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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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"Amount" red light in red shifted light

Feb 7, 2015 · Replies 8 · Feb 8, 2015

Replies: 8

Views: 2K

Does Hawking's Zero Energy Theory Resolve the Universe's Origin?

Jan 28, 2015 · Replies 6 · Feb 8, 2015

Replies: 6

Views: 3K

Wrong Explanations for the Luminosity of Main-Sequence Stars

Jan 30, 2015 · Replies 72 · Feb 7, 2015

3

Replies: 72

Views: 7K

Hawking Says, There are no black holes.

Jan 25, 2014 · Replies 31 · Feb 7, 2015

2

Replies: 31

Views: 8K

Is Space Really Empty and What Does That Mean for Propulsion?

Feb 5, 2015 · Replies 35 · Feb 7, 2015

2

Replies: 35

Views: 3K

Calculate time (or fraction of orb. period) of sat. in umbra

Feb 5, 2015 · Replies 2 · Feb 6, 2015

Replies: 2

Views: 4K

Multiverse and Eternal Inflation Disproved?

Feb 5, 2015 · Replies 8 · Feb 6, 2015

Replies: 8

Views: 4K

Entanglement as the fabric of space-time?

Feb 6, 2015 · Replies 2 · Feb 6, 2015

Replies: 2

Views: 2K

Asteroid 2004 BL86 and its small moon

Feb 4, 2015 · Replies 7 · Feb 6, 2015

Replies: 7

Views: 2K

Why do natural Moons revolve around planets?

Jan 30, 2015 · Replies 16 · Feb 6, 2015

Replies: 16

Views: 3K

What is the A Grand Tour of the Universe video series about?

Feb 5, 2015 · Replies 6 · Feb 5, 2015

Replies: 6

Views: 2K

The initial mass function (IMF) of main-sequence stars,

Dec 11, 2011 · Replies 16 · Feb 5, 2015

Replies: 16

Views: 4K

Can We Use Silicon Oxide Bags to Fly to the Moon?

Feb 3, 2015 · Replies 8 · Feb 5, 2015

Replies: 8

Views: 2K

Gravitational Collapse: How Long Does it Take?

Feb 3, 2015 · Replies 25 · Feb 5, 2015

Replies: 25

Views: 4K

What Would We See When Traveling to a Star at Light Speed?

Feb 3, 2015 · Replies 6 · Feb 4, 2015

Replies: 6

Views: 2K

A couple of new pix -- M42 and Eta Carina

Jan 18, 2015 · Replies 22 · Feb 3, 2015

Replies: 22

Views: 4K

What lies beyond the edge of the universe?

Feb 3, 2015 · Replies 10 · Feb 3, 2015

Replies: 10

Views: 2K

Heat and Magnetism: How Does the Sun Maintain Its Magnetism?

Feb 2, 2015 · Replies 2 · Feb 2, 2015

Replies: 2

Views: 1K

In depth Mars flight trajectory studies

Feb 1, 2015 · Replies 5 · Feb 2, 2015

Replies: 5

Views: 2K

Can a singularity expand in volume?

Feb 2, 2015 · Replies 5 · Feb 2, 2015

Replies: 5

Views: 2K

Did space time be created at the Big Bang?

Feb 2, 2015 · Replies 3 · Feb 2, 2015

Replies: 3

Views: 1K

What is the Jeans Anomaly and How Does it Relate to the Birth of a Star?

Feb 1, 2015 · Replies 2 · Feb 1, 2015

Replies: 2

Views: 1K

How to calculate the mass of a star using redshift?

Jan 30, 2015 · Replies 7 · Jan 31, 2015

Replies: 7

Views: 5K

Gravity -- Does gravity depends on atmosphere?

Jan 22, 2015 · Replies 31 · Jan 30, 2015

2

Replies: 31

Views: 6K

Heavy water mismatch between comet 67P and Earth's oceans

Dec 12, 2014 · Replies 17 · Jan 30, 2015

Replies: 17

Views: 3K

Space Hazards on ISS: How Much Is at Risk?

Jan 27, 2015 · Replies 9 · Jan 30, 2015

Replies: 9

Views: 3K

Dawn distance to Ceres ≈ distance to moon

Jan 7, 2015 · Replies 41 · Jan 29, 2015

2

Replies: 41

Views: 8K

Hypothetical Galactic Navigation System Question

Jan 29, 2015 · Replies 2 · Jan 29, 2015

Replies: 2

Views: 2K

Giant ring system around exoplanet discovered

Jan 28, 2015 · Replies 1 · Jan 28, 2015

Replies: 1

Views: 1K

What would Kessler Syndrome really look like?

Jan 25, 2015 · Replies 5 · Jan 28, 2015

Replies: 5

Views: 4K

Space Burial: A Futuristic Dream or a Possible Reality?

Jan 20, 2015 · Replies 23 · Jan 28, 2015

Replies: 23

Views: 3K

Microbial mats traced in Mars sediment? Noffke's hypothesis

Jan 8, 2015 · Replies 17 · Jan 28, 2015

Replies: 17

Views: 3K

Can Radio Telescopes Capture Detailed Images of Asteroids and Their Moons?

Jan 26, 2015 · Replies 7 · Jan 27, 2015

Replies: 7

Views: 2K

Comets' High Deuterium-to-Hydrogen Ratios Explained

Jan 6, 2015 · Replies 27 · Jan 27, 2015

Replies: 27

Views: 4K

Top Sky Viewing Apps for iPhone: A Comparison

May 4, 2014 · Replies 28 · Jan 27, 2015

Replies: 28

Views: 13K

Confused about binary star systems?

Jan 24, 2015 · Replies 6 · Jan 27, 2015

Replies: 6

Views: 2K

Will Dawn successfully enter orbit around Ceres?

Jan 27, 2015 · Replies 1 · Jan 27, 2015

Replies: 1

Views: 2K

Do Pulsars Really Produce Sounds or Are They Just Radio Wave Representations?

Jan 25, 2015 · Replies 10 · Jan 27, 2015

Replies: 10

Views: 3K

What is the definition of disc scalelength?

Jan 25, 2015 · Replies 6 · Jan 26, 2015

Replies: 6

Views: 2K

What Happens to Gravity When an Object Travels at the Speed of Light?

Jan 18, 2015 · Replies 21 · Jan 26, 2015

Replies: 21

Views: 3K

Diameter of Earth-like planet / gravitational force

Jan 21, 2015 · Replies 6 · Jan 25, 2015

Replies: 6

Views: 2K

Methods to find exoplanets more easily

Jan 24, 2015 · Replies 5 · Jan 25, 2015

Replies: 5

Views: 2K

How to determine the mass of a planet using redshift?

Jan 25, 2015 · Replies 4 · Jan 25, 2015

Replies: 4

Views: 2K

How can you tell what kind of orbit a body will have?

Jan 24, 2015 · Replies 5 · Jan 25, 2015

Replies: 5

Views: 2K

Can Weibel Instability Generate Cosmic Magnetic Fields?

Jan 24, 2015 · Replies 5 · Jan 24, 2015

Replies: 5

Views: 3K

Modelling The Sun’s Magnetic Field

Jan 23, 2015 · Replies 2 · Jan 23, 2015

Replies: 2

Views: 2K

What creates energy in a nova, supernova?

Jan 18, 2015 · Replies 3 · Jan 23, 2015

Replies: 3

Views: 2K

Stability of Orbital Resonance Ratios

Jan 20, 2015 · Replies 5 · Jan 22, 2015

Replies: 5

Views: 2K

Cosmology/QED/Astrophysics Lectures: Ideas Welcome!

Jan 22, 2015 · Replies 2 · Jan 22, 2015

Replies: 2

Views: 1K

Does energy level determine the smallest region of spacetime that can be probed?

Jan 21, 2015 · Replies 1 · Jan 21, 2015

Replies: 1

Views: 1K

Paradox on the Chandrasekhar Limit

Jan 11, 2015 · Replies 9 · Jan 20, 2015

Replies: 9

Views: 3K

Earth-Like Planets & Iron: Questions Answered

Jan 6, 2015 · Replies 51 · Jan 20, 2015

2

Replies: 51

Views: 7K

Why aren't there any space tugs in use?

Dec 12, 2014 · Replies 14 · Jan 19, 2015

Replies: 14

Views: 4K

Stargazing How Can I Build a Telescope?

Nov 25, 2014 · Replies 13 · Jan 18, 2015

Replies: 13

Views: 2K

Where Can I Find Comet Lovejoy in the Sky Right Now?

Jan 13, 2015 · Replies 15 · Jan 18, 2015

Replies: 15

Views: 2K

Earth-Sun Distance: Perfect for Life?

Dec 23, 2014 · Replies 24 · Jan 18, 2015

Replies: 24

Views: 6K

Image reduction and analysis software for windows

Oct 3, 2013 · Replies 6 · Jan 18, 2015

Replies: 6

Views: 6K

Diapl - Difference Image Analysis Package

Jan 17, 2015 · Replies 3 · Jan 18, 2015

Replies: 3

Views: 2K

Making sense of distance and speed of expanding universe

Jan 16, 2015 · Replies 12 · Jan 16, 2015

Replies: 12

Views: 3K

Quick help with equation P = a * T^4

Jan 15, 2015 · Replies 1 · Jan 16, 2015

Replies: 1

Views: 1K

Differential equation for motion within stars

Jan 12, 2015 · Replies 6 · Jan 15, 2015

Replies: 6

Views: 2K

What happens in the center of mass of binary star system ?

Jan 13, 2015 · Replies 9 · Jan 14, 2015

Replies: 9

Views: 4K

How to estimate/calculate stellar wind from a star?

Sep 18, 2014 · Replies 6 · Jan 13, 2015

Replies: 6

Views: 3K

Stargazing How Can I Build My Own Telescope Without a Tube?

Sep 22, 2007 · Replies 2 · Jan 12, 2015

Replies: 2

Views: 3K

Apparent size of objects at cosmological distances

Jan 3, 2015 · Replies 11 · Jan 12, 2015

Replies: 11

Views: 2K

What Factors Influence Radiation Production from Cosmic Ray Particles?

Jan 11, 2015 · Replies 2 · Jan 11, 2015

Replies: 2

Views: 2K

How do we accurately measure distances in space?

Jan 11, 2015 · Replies 8 · Jan 11, 2015

Replies: 8

Views: 2K

Space Bending: Questions & Answers

Jan 9, 2015 · Replies 3 · Jan 10, 2015

Replies: 3

Views: 1K

Trying to understand black holes

Nov 13, 2014 · Replies 7 · Jan 10, 2015

Replies: 7

Views: 2K

Jupiter gets up in Mercury's business - what happens next?

Jan 6, 2015 · Replies 6 · Jan 9, 2015

Replies: 6

Views: 2K

Spectacular Spiral May Encircle Milky Way

Jan 8, 2015 · Replies 4 · Jan 9, 2015

Replies: 4

Views: 2K

Is this evidence for a space-time continuum?

Jan 7, 2015 · Replies 7 · Jan 8, 2015

Replies: 7

Views: 2K

Binary Star Inclination Angle probability distribution

Jan 7, 2015 · Replies 6 · Jan 8, 2015

Replies: 6

Views: 4K

Depressurization in Space: Estimating Time and Effects of Meteor Penetration

Jan 5, 2015 · Replies 5 · Jan 8, 2015

Replies: 5

Views: 2K

Dennis Overby article on Merging Black Holes

Jan 7, 2015 · Replies 1 · Jan 7, 2015

Replies: 1

Views: 1K

Mercedes concept "mobile living space"

Jan 6, 2015 · Replies 10 · Jan 7, 2015

Replies: 10

Views: 2K

A question about Black Holes and their Gravity

Jan 7, 2015 · Replies 13 · Jan 7, 2015

Replies: 13

Views: 2K

Gyrochronology: A Spin-Down Clock for Cool Stars

Jan 6, 2015 · Replies 2 · Jan 7, 2015

Replies: 2

Views: 1K

What Secrets Does the Milky Way's Core Jet Reveal About Galactic Dynamics?

Jan 6, 2015 · Replies 3 · Jan 7, 2015

Replies: 3

Views: 2K

Planetary motion as perpetual motion?

Jan 5, 2015 · Replies 3 · Jan 7, 2015

Replies: 3

Views: 2K

How can I find the distance between Epsilon Indi and Tau Ceti?

Jan 6, 2015 · Replies 2 · Jan 6, 2015

Replies: 2

Views: 2K

Reading of planets billions of light years away

Jan 5, 2015 · Replies 7 · Jan 5, 2015

Replies: 7

Views: 3K

Planetary orbit disruption by passing stars

Jan 5, 2015 · Replies 2 · Jan 5, 2015

Replies: 2

Views: 1K

What new theories are being proposed to explain the beginning of the universe?

Jan 2, 2015 · Replies 4 · Jan 5, 2015

Replies: 4

Views: 2K

How the last days look like just before a tidal lock?

Jan 3, 2015 · Replies 3 · Jan 5, 2015

Replies: 3

Views: 3K

Forming Strange Quarks in Strange Stars

Jan 2, 2015 · Replies 6 · Jan 5, 2015

Replies: 6

Views: 2K

Converting/Creating Coordinate Systems for Other Planets?

Dec 14, 2014 · Replies 5 · Jan 5, 2015

Replies: 5

Views: 2K

Can someone check my work for this problem I thought of?

Jan 4, 2015 · Replies 3 · Jan 4, 2015

Replies: 3

Views: 1K

What is the value of k in the Moon's orbital precession?

Nov 28, 2014 · Replies 6 · Jan 4, 2015

Replies: 6

Views: 3K

Best way to see Andromeda galaxy

Dec 31, 2014 · Replies 6 · Jan 4, 2015

Replies: 6

Views: 5K

Discover the Spectacular Sky Color on a K4.5V Main Sequence Star"

Jan 3, 2015 · Replies 7 · Jan 4, 2015

Replies: 7

Views: 2K

Mass Inflation Instability in Kerr and Reisnerr black holes.

Dec 29, 2014 · Replies 4 · Jan 4, 2015

Replies: 4

Views: 5K

How Do You Calculate the Correct Launch Window for an Inclined Orbit Around Io?

Sep 6, 2014 · Replies 3 · Jan 4, 2015

Replies: 3

Views: 3K

Simulating Planetary Collisions: Outcomes & Results

Jan 2, 2015 · Replies 1 · Jan 2, 2015

Replies: 1

Views: 2K

Calculate Sun and Moon Astronomical Parameters with VSOP87 Accuracy

Dec 28, 2014 · Replies 3 · Jan 2, 2015

Replies: 3

Views: 2K

On the mathematics of interstellar colonization

Jan 2, 2015 · Replies 7 · Jan 2, 2015

Replies: 7

Views: 2K

Can i create a star from Jupiter?

Dec 30, 2014 · Replies 28 · Jan 2, 2015

Replies: 28

Views: 4K

Why Equator only exists for a rotating body like Earth?

Dec 26, 2014 · Replies 17 · Jan 2, 2015

Replies: 17

Views: 3K

Pandora (Borderlands): Is this planet possible?

Dec 28, 2014 · Replies 14 · Dec 31, 2014

Replies: 14

Views: 10K

Where did Schwarzschild get his information for his black hole model?

Dec 22, 2014 · Replies 19 · Dec 30, 2014

Replies: 19

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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