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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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Calculating the Hubble Constant at Different Redshifts

Mar 10, 2011 · Replies 3 · Mar 18, 2011

Replies: 3

Views: 6K

Naked singularities and traversable wormholes

Feb 24, 2011 · Replies 6 · Mar 18, 2011

Replies: 6

Views: 5K

Travel in Space: Electric or Fuel?

Mar 14, 2011 · Replies 4 · Mar 18, 2011

Replies: 4

Views: 2K

Uranus’ atmosphere – creative help

Jan 4, 2011 · Replies 43 · Mar 18, 2011

2

Replies: 43

Views: 23K

Is the fate of black dwarfs to become neutron stars without proton decay?

Mar 16, 2011 · Replies 4 · Mar 18, 2011

Replies: 4

Views: 5K

EDIT: Guys I just need someone to take me under their wing for a

Mar 18, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

Views: 2K

Size comparison, from the moon to the largest known star

Mar 18, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

Views: 7K

Evidence for spatial variantion of the fine structure constant

Mar 16, 2011 · Replies 4 · Mar 18, 2011

Replies: 4

Views: 2K

How did the planets acquire their spin?

Mar 31, 2009 · Replies 30 · Mar 18, 2011

2

Replies: 30

Views: 8K

Dark Energy: Mass, Distance & Gravity Relationships

Mar 17, 2011 · Replies 1 · Mar 17, 2011

Replies: 1

Views: 2K

Is my analysis of star observations in Orion accurate?

Mar 11, 2011 · Replies 7 · Mar 17, 2011

Replies: 7

Views: 3K

Understanding Retrograde Orbit: Velocity Requirements for Artificial Satellites

Mar 4, 2011 · Replies 10 · Mar 17, 2011

Replies: 10

Views: 9K

Pulsating variable star mathematics question

Mar 15, 2011 · Replies 1 · Mar 17, 2011

Replies: 1

Views: 2K

Spherical star in a hydrostatic equilibrium

Mar 14, 2011 · Replies 5 · Mar 17, 2011

Replies: 5

Views: 3K

Velocity of a star for Doppler Spectroscopy

Mar 17, 2011 · Replies 2 · Mar 17, 2011

Replies: 2

Views: 3K

The degree of order in the Universe

Mar 14, 2011 · Replies 5 · Mar 17, 2011

Replies: 5

Views: 3K

Coliding Galaxies: A Highly Ordered Event?

Mar 16, 2011 · Replies 5 · Mar 16, 2011

Replies: 5

Views: 3K

Discover Gliese 581g - Just 20 Light-Years Away!

Sep 29, 2010 · Replies 66 · Mar 16, 2011

3

Replies: 66

Views: 18K

What would happen if the Earth become completely solid?

Mar 10, 2011 · Replies 8 · Mar 16, 2011

Replies: 8

Views: 9K

Gravitational Speed: Is Removal & Creation Equal?

Jan 14, 2011 · Replies 2 · Mar 16, 2011

Replies: 2

Views: 3K

Calculating Moon's Total Kinetic Energy

Mar 14, 2011 · Replies 2 · Mar 16, 2011

Replies: 2

Views: 2K

Are Private Companies the Key to the Future of Outer Space Exploration?

Mar 9, 2011 · Replies 21 · Mar 16, 2011

Replies: 21

Views: 4K

Simulating Galactic Evolution in a Game

Mar 14, 2011 · Replies 4 · Mar 16, 2011

Replies: 4

Views: 3K

Movement of spaceships versus spacewalkers

Mar 14, 2011 · Replies 3 · Mar 15, 2011

Replies: 3

Views: 2K

Is a Constant Velocity Dispersion a Solution to the Jeans Equations of Galaxy?

Mar 15, 2011 · Replies 1 · Mar 15, 2011

Replies: 1

Views: 3K

Travel from one spacetime to another?

Mar 15, 2011 · Replies 1 · Mar 15, 2011

Replies: 1

Views: 2K

Japan's Seismic Activity Altered the Earth's Axis

Mar 14, 2011 · Replies 1 · Mar 15, 2011

Replies: 1

Views: 4K

Did the Sun Go Dark Last Night?

Mar 13, 2011 · Replies 13 · Mar 14, 2011

Replies: 13

Views: 6K

Requirements for Light Speed Travel (as we understand now)

Mar 14, 2011 · Replies 6 · Mar 14, 2011

Replies: 6

Views: 4K

What happens to mass when it approaches the speed of light?

Mar 6, 2011 · Replies 11 · Mar 14, 2011

Replies: 11

Views: 4K

A manned mission to Mars and its obstacles

Mar 12, 2011 · Replies 5 · Mar 14, 2011

Replies: 5

Views: 9K

Does the Event Horizon of a Black Hole Only Form on the Equitorial Plane?

Mar 6, 2011 · Replies 10 · Mar 14, 2011

Replies: 10

Views: 5K

Red Giant: The Death of a Star & Its Expansion

Mar 8, 2011 · Replies 22 · Mar 14, 2011

Replies: 22

Views: 6K

How does the 'atmosphere' of the sun affect ligth from stars passing behind it.

Dec 21, 2008 · Replies 23 · Mar 13, 2011

Replies: 23

Views: 9K

Position of stellar bodies in space.

Mar 12, 2011 · Replies 5 · Mar 13, 2011

Replies: 5

Views: 3K

Summer Solstice Prediction: Effects of Phase Shift Parameters & Assumptions

Mar 12, 2011 · Replies 1 · Mar 12, 2011

Replies: 1

Views: 3K

The eccentricity of binary stars' orbits

Feb 14, 2011 · Replies 7 · Mar 11, 2011

Replies: 7

Views: 8K

Total radiation flux from a star

Mar 7, 2011 · Replies 4 · Mar 11, 2011

Replies: 4

Views: 4K

Do Wormholes Exist in Our Universe or Just in Apples?

Mar 9, 2011 · Replies 12 · Mar 11, 2011

Replies: 12

Views: 4K

What Happens Inside a Black Hole Beyond the Event Horizon?

May 23, 2008 · Replies 16 · Mar 9, 2011

Replies: 16

Views: 7K

Last chance to see Discovery in orbit

Mar 8, 2011 · Replies 3 · Mar 9, 2011

Replies: 3

Views: 2K

Gravitational Force: Why is Normal to Path of Satellites, Planets?

Mar 8, 2011 · Replies 2 · Mar 9, 2011

Replies: 2

Views: 2K

What Are the Mysteries of Black Holes and Their Impact on Time and Motion?

Mar 6, 2011 · Replies 16 · Mar 8, 2011

Replies: 16

Views: 5K

How do you explain the CMB anisotropy diagram?

Mar 8, 2011 · Replies 1 · Mar 8, 2011

Replies: 1

Views: 2K

Exploring Long-Range Coulomb Interactions in Space

Mar 8, 2011 · Replies 3 · Mar 8, 2011

Replies: 3

Views: 4K

Book about Measurements in Astronomy and Cosmology

Mar 7, 2011 · Replies 1 · Mar 7, 2011

Replies: 1

Views: 2K

Earth's position relative to the Sun.

Mar 6, 2011 · Replies 4 · Mar 7, 2011

Replies: 4

Views: 9K

Substellar temperatures comparable to that of the Earth

Mar 7, 2011 · Replies 1 · Mar 7, 2011

Replies: 1

Views: 2K

Source of energy for white dwarf and neutron star

Feb 25, 2011 · Replies 9 · Mar 6, 2011

Replies: 9

Views: 8K

What Are the Individual Libration Percentages of the Moon?

Mar 4, 2011 · Replies 3 · Mar 6, 2011

Replies: 3

Views: 2K

Has Dark matter really been proven?

Feb 21, 2011 · Replies 20 · Mar 6, 2011

Replies: 20

Views: 9K

Why are solar systems or galaxies flat?

Feb 7, 2011 · Replies 9 · Mar 6, 2011

Replies: 9

Views: 13K

Where Do Black Holes Go After They Form?

Dec 12, 2010 · Replies 22 · Mar 6, 2011

Replies: 22

Views: 6K

Understanding the Rotation of Stars: Origins and Processes

Feb 23, 2011 · Replies 9 · Mar 6, 2011

Replies: 9

Views: 3K

Is the Matter in a Black Hole's Accretion Disc Entering the BH or Circling It?

Mar 4, 2011 · Replies 7 · Mar 4, 2011

Replies: 7

Views: 4K

Do Magnetic Fields Around Black Holes Overpower Gravitational Pull?

Mar 3, 2011 · Replies 7 · Mar 4, 2011

Replies: 7

Views: 3K

Heliocentric and baryocentric corrections.

Mar 4, 2011 · Replies 1 · Mar 4, 2011

Replies: 1

Views: 6K

The Frost Line of the Solar System

Feb 25, 2011 · Replies 10 · Mar 4, 2011

Replies: 10

Views: 21K

Calculating star's radius and temperature.

Mar 1, 2011 · Replies 11 · Mar 4, 2011

Replies: 11

Views: 11K

What is superfluidity in neutron stars explained with crayons?

Feb 25, 2011 · Replies 3 · Mar 4, 2011

Replies: 3

Views: 6K

Understanding the Principle of 'Skipping' Off the Atmosphere

Feb 26, 2011 · Replies 4 · Mar 4, 2011

Replies: 4

Views: 12K

Red shift and narrowband filters

Mar 3, 2011 · Replies 3 · Mar 4, 2011

Replies: 3

Views: 3K

What are these lines? (Picture included)

Feb 24, 2011 · Replies 5 · Mar 3, 2011

Replies: 5

Views: 7K

How Can Light Be Influenced by Gravity?

Feb 27, 2011 · Replies 7 · Mar 3, 2011

Replies: 7

Views: 3K

Difference between 'Optical Spectral Type' and 'IR Spectral Type'?

Feb 25, 2011 · Replies 1 · Mar 2, 2011

Replies: 1

Views: 3K

Navigation through the Asteroid belt

Feb 15, 2011 · Replies 4 · Mar 2, 2011

Replies: 4

Views: 5K

Radiation condensing into matter?

Jul 13, 2005 · Replies 9 · Mar 2, 2011

Replies: 9

Views: 6K

Could stronger gravity replace dark matter?

Jan 24, 2011 · Replies 12 · Mar 2, 2011

Replies: 12

Views: 4K

How Does Dark Matter Influence the Spin of Galaxies Compared to Solar Systems?

Feb 28, 2011 · Replies 5 · Mar 1, 2011

Replies: 5

Views: 3K

Earth's Path: Why Ellipse? - How Come, Why Not Circular Motion?

Mar 1, 2011 · Replies 6 · Mar 1, 2011

Replies: 6

Views: 4K

What is the time of perihelion for different planets?

Feb 27, 2011 · Replies 1 · Mar 1, 2011

Replies: 1

Views: 3K

Stargazing When was the first telescope used to view the stars?

Feb 28, 2011 · Replies 4 · Feb 28, 2011

Replies: 4

Views: 4K

Celestial Mass Accretion Spectrum

Feb 27, 2011 · Replies 1 · Feb 28, 2011

Replies: 1

Views: 2K

MOND paper says Bullet Cluster poses problems for Lambda-CDM

Feb 28, 2011 · Replies 2 · Feb 28, 2011

Replies: 2

Views: 3K

Is there a perfect vacuum between atoms in space?

Jul 28, 2010 · Replies 55 · Feb 28, 2011

2

Replies: 55

Views: 17K

Why Do M-Type Stars Exhibit More Diverse Spectral Lines Than O-Type Stars?

Feb 27, 2011 · Replies 2 · Feb 28, 2011

Replies: 2

Views: 3K

Question about atmospheric pressure

Feb 21, 2011 · Replies 7 · Feb 28, 2011

Replies: 7

Views: 7K

What's the easiest way to move a star?

Feb 3, 2011 · Replies 12 · Feb 27, 2011

Replies: 12

Views: 6K

What Causes the Lines in the Spectrum of a Star?

Feb 26, 2011 · Replies 7 · Feb 27, 2011

Replies: 7

Views: 4K

Line of sight and star density question.

Feb 24, 2011 · Replies 3 · Feb 27, 2011

Replies: 3

Views: 4K

Sign convention of bolometric correction

Feb 26, 2011 · Replies 3 · Feb 26, 2011

Replies: 3

Views: 4K

Is Gravity Faster Than Light in Black Holes?

Jul 17, 2009 · Replies 9 · Feb 26, 2011

Replies: 9

Views: 4K

Earth's Spin & Moon: Impact on Rotation

Feb 26, 2011 · Replies 1 · Feb 26, 2011

Replies: 1

Views: 3K

Type Ia Supernovae: Fusion Explosion Explained

Feb 15, 2011 · Replies 33 · Feb 25, 2011

2

Replies: 33

Views: 8K

Difference between theoretical astrophysics and theoretical physics

Feb 24, 2011 · Replies 1 · Feb 24, 2011

Replies: 1

Views: 7K

Gravitational component of light and neutrinos in the universe

Feb 22, 2011 · Replies 3 · Feb 24, 2011

Replies: 3

Views: 3K

Where is Taurus in Relation to the Sun's Orbit in the Milky Way?

Feb 18, 2011 · Replies 4 · Feb 23, 2011

Replies: 4

Views: 7K

What are the shapes of orbits that exist in our solar system

Feb 17, 2011 · Replies 9 · Feb 23, 2011

Replies: 9

Views: 7K

Understanding Quasars & Blazars: Definition & Theory

Feb 21, 2011 · Replies 2 · Feb 23, 2011

Replies: 2

Views: 4K

Why is dark matter distributed in a web rather than falling into clumps ?

Feb 19, 2011 · Replies 9 · Feb 23, 2011

Replies: 9

Views: 4K

Artistic or Computer Generated Astronomy Images?

Feb 22, 2011 · Replies 4 · Feb 22, 2011

Replies: 4

Views: 2K

How Do You Calculate Acceleration and Distance of a Free-Falling Object?

Feb 22, 2011 · Replies 4 · Feb 22, 2011

Replies: 4

Views: 3K

Calculating Acceleration of Stellar Engines: A Comparison to Wikipedia Example

Feb 19, 2011 · Replies 5 · Feb 21, 2011

Replies: 5

Views: 3K

Is Every Point in the Universe the Center?

Feb 6, 2011 · Replies 47 · Feb 21, 2011

2

Replies: 47

Views: 9K

Shouldn’t ice on comets burn up quickly?

Sep 20, 2007 · Replies 11 · Feb 21, 2011

Replies: 11

Views: 14K

How Can We Observe the Oldest and Most Distant Object in the Universe?

Feb 5, 2011 · Replies 12 · Feb 21, 2011

Replies: 12

Views: 5K

Evidence of inexistence in black holes?

Jan 28, 2011 · Replies 9 · Feb 21, 2011

Replies: 9

Views: 4K

Trying to wrap my brain around gravitational assists

Feb 17, 2011 · Replies 7 · Feb 21, 2011

Replies: 7

Views: 3K

Is 0.026 the Key to Unveiling a New Exoplanet's Characteristics?

Feb 21, 2011 · Replies 3 · Feb 21, 2011

Replies: 3

Views: 7K

Are Orbits of Close Binary Stars Truly Circular?

Feb 20, 2011 · Replies 4 · Feb 21, 2011

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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