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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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B Cloud Cities on Venus: Viability & Feasibility

Jul 12, 2019 · Replies 14 · Jul 18, 2019

Replies: 14

Views: 3K

I Fraction of solar systems with an Earth-moon configuration?

Jul 15, 2019 · Replies 8 · Jul 18, 2019

Replies: 8

Views: 2K

I New table-top gravitational-wave detector proposed

Jul 17, 2019 · Replies 2 · Jul 18, 2019

Replies: 2

Views: 2K

B Thirty Meter Telescope can resume construction

Jul 12, 2019 · Replies 2 · Jul 13, 2019

Replies: 2

Views: 2K

Is the Solar Constant Really 340 W/m^2 or 680 W/m^2?

Jul 8, 2019 · Replies 6 · Jul 9, 2019

Replies: 6

Views: 3K

I Can Satellites in Frozen Orbits of the Moon Study Different Ground Areas?

Jul 2, 2019 · Replies 14 · Jul 8, 2019

Replies: 14

Views: 4K

I What is the geometric plan for ALMA?

Jun 22, 2019 · Replies 19 · Jul 7, 2019

Replies: 19

Views: 3K

I Can the LIGO observatories detect (with accuracy) temblors?

Jul 6, 2019 · Replies 2 · Jul 7, 2019

Replies: 2

Views: 1K

I The laws of thermodynamics and the Universe

Jun 25, 2019 · Replies 16 · Jul 3, 2019

Replies: 16

Views: 4K

B How Is Methane Disappearing from Mars' Atmosphere?

Apr 11, 2019 · Replies 17 · Jul 2, 2019

Replies: 17

Views: 5K

B What is responsible for the spinning of a galaxy?

Jul 2, 2019 · Replies 5 · Jul 2, 2019

Replies: 5

Views: 2K

I How can an asteroid get caught at a Lagrange point without a "brake"?

Jun 25, 2019 · Replies 44 · Jul 1, 2019

2

Replies: 44

Views: 8K

B Why do pictures of stars have 4 cardinal points?

Apr 3, 2019 · Replies 33 · Jun 30, 2019

2

Replies: 33

Views: 7K

B Do planets without a solid surface precess?

Jun 29, 2019 · Replies 4 · Jun 30, 2019

Replies: 4

Views: 2K

Determine whether A is orbiting B

Mar 7, 2010 · Replies 2 · Jun 29, 2019

Replies: 2

Views: 2K

Stargazing Event Horizon Telescope Results Released Yesterday (April 10, 2019)

Apr 1, 2019 · Replies 129 · Jun 29, 2019

5

Replies: 129

Views: 19K

B What process allows us to 'see' lightyears of distance with the natural eye?

Apr 18, 2019 · Replies 53 · Jun 27, 2019

2

Replies: 53

Views: 7K

I Does the gravity sling require rocket guidance to be non-negligible?

Jun 26, 2019 · Replies 5 · Jun 26, 2019

Replies: 5

Views: 1K

How was the Earth's Orbit Derived?

Feb 5, 2010 · Replies 1 · Jun 25, 2019

Replies: 1

Views: 3K

How Does Rotational Velocity Affect Gravity and Space Launches?

Mar 6, 2007 · Replies 1 · Jun 25, 2019

Replies: 1

Views: 5K

SpaceX's 5K Satellites: A Risk of Man-Made Meteors?

Jun 23, 2019 · Replies 2 · Jun 24, 2019

Replies: 2

Views: 2K

My 3rd question - About Stellar Spectrum

Nov 10, 2004 · Replies 2 · Jun 24, 2019

Replies: 2

Views: 4K

B What’s more “important": GR or QM?

Jun 15, 2019 · Replies 7 · Jun 23, 2019

Replies: 7

Views: 2K

Stargazing Does Our Picture of the Universe Become Less Accurate the Farther We Look?

Apr 14, 2016 · Replies 4 · Jun 22, 2019

Replies: 4

Views: 3K

B Defining Planets: The Case of Pluto and Other Small Bodies

May 21, 2019 · Replies 27 · Jun 21, 2019

Replies: 27

Views: 6K

I BREAKING: New potentially habitable exoplanet found around Teegarden

Jun 18, 2019 · Replies 1 · Jun 18, 2019

Replies: 1

Views: 2K

B How well should Astronomers know General Relativity?

Jun 15, 2019 · Replies 1 · Jun 15, 2019

Replies: 1

Views: 2K

What is Hubble's Luminosity Law?

Jun 13, 2019 · Replies 2 · Jun 14, 2019

Replies: 2

Views: 2K

A 2-body inspirals that circularize

Jun 10, 2019 · Replies 2 · Jun 12, 2019

Replies: 2

Views: 2K

I What's the largest rocky planet with 1g gravity in theory?

Mar 22, 2019 · Replies 15 · Jun 11, 2019

Replies: 15

Views: 4K

B The Hubble deep field photos and the edge of the universe

Jun 10, 2019 · Replies 17 · Jun 10, 2019

Replies: 17

Views: 3K

B Black holes and the first law of thermodynamics

May 31, 2019 · Replies 10 · Jun 8, 2019

Replies: 10

Views: 3K

I Most-detailed-ever simulations of a BH solve long standing mystery

Jun 6, 2019 · Replies 5 · Jun 6, 2019

Replies: 5

Views: 2K

B Galaxy Database with distances from Earth

Jun 3, 2019 · Replies 12 · Jun 4, 2019

Replies: 12

Views: 3K

Can anything capture a black hole?

Jan 3, 2010 · Replies 1 · Jun 2, 2019

Replies: 1

Views: 3K

B Is the asteroid belt horizontal or like a dome?

May 29, 2019 · Replies 7 · May 30, 2019

Replies: 7

Views: 3K

B Destroying asteroids shown to be very difficult

Mar 4, 2019 · Replies 50 · May 27, 2019

2

Replies: 50

Views: 8K

I The Sun's excess gamma rays and strange dips

May 20, 2019 · Replies 1 · May 25, 2019

Replies: 1

Views: 2K

Playing with the Universe Sandbox Software

May 20, 2019 · Replies 1 · May 25, 2019

Replies: 1

Views: 2K

What is the shape of the universe?

Apr 30, 2009 · Replies 5 · May 25, 2019

Replies: 5

Views: 4K

B Radio source Hercules A and galaxy 3C 348

May 12, 2019 · Replies 4 · May 23, 2019

Replies: 4

Views: 3K

B New theory, our solar system formation, "space bubble"

Dec 23, 2017 · Replies 16 · May 21, 2019

Replies: 16

Views: 4K

B What is empirically known about the shape and size of the Universe?

May 28, 2016 · Replies 34 · May 21, 2019

2

Replies: 34

Views: 6K

What should we do with the retired Hubble?

Aug 11, 2003 · Replies 18 · May 21, 2019

Replies: 18

Views: 5K

B Juno -- Coolest space ship in the solar system?

May 20, 2019 · Replies 3 · May 20, 2019

Replies: 3

Views: 2K

I Please teach me about the mass of Sgr A*

May 18, 2019 · Replies 13 · May 19, 2019

Replies: 13

Views: 2K

Stargazing How Did Ancient People Calculate Celestial Measurements?

May 17, 2019 · Replies 7 · May 18, 2019

Replies: 7

Views: 2K

B A little logical doubt on Hawking radiation

May 17, 2019 · Replies 3 · May 17, 2019

Replies: 3

Views: 2K

I Terraforming Mars by using Europa

Aug 2, 2017 · Replies 57 · May 16, 2019

2

Replies: 57

Views: 12K

I What physical mechanisms are involved in heating planetary bodies?

May 16, 2019 · Replies 5 · May 16, 2019

Replies: 5

Views: 1K

I Questions about the inverse square law

May 15, 2019 · Replies 3 · May 16, 2019

Replies: 3

Views: 2K

I Mars Magnetosphere: New Research on Solar Wind Induced Shielding

Dec 11, 2017 · Replies 14 · May 16, 2019

Replies: 14

Views: 3K

How best to photograph the Lyrid meteor shower

Apr 13, 2012 · Replies 3 · May 12, 2019

Replies: 3

Views: 3K

Is the Floating Launch Loop a Viable Alternative for Space Exploration?

Dec 3, 2016 · Replies 1 · May 12, 2019

Replies: 1

Views: 2K

Excited to go to Brian Cox's "ADVENTURES IN SPACE & TIME" tonight

May 10, 2019 · Replies 9 · May 11, 2019

Replies: 9

Views: 2K

I Planets or stars that are composed entirely out from Dark Matter.

May 11, 2019 · Replies 4 · May 11, 2019

Replies: 4

Views: 2K

I Cosmic microwave background observations

May 9, 2019 · Replies 3 · May 10, 2019

Replies: 3

Views: 2K

I What happens to spacetime during the expansion of the Universe?

May 8, 2019 · Replies 21 · May 9, 2019

Replies: 21

Views: 3K

I So astronomers really don't have an idea about density of asteroids?

May 8, 2019 · Replies 4 · May 8, 2019

Replies: 4

Views: 2K

Alignment of Quasar Polarizations 0507274

Oct 31, 2005 · Replies 2 · May 7, 2019

Replies: 2

Views: 3K

How Can I Find Correction Factors for Tropical Years in Historical Data?

May 12, 2008 · Replies 2 · May 7, 2019

Replies: 2

Views: 3K

Black hole accretion disk/jet reference

Mar 8, 2013 · Replies 1 · May 7, 2019

Replies: 1

Views: 2K

Lyman alpha forest different for different objects?

Oct 24, 2009 · Replies 1 · May 7, 2019

Replies: 1

Views: 2K

Black Hole Confusion: How Karen Masters Contributed

Nov 13, 2009 · Replies 1 · May 7, 2019

Replies: 1

Views: 2K

Galactic Evolution: Recent Papers Reveal Important Insights

Oct 8, 2005 · Replies 1 · May 7, 2019

Replies: 1

Views: 3K

Escape Velocity in GR - PhysicsForums

Aug 28, 2008 · Replies 1 · May 7, 2019

Replies: 1

Views: 3K

Does the Thermoelectric effect apply in sun?

Feb 7, 2010 · Replies 1 · May 7, 2019

Replies: 1

Views: 3K

Centripetal forces and gravity

Apr 29, 2008 · Replies 1 · May 7, 2019

Replies: 1

Views: 3K

What Caused the Ejection of Mu Columbae and AE Aurigae from Orion?

Dec 27, 2009 · Replies 1 · May 7, 2019

Replies: 1

Views: 3K

Spiral Galaxies: Axes Alignment with Cosmic Voids

Nov 5, 2007 · Replies 1 · May 7, 2019

Replies: 1

Views: 4K

B Wow. Great picture of exoplanet HR8799e - 129Ly distant

Mar 27, 2019 · Replies 10 · May 7, 2019

Replies: 10

Views: 3K

A How does the electromagnetic force influence a galaxy (if at all)?

May 5, 2019 · Replies 5 · May 6, 2019

Replies: 5

Views: 2K

I Some comments on the 2019 Planetary Defense Conference

May 5, 2019 · Replies 1 · May 6, 2019

Replies: 1

Views: 2K

Saturn's hexagon and his accretion disk jets

Apr 5, 2007 · Replies 1 · May 5, 2019

Replies: 1

Views: 4K

I Fitting a SiII curve in a supernova spectra

May 5, 2019 · Replies 1 · May 5, 2019

Replies: 1

Views: 2K

What Causes Meteor Showers and How Can You See Them?

Nov 4, 2011 · Replies 1 · May 4, 2019

Replies: 1

Views: 4K

B Can a Stronger Black Hole Turn a Weaker One into a White Hole?

May 1, 2019 · Replies 14 · May 3, 2019

Replies: 14

Views: 3K

For astronomers, what software/languages do you use to handle data?

May 1, 2019 · Replies 3 · May 3, 2019

Replies: 3

Views: 2K

How does one compute frequency bandwidth based on FWHM

Jan 6, 2017 · Replies 1 · May 2, 2019

Replies: 1

Views: 2K

B What are these bright spots in this zoomable image of the Milky Way?

Feb 1, 2019 · Replies 15 · Apr 30, 2019

Replies: 15

Views: 4K

B How to find inverse steradian from arcmin^-2 for density of galaxy

Apr 29, 2019 · Replies 2 · Apr 29, 2019

Replies: 2

Views: 2K

I What is the Most Accurate Mass for Rigel?

Apr 28, 2019 · Replies 9 · Apr 28, 2019

Replies: 9

Views: 2K

Discovering Sedna: The Mysterious Red Planetoid Orbiting the Sun

Mar 17, 2004 · Replies 1 · Apr 28, 2019

Replies: 1

Views: 6K

B How prevalent is the R language in astronomy research?

Apr 27, 2019 · Replies 1 · Apr 28, 2019

Replies: 1

Views: 2K

I Why are pictures of galaxies so clear?

Apr 20, 2019 · Replies 19 · Apr 28, 2019

Replies: 19

Views: 3K

A Interplanetary electromagnetic field

Apr 27, 2019 · Replies 2 · Apr 27, 2019

Replies: 2

Views: 2K

Dark Matter Halo + Virial theorem Q.

Jul 16, 2008 · Replies 1 · Apr 25, 2019

Replies: 1

Views: 4K

R136a1: The Most Massive and Luminous Blue Hypergiant Star

Jul 25, 2010 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 20K

Typical light levels at Mars's surface

Jul 16, 2008 · Replies 2 · Apr 23, 2019

Replies: 2

Views: 6K

Recent mass estimates for Milky and the Local Group

Oct 21, 2007 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 4K

How Many Stars Can Detectable Wobbles Reveal Extrasolar Planets?

Nov 5, 2012 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 5K

Anti-Matter- Regular Matter- Pulse Collisions?

Nov 2, 2006 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 6K

Black hole singularities and negative space-time

Dec 6, 2008 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 6K

New and Improved: Elliptical Transfer Orbits determination procedure.

Jan 14, 2008 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 6K

Poll

Calculating the Sun's Bending Angle on a Ray of Light

May 17, 2003 · Replies 1 · Apr 23, 2019

Replies: 1

Views: 8K

Stargazing Our absolute speed in the cosmos

Apr 18, 2019 · Replies 7 · Apr 22, 2019

Replies: 7

Views: 3K

Coronal Rain -- an interesting article

Apr 19, 2019 · Replies 3 · Apr 21, 2019

Replies: 3

Views: 2K

I Could a fully convective Sun double its lifespan?

Mar 21, 2019 · Replies 21 · Apr 19, 2019

Replies: 21

Views: 4K

Stargazing Short videos on the Messier catalog of deep sky objects

Apr 19, 2019 · Replies 1 · Apr 19, 2019

Replies: 1

Views: 2K

I Why the Moon always shows the same face

Mar 26, 2019 · Replies 83 · Apr 18, 2019

3

Replies: 83

Views: 10K

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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