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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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Faber-Jackson Relation: Explained | Shounak

Dec 23, 2012 · Replies 4 · Dec 24, 2012

Replies: 4

Views: 3K

So the question is:Do all galaxies contain super massive black holes?

Dec 17, 2012 · Replies 9 · Dec 23, 2012

Replies: 9

Views: 4K

Expansion of the Universe - Closed Universe

Dec 22, 2012 · Replies 2 · Dec 22, 2012

Replies: 2

Views: 4K

Stargazing Is my telescope compatible with my latitude?

Dec 19, 2012 · Replies 15 · Dec 21, 2012

Replies: 15

Views: 6K

Hydrogen Fusion Cycle in Stars: Storage/Transport/Consumption?

Dec 21, 2012 · Replies 5 · Dec 21, 2012

Replies: 5

Views: 3K

Elemental Abundance in Stars - The Curve of Growth

Dec 20, 2012 · Replies 1 · Dec 20, 2012

Replies: 1

Views: 3K

Why Does the Sky Appear Blue? Why Can Stars See Us?

Dec 18, 2012 · Replies 4 · Dec 19, 2012

Replies: 4

Views: 3K

Stargazing How useful are collimation eyepieces?

Dec 17, 2012 · Replies 13 · Dec 19, 2012

Replies: 13

Views: 2K

How to keep the earth in the habitable zone

Dec 16, 2012 · Replies 9 · Dec 18, 2012

Replies: 9

Views: 4K

Ebb and Flow Effects: Impacts on Moon & Earth?

Dec 17, 2012 · Replies 2 · Dec 17, 2012

Replies: 2

Views: 2K

Can Excel accurately calculate planet positions in real-time?

Dec 2, 2012 · Replies 4 · Dec 17, 2012

Replies: 4

Views: 18K

Why are the centers of galaxies so bright?

Dec 15, 2012 · Replies 8 · Dec 16, 2012

Replies: 8

Views: 12K

Why don't we see the Geminids twice a year?

Dec 16, 2012 · Replies 4 · Dec 16, 2012

Replies: 4

Views: 2K

Orbital period - Where does M1+M2 come from?

Dec 8, 2012 · Replies 8 · Dec 16, 2012

Replies: 8

Views: 4K

Conditions necessary to form the first and simplest structures

Dec 6, 2012 · Replies 13 · Dec 16, 2012

Replies: 13

Views: 4K

Formation of accretion disk / frame drag

Dec 16, 2012 · Replies 2 · Dec 16, 2012

Replies: 2

Views: 3K

Does spacetime stand on its own?

Dec 13, 2012 · Replies 2 · Dec 15, 2012

Replies: 2

Views: 1K

Finding an Extrasolar Planet's Radius

Dec 12, 2012 · Replies 2 · Dec 13, 2012

Replies: 2

Views: 3K

Uncertainty of distance measurements for regions between 50-250 pc away

Dec 6, 2012 · Replies 4 · Dec 11, 2012

Replies: 4

Views: 2K

Loop of pumped fluid slowly falling into black hole.

Dec 10, 2012 · Replies 4 · Dec 10, 2012

Replies: 4

Views: 3K

Gravitational force Sun/Sirius > Earth/Sun?

Dec 10, 2012 · Replies 3 · Dec 10, 2012

Replies: 3

Views: 6K

At what point would we discover a black hole headed directly toward us?

Nov 29, 2012 · Replies 18 · Dec 10, 2012

Replies: 18

Views: 5K

Solar System's orbit around galaxy, a concise 3D description?

Dec 3, 2012 · Replies 8 · Dec 9, 2012

Replies: 8

Views: 7K

Surface brightness to luminosity

Dec 8, 2012 · Replies 1 · Dec 9, 2012

Replies: 1

Views: 5K

How Do We Measure Star Formation?

Dec 6, 2012 · Replies 9 · Dec 8, 2012

Replies: 9

Views: 4K

Density of supermassive black holes.

Mar 21, 2011 · Replies 12 · Dec 8, 2012

Replies: 12

Views: 13K

How can I calculate the visual magnitude of a star with only its flux data?

Dec 6, 2012 · Replies 3 · Dec 7, 2012

Replies: 3

Views: 6K

Neutron star: smoothest surface in the universe?

Oct 25, 2012 · Replies 29 · Dec 6, 2012

Replies: 29

Views: 15K

Stars of Constellations exist in what Spiral Arm of the Milky Way Galaxy?

Nov 26, 2012 · Replies 19 · Dec 6, 2012

Replies: 19

Views: 7K

What math does one need to know prior to learning Astrophysics

Dec 6, 2012 · Replies 2 · Dec 6, 2012

Replies: 2

Views: 3K

Eye of the storm at Saturn's north pole

Dec 5, 2012 · Replies 3 · Dec 5, 2012

Replies: 3

Views: 3K

Visual respresentations of topics in Astronomy

Dec 3, 2012 · Replies 9 · Dec 4, 2012

Replies: 9

Views: 4K

Can Quasars Really Emit Beyond Their Eddington Limit?

Nov 28, 2012 · Replies 3 · Dec 4, 2012

Replies: 3

Views: 2K

Why Hasn't the Moon Crashed into the Earth?

Dec 1, 2012 · Replies 7 · Dec 4, 2012

Replies: 7

Views: 4K

How Are Black Holes Formed?

Dec 4, 2012 · Replies 1 · Dec 4, 2012

Replies: 1

Views: 3K

Could a Planet Thrive with Two Suns?

Nov 26, 2012 · Replies 29 · Dec 4, 2012

Replies: 29

Views: 10K

Could Transient Radio Signals Indicate Extraterrestrial Intelligence?

Dec 3, 2012 · Replies 1 · Dec 3, 2012

Replies: 1

Views: 3K

Is Astrophysics the right course for me?

Dec 1, 2012 · Replies 5 · Dec 3, 2012

Replies: 5

Views: 2K

Game: Who correctly can guess this astronomical object?

Dec 2, 2012 · Replies 6 · Dec 3, 2012

Replies: 6

Views: 3K

Stargazing Orion SpaceProbe 130 EQ question

Nov 26, 2012 · Replies 24 · Dec 3, 2012

Replies: 24

Views: 3K

Force needed to move a free floating object through space

Dec 2, 2012 · Replies 7 · Dec 2, 2012

Replies: 7

Views: 13K

Are Brown Dwarfs Part of the Main Sequence on the H-R Diagram?

Dec 2, 2012 · Replies 5 · Dec 2, 2012

Replies: 5

Views: 7K

Big Bang Theory: Force & Surface Questions

Dec 2, 2012 · Replies 1 · Dec 2, 2012

Replies: 1

Views: 3K

Ice on Mercury in polar crater shade

Nov 29, 2012 · Replies 4 · Dec 2, 2012

Replies: 4

Views: 3K

Why Can We See the Corona Sphere During a Solar Eclipse?

Dec 1, 2012 · Replies 2 · Dec 2, 2012

Replies: 2

Views: 4K

Is the Universe really infinite/absolute 0

Dec 1, 2012 · Replies 2 · Dec 1, 2012

Replies: 2

Views: 3K

Flux Density (Jy) to Luminosity when wavelength is involved

Nov 30, 2012 · Replies 5 · Dec 1, 2012

Replies: 5

Views: 6K

'Over-massive galactic black hole discovered

Nov 30, 2012 · Replies 1 · Nov 30, 2012

Replies: 1

Views: 3K

Planets & Relativity: Time Dilation in Our Galaxy

Nov 29, 2012 · Replies 2 · Nov 30, 2012

Replies: 2

Views: 3K

Effects of perpendicularly-approaching asteroid on Earth

Nov 22, 2012 · Replies 8 · Nov 29, 2012

Replies: 8

Views: 4K

Curiosity Rover makes Earth shattering discovery

Nov 20, 2012 · Replies 20 · Nov 29, 2012

Replies: 20

Views: 10K

Solar wobble - what are the effects of Jupiter and Saturn?

Nov 29, 2012 · Replies 1 · Nov 29, 2012

Replies: 1

Views: 3K

Population III Stars Metallicity

Nov 28, 2012 · Replies 5 · Nov 29, 2012

Replies: 5

Views: 3K

Omega effect: turning poloidal magnetic field into toroidal field

Nov 26, 2012 · Replies 7 · Nov 28, 2012

Replies: 7

Views: 5K

Any difference on Satellite location between W135 and W075?

Nov 27, 2012 · Replies 7 · Nov 28, 2012

Replies: 7

Views: 3K

Cosmology - given omega_m and a static universe, find the range of values of q_0

Nov 21, 2012 · Replies 1 · Nov 28, 2012

Replies: 1

Views: 2K

Classic Papers in Astronomy and Cosmology

Aug 25, 2005 · Replies 17 · Nov 28, 2012

Replies: 17

Views: 55K

How can a star in the Milkyway be nearly as old as the universe?

Nov 26, 2012 · Replies 11 · Nov 27, 2012

Replies: 11

Views: 4K

Calculations for sun position follower

Nov 20, 2012 · Replies 2 · Nov 27, 2012

Replies: 2

Views: 4K

Black hole accretion: angular momentum loss

Nov 27, 2012 · Replies 7 · Nov 27, 2012

Replies: 7

Views: 4K

What do broad and strong emission lines mean and what are the main types of AGN?

Nov 26, 2012 · Replies 3 · Nov 27, 2012

Replies: 3

Views: 3K

Redshift of spinning star surface as seen on axis

Nov 24, 2012 · Replies 6 · Nov 27, 2012

Replies: 6

Views: 3K

White Dwarfs,Black Dwarfs & neutron star

Jan 7, 2011 · Replies 10 · Nov 27, 2012

Replies: 10

Views: 7K

How orbiting bodies arrange themselves in orbital resonance?

Nov 23, 2012 · Replies 6 · Nov 26, 2012

Replies: 6

Views: 3K

Is the universe expanding or it is circuiting?

Nov 24, 2012 · Replies 9 · Nov 26, 2012

Replies: 9

Views: 3K

Black Hole Radiation: Stephen Hawking's Theory Explained

Nov 25, 2012 · Replies 1 · Nov 25, 2012

Replies: 1

Views: 2K

Please, help with observation plan

Nov 15, 2012 · Replies 18 · Nov 23, 2012

Replies: 18

Views: 4K

What is different in Solar Radio vs Radio Flux 10.7 cm?

Nov 22, 2012 · Replies 3 · Nov 23, 2012

Replies: 3

Views: 4K

Is there some liquid planets out there?

Nov 22, 2012 · Replies 4 · Nov 23, 2012

Replies: 4

Views: 3K

Active Galaxies and the Unified Model

Nov 22, 2012 · Replies 4 · Nov 22, 2012

Replies: 4

Views: 2K

Classsification of Pre main sequence(PMS) stars

Nov 20, 2012 · Replies 4 · Nov 22, 2012

Replies: 4

Views: 3K

Discovering the True Speed of Light: A Question on Its Absolute Nature

Nov 5, 2012 · Replies 5 · Nov 21, 2012

Replies: 5

Views: 3K

Where can I find a downloadable database of stars?

Nov 19, 2012 · Replies 11 · Nov 21, 2012

Replies: 11

Views: 4K

What Existed Before the Big Bang?

Oct 5, 2012 · Replies 22 · Nov 20, 2012

Replies: 22

Views: 8K

Confusion about redshift in a universe with accelerating expansion

Nov 20, 2012 · Replies 8 · Nov 20, 2012

Replies: 8

Views: 4K

Is light pollution causing wasted energy and costing billions of dollars?

Nov 19, 2012 · Replies 4 · Nov 20, 2012

Replies: 4

Views: 4K

Deuterons used up before reaching the A=5 and 8 bottlenecks?

Nov 16, 2012 · Replies 6 · Nov 19, 2012

Replies: 6

Views: 2K

General question, where can I learn about all the constellations and

Nov 18, 2012 · Replies 3 · Nov 18, 2012

Replies: 3

Views: 2K

Stargazing Telescope Resolving Power Limits

Nov 11, 2012 · Replies 23 · Nov 18, 2012

Replies: 23

Views: 6K

Does Photon Emission Influence Celestial Body Movement?

Nov 11, 2012 · Replies 29 · Nov 18, 2012

Replies: 29

Views: 8K

New hab-zone planet HD40307g distance 42 ly, estim 7 earthmass

Nov 9, 2012 · Replies 2 · Nov 17, 2012

Replies: 2

Views: 4K

Is There a 100 Solar Mass Black Hole in Orion Nebula?

Nov 14, 2012 · Replies 17 · Nov 17, 2012

Replies: 17

Views: 4K

What is the nature of matter and its relation to eternity?

Nov 16, 2012 · Replies 5 · Nov 17, 2012

Replies: 5

Views: 10K

Help understanding solar imaging wavelength and coronal temp

Nov 14, 2012 · Replies 1 · Nov 17, 2012

Replies: 1

Views: 3K

Z ~ 11 galaxy observed by CLASH most distant as of Nov 2012

Nov 16, 2012 · Replies 8 · Nov 17, 2012

Replies: 8

Views: 3K

Is Space Considered a Medium for Photons and Other Waves?

Nov 14, 2012 · Replies 31 · Nov 17, 2012

2

Replies: 31

Views: 9K

What is the Definition of Space in Physics?

Nov 17, 2012 · Replies 1 · Nov 17, 2012

Replies: 1

Views: 2K

Method for spaceship to be absolutely still in space

Jul 2, 2012 · Replies 12 · Nov 16, 2012

Replies: 12

Views: 6K

Orphan planets, i.e., planets not in a solar system

Nov 14, 2012 · Replies 9 · Nov 16, 2012

Replies: 9

Views: 4K

Is a Webcam Better than a DSLR for Astrophotography?

Nov 13, 2012 · Replies 32 · Nov 16, 2012

2

Replies: 32

Views: 11K

Searching for Colliding Stars: Has the Phenomena Ever Been Observed?

Nov 4, 2012 · Replies 8 · Nov 16, 2012

Replies: 8

Views: 3K

Adjective term of pertaining to a non-Earth moon

Oct 31, 2012 · Replies 15 · Nov 16, 2012

Replies: 15

Views: 5K

Is spacetime not the same as space and time ?

Nov 11, 2012 · Replies 4 · Nov 15, 2012

Replies: 4

Views: 2K

If doppler shift can be caused by gravity

Nov 15, 2012 · Replies 8 · Nov 15, 2012

Replies: 8

Views: 4K

Is the Universe Truly Infinite and Ever-Expanding?

Nov 28, 2005 · Replies 87 · Nov 15, 2012

3

Replies: 87

Views: 25K

Will Earth pass through the galactic plane in 2012?

Oct 24, 2012 · Replies 4 · Nov 15, 2012

Replies: 4

Views: 7K

Since the Sun is losing mass, can a planet's orbit change be measured?

Nov 14, 2012 · Replies 2 · Nov 15, 2012

Replies: 2

Views: 3K

Understanding Jeans Instability & Masses

Nov 3, 2012 · Replies 1 · Nov 14, 2012

Replies: 1

Views: 3K

Need Help Understanding Angular Resolution

Nov 7, 2012 · Replies 2 · Nov 13, 2012

Replies: 2

Views: 11K

Longitude of the Ascending nodes (calculation, wrong data perhaps?)

Nov 12, 2012 · Replies 9 · Nov 13, 2012

Replies: 9

Views: 9K

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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