13, 2009 · Replies 9 · Nov 17, 2009

Replies: 9

Views: 3K

Question about the orbit between Mars and Earth

Nov 16, 2009 · Replies 6 · Nov 16, 2009

Replies: 6

Views: 6K

Does anyone know how to find this paper?

Feb 1, 2004 · Replies 10 · Nov 16, 2009

Replies: 10

Views: 4K

Kerr Black Hole & Keplerian Stable Orbit

Nov 14, 2009 · Replies 4 · Nov 16, 2009

Replies: 4

Views: 4K

Stargazing Understanding the Magnification of a Telescope: Why is M = f_o / f_e?

Oct 23, 2009 · Replies 3 · Nov 15, 2009

Replies: 3

Views: 3K

Pale blue dot: what causes the bands?

Oct 15, 2009 · Replies 5 · Nov 14, 2009

Replies: 5

Views: 5K

A non-technical explanation for FTL quasar motions

Nov 12, 2009 · Replies 3 · Nov 14, 2009

Replies: 3

Views: 2K

How Does Gravity Propagate Backwards in Time?

Nov 11, 2009 · Replies 8 · Nov 13, 2009

Replies: 8

Views: 5K

Is it possible for a single super-massive black hole

Nov 13, 2009 · Replies 6 · Nov 13, 2009

Replies: 6

Views: 3K

Is Our Moon Moving Away? The Mystery Unraveled

Nov 6, 2009 · Replies 12 · Nov 13, 2009

Replies: 12

Views: 3K

Why is the Sky Blue? Understanding Rayleigh Scattering Explained

Nov 12, 2009 · Replies 3 · Nov 13, 2009

Replies: 3

Views: 3K

Reasons why LCROSS is a safe mission

Jun 22, 2009 · Replies 18 · Nov 13, 2009

Replies: 18

Views: 4K

Restructuring of the solar system theory

Nov 10, 2009 · Replies 10 · Nov 13, 2009

Replies: 10

Views: 3K

The Universe Model: A Simple Study of Infinite Hydrogen Atoms

Sep 2, 2003 · Replies 30 · Nov 12, 2009

2

Replies: 30

Views: 8K

How to much mass does it take to change Neptune's Orbit?

Nov 10, 2009 · Replies 1 · Nov 12, 2009

Replies: 1

Views: 3K

Nuetron star collapses to B.H., a final plunge of matter and energy?

Nov 9, 2009 · Replies 12 · Nov 12, 2009

Replies: 12

Views: 4K

Unravelling the Mysteries of Meteor Showers

Nov 10, 2009 · Replies 3 · Nov 12, 2009

Replies: 3

Views: 4K

A question about dark energy and the expansion/acceleration of the Universe.

Nov 12, 2009 · Replies 1 · Nov 12, 2009

Replies: 1

Views: 2K

Could Everything Be Contracting to a Point Instead of Accelerating Away?

Nov 10, 2009 · Replies 8 · Nov 12, 2009

Replies: 8

Views: 2K

Calculation of orbital speed for given eccentricity

Nov 11, 2009 · Replies 2 · Nov 12, 2009

Replies: 2

Views: 18K

How can artificial gravity be created on space stations using rotating rings?

Nov 10, 2009 · Replies 4 · Nov 12, 2009

Replies: 4

Views: 4K

Are the Perseids meteor shower the best in recent years?

Aug 8, 2009 · Replies 7 · Nov 11, 2009

Replies: 7

Views: 4K

Supernova's Gamma Rays and Comets

Nov 6, 2009 · Replies 6 · Nov 11, 2009

Replies: 6

Views: 3K

Difference between Supernova vs. Nova?

Nov 7, 2009 · Replies 8 · Nov 11, 2009

Replies: 8

Views: 21K

Is Star Formation Just a Matter of Lag Time?

Nov 9, 2009 · Replies 3 · Nov 10, 2009

Replies: 3

Views: 2K

Weightlessness discoveries in the history of the human race

Nov 9, 2009 · Replies 2 · Nov 9, 2009

Replies: 2

Views: 2K

A theory and questions about physics/astro and quantum.

Nov 8, 2009 · Replies 8 · Nov 9, 2009

Replies: 8

Views: 3K

Inverse relationship - neutron flux density with sunspot cycle

Nov 8, 2009 · Replies 3 · Nov 8, 2009

Replies: 3

Views: 6K

Origin of Planets: How Was Our Planet Formed?

Nov 5, 2009 · Replies 8 · Nov 6, 2009

Replies: 8

Views: 3K

Why Can't Space Ships Use Propellers or Jets for Manoeuvrability?

Nov 1, 2009 · Replies 7 · Nov 6, 2009

Replies: 7

Views: 3K

Question about a Carl Zeiss lens

Nov 5, 2009 · Replies 13 · Nov 6, 2009

Replies: 13

Views: 9K

Planet Rotation: Questions & Answers

Oct 31, 2009 · Replies 3 · Nov 6, 2009

Replies: 3

Views: 3K

Are Black Holes Unfalsifiable and Therefore Not Science?

Oct 15, 2009 · Replies 73 · Nov 5, 2009

3

Replies: 73

Views: 12K

Absence of dust on moon and material sciences

Nov 3, 2009 · Replies 5 · Nov 5, 2009

Replies: 5

Views: 3K

What is the True Density of Space?

Mar 26, 2005 · Replies 29 · Nov 4, 2009

Replies: 29

Views: 17K

Textbook on Mathematical Astronomy

Oct 31, 2009 · Replies 2 · Nov 3, 2009

Replies: 2

Views: 3K

Elliptical orbits and focal points

Nov 1, 2009 · Replies 2 · Nov 3, 2009

Replies: 2

Views: 4K

Can Gravitational Lensing Cause a Star to Appear Twice Simultaneously?

Oct 28, 2009 · Replies 6 · Nov 3, 2009

Replies: 6

Views: 4K

Mercury not travelling in a straight line?

Nov 2, 2009 · Replies 1 · Nov 2, 2009

Replies: 1

Views: 3K

What do u recoment for somwhone thats intrested in astronomy?

Nov 2, 2009 · Replies 1 · Nov 2, 2009

Replies: 1

Views: 2K

Galactic Suite and space tourism

Nov 2, 2009 · Replies 1 · Nov 2, 2009

Replies: 1

Views: 2K

Help with Orbital Mechanics: First Post

Nov 2, 2009 · Replies 1 · Nov 2, 2009

Replies: 1

Views: 3K

Jets from Black Holes - do they carry momentum?

Oct 23, 2009 · Replies 5 · Nov 2, 2009

Replies: 5

Views: 3K

What Is the Gravity Value on Neutron Stars?

Nov 2, 2009 · Replies 2 · Nov 2, 2009

Replies: 2

Views: 2K

Stargazing Good Beginner Telescope: Best Options Under $200

Oct 16, 2009 · Replies 6 · Nov 2, 2009

Replies: 6

Views: 4K

Southwest Sky Constellations: Most Recognized Patterns

Oct 31, 2009 · Replies 3 · Nov 1, 2009

Replies: 3

Views: 2K

What Happens to a Stationary Bowling Ball in an Expanding Universe?

Oct 30, 2009 · Replies 4 · Oct 31, 2009

Replies: 4

Views: 2K

Mapping Underground Caves/Tunnels on the Moon/Mars

Oct 25, 2009 · Replies 2 · Oct 31, 2009

Replies: 2

Views: 5K

What is the universe expanding into?

Oct 30, 2009 · Replies 3 · Oct 30, 2009

Replies: 3

Views: 3K

Help with Spectroscopy in Astronomy

Oct 30, 2009 · Replies 1 · Oct 30, 2009

Replies: 1

Views: 2K

Unraveling the Mysteries of the Expanding Universe: Age and Size

Mar 14, 2009 · Replies 7 · Oct 30, 2009

Replies: 7

Views: 4K

Trying to comprehend the explosive power of a gamma ray burst?

Oct 30, 2009 · Replies 1 · Oct 30, 2009

Replies: 1

Views: 3K

Why Do We Experience Night in Our Universe?

Feb 13, 2009 · Replies 38 · Oct 30, 2009

2

Replies: 38

Views: 10K

Space.com says intergalactic hydrogen gas absorbs all optical light

Oct 29, 2009 · Replies 7 · Oct 29, 2009

Replies: 7

Views: 3K

Chance of Planet Formation without Stars

Oct 28, 2009 · Replies 19 · Oct 29, 2009

Replies: 19

Views: 5K

Why most of the planetary orbits are ellipitical?

Nov 14, 2007 · Replies 18 · Oct 29, 2009

Replies: 18

Views: 5K

Why is earth's path is elliptical?

Oct 11, 2007 · Replies 8 · Oct 29, 2009

Replies: 8

Views: 6K

So, what are all the known paradoxs in Astronomy?

Oct 28, 2009 · Replies 4 · Oct 29, 2009

Replies: 4

Views: 3K

A hypothetical space elevator question.

Oct 26, 2009 · Replies 6 · Oct 28, 2009

Replies: 6

Views: 4K

Main sequence lifetime problem

Oct 26, 2009 · Replies 3 · Oct 27, 2009

Replies: 3

Views: 3K

My dwarf is bigger than your dwarf

Oct 26, 2009 · Replies 9 · Oct 27, 2009

Replies: 9

Views: 3K

Planet's Julian Date of a point in orbit

Oct 27, 2009 · Replies 1 · Oct 27, 2009

Replies: 1

Views: 3K

Planets <-> solar systems <-> galaxies

Oct 26, 2009 · Replies 10 · Oct 27, 2009

Replies: 10

Views: 4K

Comet C/2008 O2 McNaught photos?

Oct 26, 2009 · Replies 1 · Oct 26, 2009

Replies: 1

Views: 2K

Mass-luminosity relation problem

Oct 16, 2009 · Replies 19 · Oct 26, 2009

Replies: 19

Views: 7K

What equations are needed for calculating Keplerian orbital mechanics?

Oct 24, 2009 · Replies 7 · Oct 26, 2009

Replies: 7

Views: 3K

Using Technology to stop the expansion of space.

Oct 26, 2009 · Replies 2 · Oct 26, 2009

Replies: 2

Views: 2K

What Would Happen if You Cut the Earth in Half?

Oct 25, 2009 · Replies 6 · Oct 26, 2009

Replies: 6

Views: 8K

Find Accurate Weather Logs for Your Astronomy Observations | Natski

Oct 22, 2009 · Replies 7 · Oct 25, 2009

Replies: 7

Views: 3K

Energy and momentum flux in the sun and Newton's 3rd law.

Oct 23, 2009 · Replies 2 · Oct 25, 2009

Replies: 2

Views: 3K

How to Fix an Error with the Setup of IDL/Healpix?

Oct 24, 2009 · Replies 1 · Oct 24, 2009

Replies: 1

Views: 3K

How Far Can a 300 mm Telescope Resolve a Double Star Separated by 10 AU?

Oct 24, 2009 · Replies 1 · Oct 24, 2009

Replies: 1

Views: 2K

Changing Earth's Rotation: Impact on Gravity and Mass Loss

Oct 16, 2009 · Replies 22 · Oct 24, 2009

Replies: 22

Views: 19K

A god switchs off the nuclear fires in our sun tonight, do I have to worry?

Oct 23, 2009 · Replies 7 · Oct 24, 2009

Replies: 7

Views: 3K

How do we accurately measure the speed of light without frames of reference?

Oct 23, 2009 · Replies 3 · Oct 23, 2009

Replies: 3

Views: 2K

Are L4 and L5 Lagrange Points Stable with M1/M2 ≥ 24.96?

Oct 23, 2009 · Replies 1 · Oct 23, 2009

Replies: 1

Views: 2K

Period of Aquila (Latin: 'eagle') constellation

Oct 20, 2009 · Replies 11 · Oct 22, 2009

Replies: 11

Views: 4K

I need to shield Earth's Gravitational force.

Oct 22, 2009 · Replies 1 · Oct 22, 2009

Replies: 1

Views: 3K

Could gravitational waves form interference patterns?

Sep 19, 2009 · Replies 27 · Oct 22, 2009

Replies: 27

Views: 14K

Is the Kinematics of 3D Space Truss Affected by Closed Loops in the System?

Oct 5, 2009 · Replies 35 · Oct 22, 2009

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Replies: 35

Views: 12K

Is Gravitational Shear Limited to Gravitational Lensing?

Oct 20, 2009 · Replies 1 · Oct 21, 2009

Replies: 1

Views: 2K

How Does Time Dilation Impact the Calculated Age of the Universe?

Oct 20, 2009 · Replies 4 · Oct 21, 2009

Replies: 4

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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