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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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Interacting Universes: Dark Matter & Gravity

Feb 25, 2018 · Replies 2 · Feb 25, 2018

Replies: 2

Views: 2K

I Supernova - the Birth of One is Spotted

Feb 21, 2018 · Replies 3 · Feb 24, 2018

Replies: 3

Views: 2K

I Will NASA Reveal Oxygen in TRAPPIST-1 Exoplanet Atmospheres?

Feb 20, 2017 · Replies 67 · Feb 23, 2018

3

Replies: 67

Views: 14K

A Calculating the Altitude of a Nominal Burst

Feb 19, 2018 · Replies 8 · Feb 22, 2018

Replies: 8

Views: 3K

I Can Dark Energy Cause Deviations in Extremely Large Black Holes?

Feb 21, 2018 · Replies 3 · Feb 22, 2018

Replies: 3

Views: 2K

B How do we measure the Spectral Energy Distribution of quasars?

Feb 21, 2018 · Replies 5 · Feb 21, 2018

Replies: 5

Views: 2K

B Conflicting thought on quasars and black holes

Feb 1, 2018 · Replies 6 · Feb 19, 2018

Replies: 6

Views: 3K

Stargazing Where to buy telescope that measures spectrum?

Feb 19, 2018 · Replies 3 · Feb 19, 2018

Replies: 3

Views: 2K

Stargazing How do you make polar alignment easier for stargazing photography?

Feb 15, 2018 · Replies 7 · Feb 19, 2018

Replies: 7

Views: 2K

I How bright will Musk's Tesla car be in the sky?

Feb 6, 2018 · Replies 14 · Feb 18, 2018

Replies: 14

Views: 4K

B Maximum weight of a Neutron star

Jan 18, 2018 · Replies 5 · Feb 18, 2018

Replies: 5

Views: 2K

A Galaxy mass distribution without DM

Jul 15, 2016 · Replies 9 · Feb 17, 2018

Replies: 9

Views: 3K

Virial thereom as applied to clusters of galaxies

Feb 12, 2018 · Replies 2 · Feb 16, 2018

Replies: 2

Views: 2K

What it takes to start a space exploration company?

Feb 15, 2018 · Replies 2 · Feb 15, 2018

Replies: 2

Views: 2K

Stargazing Solar Eclipse on Feb 15, 2018 | Time and Date

Feb 14, 2018 · Replies 6 · Feb 14, 2018

Replies: 6

Views: 2K

I Changing the ISS's orbital inclination to match the Moon

Feb 12, 2018 · Replies 4 · Feb 12, 2018

Replies: 4

Views: 3K

I Optimizing Lunar Power: North vs. South Poles for Mining and Moonbase Sites

Jan 11, 2018 · Replies 33 · Feb 12, 2018

2

Replies: 33

Views: 4K

I What is the New White Dwarf Mass Limit?

Feb 11, 2018 · Replies 9 · Feb 11, 2018

Replies: 9

Views: 2K

B Could we launch spaceships from a long horizontal ramp?

Feb 10, 2018 · Replies 2 · Feb 11, 2018

Replies: 2

Views: 2K

B Adding a huge electric charge to a black hole?

Apr 12, 2017 · Replies 42 · Feb 10, 2018

2

Replies: 42

Views: 7K

B Scattering of light in a strange fashion

Feb 9, 2018 · Replies 2 · Feb 9, 2018

Replies: 2

Views: 2K

I Detecting Protostars: Light Processing Explained

Feb 4, 2018 · Replies 6 · Feb 6, 2018

Replies: 6

Views: 2K

B Light spectrum of planet Earth as seen from space

Feb 5, 2018 · Replies 3 · Feb 5, 2018

Replies: 3

Views: 2K

I Extragalactic Planets Observed Using Microlensing

Feb 5, 2018 · Replies 3 · Feb 5, 2018

Replies: 3

Views: 2K

I Orbit simulations, tidal forces and planetary oblateness

Feb 2, 2018 · Replies 10 · Feb 4, 2018

Replies: 10

Views: 3K

I What Are the Best Academic Journals for Aspiring Planetary Scientists?

Jan 21, 2018 · Replies 5 · Feb 3, 2018

Replies: 5

Views: 2K

B Is blue shift as common as red shift?

Jun 25, 2017 · Replies 26 · Feb 3, 2018

Replies: 26

Views: 7K

B If the moon were a light bulb how many watts would it be.

Feb 1, 2018 · Replies 13 · Feb 2, 2018

Replies: 13

Views: 9K

B The Moon's inclination to Earth's equator

Feb 2, 2018 · Replies 3 · Feb 2, 2018

Replies: 3

Views: 2K

B Tonight's full moon and lunar eclipse

Jan 30, 2018 · Replies 11 · Feb 1, 2018

Replies: 11

Views: 3K

B How Can Astronomy Even Occur? (Oort Cloud)

Jan 24, 2018 · Replies 35 · Jan 31, 2018

2

Replies: 35

Views: 5K

B Can Star Wars-like asteroid storms exist?

Jan 31, 2018 · Replies 1 · Jan 31, 2018

Replies: 1

Views: 1K

B Temperature of a black hole....observed from the singularity

Jan 29, 2018 · Replies 13 · Jan 30, 2018

Replies: 13

Views: 4K

B Why does Tc & Teff Differ for Different Types of Stars?

Jan 29, 2018 · Replies 2 · Jan 30, 2018

Replies: 2

Views: 2K

I Star Gravitational Binding Energy Questions

Jan 19, 2018 · Replies 8 · Jan 27, 2018

Replies: 8

Views: 7K

B Why Do We Use Different Pairs of Filters to Determine the Temperature of Stars?

Jan 26, 2018 · Replies 5 · Jan 26, 2018

Replies: 5

Views: 2K

B Temperature based on colour index using Planck's law

Jan 22, 2018 · Replies 4 · Jan 26, 2018

Replies: 4

Views: 2K

B Is the starshade going to be positioned in a fixed location?

Jan 22, 2018 · Replies 7 · Jan 26, 2018

Replies: 7

Views: 2K

I Type Ia supernova involving binary white dwarfs?

Jan 20, 2018 · Replies 8 · Jan 25, 2018

Replies: 8

Views: 2K

Could Dark Matter be H or He? They are pervasive

Jan 20, 2018 · Replies 11 · Jan 25, 2018

Replies: 11

Views: 3K

B Unusual object on video - any explanation?

Jan 23, 2018 · Replies 3 · Jan 24, 2018

Replies: 3

Views: 2K

I Some confusion about Kepler’s formula

Jan 10, 2018 · Replies 11 · Jan 23, 2018

Replies: 11

Views: 2K

B Wonder-inducing ring galaxy image

Jan 22, 2018 · Replies 5 · Jan 23, 2018

Replies: 5

Views: 2K

B I'm a rookie and I have a question about spacetime

Jan 22, 2018 · Replies 7 · Jan 22, 2018

Replies: 7

Views: 2K

B Additional Maths: Essential for Astronomy?

Jan 21, 2018 · Replies 2 · Jan 22, 2018

Replies: 2

Views: 1K

I I use an Olll filter to view emission nebula -- how do they work?

Jan 21, 2018 · Replies 1 · Jan 21, 2018

Replies: 1

Views: 1K

I Moon vs Earth for launch to Mars

Dec 31, 2017 · Replies 98 · Jan 17, 2018

4

Replies: 98

Views: 11K

Should We Develop a Unique Terminology for Alien Lifeforms?

Dec 30, 2017 · Replies 31 · Jan 16, 2018

2

Replies: 31

Views: 4K

B Gravastar vs. Neutron Stars: A New Theory for Black Hole Formation?

Jan 15, 2018 · Replies 4 · Jan 16, 2018

Replies: 4

Views: 2K

A Trouble visualizing and understanding the celestial sphere

Jan 9, 2018 · Replies 7 · Jan 15, 2018

Replies: 7

Views: 3K

I Balmer Series Lines: How Do Hot Stars Contain Hydrogen?

Jan 14, 2018 · Replies 9 · Jan 15, 2018

Replies: 9

Views: 2K

Stargazing Is the INTEY Ultra-Clear Telescope a Good Choice for Beginner Astronomers?

Jan 10, 2018 · Replies 10 · Jan 13, 2018

Replies: 10

Views: 5K

I Were all these exoplanets a surprise?

Jan 10, 2018 · Replies 6 · Jan 11, 2018

Replies: 6

Views: 2K

A Could vacuum decay fundamentally change our universe?

Dec 12, 2017 · Replies 5 · Jan 11, 2018

Replies: 5

Views: 3K

B Is 'Oumuamua an Alien Spaceship or Just a Cosmic Coincidence?

Dec 13, 2017 · Replies 25 · Jan 11, 2018

Replies: 25

Views: 5K

B How did Jupiter and Saturn disrupt our solar system

Jan 10, 2018 · Replies 6 · Jan 11, 2018

Replies: 6

Views: 2K

B Can we identify the centre of the Universe?

May 1, 2016 · Replies 97 · Jan 10, 2018

4

Replies: 97

Views: 12K

I Can anyone tell me if 2009 MS9 is prograde or retrograde?

Jan 5, 2018 · Replies 3 · Jan 10, 2018

Replies: 3

Views: 1K

I Are Stars Absorbing and Re-Emitting Radiation from Space?

Jan 10, 2018 · Replies 1 · Jan 10, 2018

Replies: 1

Views: 1K

I Detecting Asteroid Collisions: 'Oumuamua & Radio Telescopes

Dec 17, 2017 · Replies 86 · Jan 10, 2018

3

Replies: 86

Views: 11K

I Is Tabby's Star a Binary System or an Alien Megastructure?

May 20, 2017 · Replies 22 · Jan 9, 2018

Replies: 22

Views: 5K

B New Topographic Map of Saturn's Moon Titan Reveals Liquid Flows

Jan 8, 2018 · Replies 7 · Jan 9, 2018

Replies: 7

Views: 1K

Does the event horizon define the true surface of a black hole?

Jan 7, 2018 · Replies 15 · Jan 9, 2018

Replies: 15

Views: 3K

What is the true width of the Milky Way galaxy?

Jan 8, 2018 · Replies 1 · Jan 8, 2018

Replies: 1

Views: 2K

I Update on liquid water on Mars - maybe it is sand?

Nov 23, 2017 · Replies 12 · Jan 8, 2018

Replies: 12

Views: 3K

B History of RA [why is the vernal equinox used?]

Dec 15, 2017 · Replies 5 · Jan 6, 2018

Replies: 5

Views: 2K

Stargazing The League of Extraordinarily BIG Telescopes

Jan 2, 2018 · Replies 8 · Jan 5, 2018

Replies: 8

Views: 3K

B Is a Black Hole Really Waterproof?

Jan 4, 2018 · Replies 2 · Jan 4, 2018

Replies: 2

Views: 1K

The unsolved engineering of the "Space Ladder"

Sep 6, 2017 · Replies 25 · Jan 4, 2018

Replies: 25

Views: 5K

I How Does Einstein's Curvature of Space Affect Celestial Orbits?

Dec 31, 2017 · Replies 2 · Jan 4, 2018

Replies: 2

Views: 2K

I Calculating signal to noise ratio for deimos data

Dec 30, 2017 · Replies 3 · Jan 2, 2018

Replies: 3

Views: 2K

I JPL Ephemeris Files: Calculating Heliocentric Pos. of Mars

Dec 30, 2017 · Replies 1 · Jan 1, 2018

Replies: 1

Views: 2K

Stargazing Astounding Moon Astro Photos: Capturing the Beauty of Our Celestial Neighbor

Dec 31, 2017 · Replies 5 · Dec 31, 2017

Replies: 5

Views: 2K

I Calculating Energy to Remove Space Debris from Earth Orbit

Dec 17, 2017 · Replies 15 · Dec 31, 2017

Replies: 15

Views: 3K

I What Does Redshift and Scale Factor Tell Us About the Size of the Universe?

Dec 31, 2017 · Replies 8 · Dec 31, 2017

Replies: 8

Views: 3K

I What's the effect of solar pole reversal on the Parker Spiral?

Dec 26, 2017 · Replies 3 · Dec 30, 2017

Replies: 3

Views: 2K

B Distance between the Earth and The Moon

Dec 9, 2017 · Replies 10 · Dec 30, 2017

Replies: 10

Views: 4K

B Are Black Holes Actually Giant Neutron Stars Cloaked in an Event Horizon?

Apr 20, 2017 · Replies 70 · Dec 29, 2017

3

Replies: 70

Views: 12K

I Star spectra and star color relation

Dec 28, 2017 · Replies 3 · Dec 28, 2017

Replies: 3

Views: 2K

B What's the deal with dark matter

Nov 9, 2017 · Replies 45 · Dec 28, 2017

2

Replies: 45

Views: 7K

B Can the Solar System's Chaos Lead to Earth's Sudden Demise?

Dec 27, 2017 · Replies 6 · Dec 28, 2017

Replies: 6

Views: 2K

I New Kepler results (8th planet around Kepler-90)

Dec 9, 2017 · Replies 29 · Dec 27, 2017

Replies: 29

Views: 6K

I Low mass limit of a neutron star

Dec 1, 2017 · Replies 26 · Dec 26, 2017

Replies: 26

Views: 4K

Stargazing Programable telescope that will point to any spot on Earth?

Dec 23, 2017 · Replies 11 · Dec 24, 2017

Replies: 11

Views: 2K

I Are there galaxies with 2 cores?

Dec 11, 2017 · Replies 9 · Dec 22, 2017

Replies: 9

Views: 2K

Stargazing Is it nebulosity or an artefact?

Dec 12, 2017 · Replies 28 · Dec 18, 2017

Replies: 28

Views: 4K

B How do astronomers find the "parallax angle" of a star?

Nov 30, 2017 · Replies 25 · Dec 17, 2017

Replies: 25

Views: 5K

Stargazing For those aurora chasers -- a heads up

Aug 27, 2017 · Replies 52 · Dec 16, 2017

2

Replies: 52

Views: 9K

Working with Keplerian Elements & Deriving Vernal Equinox

Jun 7, 2010 · Replies 1 · Dec 15, 2017

Replies: 1

Views: 4K

I Transit Photometry: Questions about Detecting Exoplanets

Dec 10, 2017 · Replies 5 · Dec 14, 2017

Replies: 5

Views: 2K

B Unitarity and Entanglement: Examining the Fate of Information in Black Holes

Dec 21, 2016 · Replies 27 · Dec 14, 2017

Replies: 27

Views: 5K

I How long would it take for gas to leak out of a space box?

Dec 10, 2017 · Replies 19 · Dec 14, 2017

Replies: 19

Views: 2K

How to calculate ambient temperature in space or in orbit?

Dec 13, 2017 · Replies 18 · Dec 13, 2017

Replies: 18

Views: 5K

I Quasar Number Densities and Lifetimes

Dec 12, 2017 · Replies 1 · Dec 12, 2017

Replies: 1

Views: 1K

B Optical eyepieces for star observations

Nov 14, 2017 · Replies 17 · Dec 11, 2017

Replies: 17

Views: 2K

I Why Hasn't Mars Ice Core Samples Research Been Attempted?

Apr 13, 2016 · Replies 5 · Dec 11, 2017

Replies: 5

Views: 3K

I Why is neutron star interesting to physics ?

Dec 8, 2017 · Replies 8 · Dec 11, 2017

Replies: 8

Views: 2K

I What happens if two black holes collide

Nov 27, 2017 · Replies 12 · Dec 11, 2017

Replies: 12

Views: 4K

I Why is the time of formation of this Black Hole in question?

Dec 7, 2017 · Replies 15 · Dec 10, 2017

Replies: 15

Views: 2K

I Fly-by anomaly is back with Juno

Dec 10, 2017 · Replies 1 · Dec 10, 2017

Replies: 1

Views: 2K

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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