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Astronomy, Astrophysics, Cosmology Forum

Join in expert discussion on the topics of Astronomy, astrophysics and cosmology. This may include discussion on celestial objects, space, and the physical universe as a whole. Mainstream science only.

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Undergrad Dark Matter is baryonic matter passed through a black hole?

Apr 28, 2015 · Replies 3 · Apr 28, 2015

Replies: 3

Views: 1K

Graduate Can a Black Hole Form Directly from a Collapsing Protostar Cloud?

Nov 20, 2014 · Replies 19 · Apr 28, 2015

Replies: 19

Views: 3K

Undergrad Globular cluster luminosity function

Apr 22, 2015 · Replies 3 · Apr 28, 2015

Replies: 3

Views: 3K

Graduate Cosmological and doppler redshift

Apr 28, 2015 · Replies 2 · Apr 28, 2015

Replies: 2

Views: 2K

Graduate How Do Gravitational Waves Affect Space-Time?

Apr 25, 2015 · Replies 14 · Apr 28, 2015

Replies: 14

Views: 2K

Graduate Marcus's 'no-pressure' model in different jacket

Apr 26, 2015 · Replies 4 · Apr 28, 2015

Replies: 4

Views: 2K

Why is the Moon going above Jupiter in the sky?

Apr 27, 2015 · Replies 16 · Apr 28, 2015

Replies: 16

Views: 2K

Graduate Is Neutron Star Energy a Disappointment for Nuclear Renewables?

Apr 20, 2014 · Replies 16 · Apr 28, 2015

Replies: 16

Views: 4K

Stargazing Upgrade Your Telescope Today: Top 10-Inch Aperture Options Under £600

Apr 26, 2015 · Replies 3 · Apr 28, 2015

Replies: 3

Views: 2K

M51 Photo: 1 Hour Total Integration @ 800/5.6, ISO 2000

Apr 13, 2015 · Replies 7 · Apr 27, 2015

Replies: 7

Views: 2K

Graduate Life and matter in exotic spatial conditions

Apr 26, 2015 · Replies 1 · Apr 26, 2015

Replies: 1

Views: 1K

Graduate Two moons in tidal lock orbit: phases, tides, axial tilt?

Apr 2, 2015 · Replies 10 · Apr 26, 2015

Replies: 10

Views: 4K

Graduate What Was Space and Time Before the Big Bang?

Apr 26, 2015 · Replies 2 · Apr 26, 2015

Replies: 2

Views: 2K

Graduate Calculating albedo and eccentricity

Apr 24, 2015 · Replies 3 · Apr 25, 2015

Replies: 3

Views: 3K

Undergrad Can Non-Destructive Methods Stop a Giant Asteroid from Hitting Earth?

Apr 24, 2015 · Replies 9 · Apr 25, 2015

Replies: 9

Views: 2K

High School What happens if we launched a shot from a pistol in space?

Apr 25, 2015 · Replies 1 · Apr 25, 2015

Replies: 1

Views: 1K

Graduate Mystery of strange radio bursts from space

Apr 2, 2015 · Replies 63 · Apr 25, 2015

3

Replies: 63

Views: 12K

Graduate How Do We See The Background Radiation?

Apr 24, 2015 · Replies 9 · Apr 25, 2015

Replies: 9

Views: 2K

Undergrad What Happens if a Black Hole Dies or Disappears?

Apr 19, 2015 · Replies 8 · Apr 24, 2015

Replies: 8

Views: 2K

What stars/star systems can I see tonight?

Apr 24, 2015 · Replies 5 · Apr 24, 2015

Replies: 5

Views: 2K

High School Is Oxygen-Based Life Possible in Other Galaxies?

Apr 24, 2015 · Replies 3 · Apr 24, 2015

Replies: 3

Views: 2K

Undergrad Re. Dark matter. Concept of nothing

Apr 24, 2015 · Replies 2 · Apr 24, 2015

Replies: 2

Views: 1K

Graduate Standard candle - in question - affects distance estimates

Apr 11, 2015 · Replies 46 · Apr 24, 2015

2

Replies: 46

Views: 7K

Graduate Flat galaxy rotation curves without dark matter

Apr 23, 2015 · Replies 1 · Apr 23, 2015

Replies: 1

Views: 3K

Undergrad Which is the most powerful black hole or a worm hole and why

Apr 21, 2015 · Replies 4 · Apr 23, 2015

Replies: 4

Views: 2K

Graduate How to check a statement about orbital angles of exoplanets?

Apr 23, 2015 · Replies 2 · Apr 23, 2015

Replies: 2

Views: 2K

Graduate How can BAO and SN constraints be compared for measuring dark energy?

Apr 19, 2015 · Replies 5 · Apr 22, 2015

Replies: 5

Views: 2K

Graduate What is the Purpose of Fitting Supernova Remnant Spectra?

Apr 22, 2015 · Replies 1 · Apr 22, 2015

Replies: 1

Views: 1K

Graduate Can a Single Particle Move in an Empty Universe?

Apr 15, 2015 · Replies 8 · Apr 22, 2015

Replies: 8

Views: 2K

CRAYFIS Initiative: Is it Worth Joining?

Apr 22, 2015 · Replies 1 · Apr 22, 2015

Replies: 1

Views: 1K

Undergrad How scientists have measured universe?

Apr 9, 2015 · Replies 8 · Apr 22, 2015

Replies: 8

Views: 2K

Undergrad Olbers' paradox and infinite number of stars

Mar 29, 2015 · Replies 16 · Apr 22, 2015

Replies: 16

Views: 5K

Graduate Why Does Luminosity Drop Before a Star Becomes a White Dwarf?

Apr 16, 2015 · Replies 17 · Apr 21, 2015

Replies: 17

Views: 3K

Centaurus A Image Through 27.5" Telescope | iTelescope.net

Apr 15, 2015 · Replies 18 · Apr 21, 2015

Replies: 18

Views: 3K

Omega Centauri: Amazing Image from 2-Month Clear Night

Apr 15, 2015 · Replies 2 · Apr 21, 2015

Replies: 2

Views: 2K

NASA pictures of dark matter collisions

Mar 27, 2015 · Replies 66 · Apr 21, 2015

3

Replies: 66

Views: 8K

Graduate Saha equation partition function for Argon?

Apr 19, 2015 · Replies 5 · Apr 21, 2015

Replies: 5

Views: 4K

Undergrad Much ado about (almost) nothing ?

Apr 21, 2015 · Replies 1 · Apr 21, 2015

Replies: 1

Views: 2K

Graduate Which stage of the sun consists neutron star/stars

Apr 21, 2015 · Replies 3 · Apr 21, 2015

Replies: 3

Views: 2K

High School From what dark matter in space consist of?

Apr 21, 2015 · Replies 9 · Apr 21, 2015

Replies: 9

Views: 2K

Astronomy Calendar of Celestial Events

May 2, 2014 · Replies 17 · Apr 21, 2015

Replies: 17

Views: 9K

Graduate Looking for free downloadable articles on primordial He

Apr 15, 2015 · Replies 1 · Apr 21, 2015

Replies: 1

Views: 1K

Graduate Technical stuff about visualizing BH (Hollywood helpers)

Feb 12, 2015 · Replies 3 · Apr 19, 2015

Replies: 3

Views: 2K

Undergrad Origin of the Solar System: Understanding Hydrogen & Heavy Elements

Apr 18, 2015 · Replies 10 · Apr 19, 2015

Replies: 10

Views: 3K

Graduate Can a radius of curvature be calulated from omega-k?

Apr 19, 2015 · Replies 1 · Apr 19, 2015

Replies: 1

Views: 2K

Different understanding of the universe if .

Apr 19, 2015 · Replies 2 · Apr 19, 2015

Replies: 2

Views: 1K

Graduate Scientists observe potential signs of dark matter

Apr 18, 2015 · Replies 7 · Apr 19, 2015

Replies: 7

Views: 2K

Graduate The End of Time: A Dimensionless Universe Explained

Apr 16, 2015 · Replies 9 · Apr 18, 2015

Replies: 9

Views: 3K

Graduate Fitting a model to astronomical data

Apr 18, 2015 · Replies 2 · Apr 18, 2015

Replies: 2

Views: 2K

Graduate CMB: How Was Matter Distributed Before Photon Decoupling?

Apr 17, 2015 · Replies 8 · Apr 18, 2015

Replies: 8

Views: 2K

Undergrad Why Do Astronauts Feel Weightless on Their Journey to the Moon?

Apr 14, 2015 · Replies 20 · Apr 18, 2015

Replies: 20

Views: 7K

Undergrad Self-Contained Models of Big Bang: Explained for Laymen

Apr 17, 2015 · Replies 3 · Apr 17, 2015

Replies: 3

Views: 1K

Graduate Light clocks measure conformal time - detailed argument

Apr 15, 2015 · Replies 12 · Apr 17, 2015

Replies: 12

Views: 2K

Undergrad Where Did the Emptiness for the Big Bang Come From?

Feb 27, 2015 · Replies 34 · Apr 17, 2015

2

Replies: 34

Views: 5K

High School How Does Time Expand? 9th Grade Guide

Apr 22, 2008 · Replies 12 · Apr 17, 2015

Replies: 12

Views: 4K

Graduate Equilibrium at Universe (possible?)

Jan 30, 2015 · Replies 4 · Apr 17, 2015

Replies: 4

Views: 2K

Graduate Explaining Energy in Cosmological Expansion: A Balloon Analogy

Apr 15, 2015 · Replies 6 · Apr 17, 2015

Replies: 6

Views: 3K

Graduate Acceleration of expansion of Universe not that fast?

Apr 12, 2015 · Replies 2 · Apr 17, 2015

Replies: 2

Views: 2K

Undergrad Why do geosynchronous satellites have to orbit above the Equator?

Jun 11, 2013 · Replies 6 · Apr 16, 2015

Replies: 6

Views: 24K

Graduate Early CMB Temperature: What Changed?

Jan 1, 2014 · Replies 19 · Apr 16, 2015

Replies: 19

Views: 4K

What Does Pluto Really Look Like?

Apr 14, 2015 · Replies 3 · Apr 16, 2015

Replies: 3

Views: 2K

Undergrad Is the CMB unique to our galaxy or present in all galaxies?

Apr 16, 2015 · Replies 6 · Apr 16, 2015

Replies: 6

Views: 2K

Undergrad Absolute magnitude and luminosity

Apr 14, 2015 · Replies 2 · Apr 15, 2015

Replies: 2

Views: 3K

Graduate Precession of Mercury and period of rotation

Apr 15, 2015 · Replies 1 · Apr 15, 2015

Replies: 1

Views: 2K

Undergrad Studying Astronomy: Struggling with Cosmology Maths

Apr 14, 2015 · Replies 4 · Apr 15, 2015

Replies: 4

Views: 2K

Graduate Does the Higgs field mean that space has energy?

Apr 15, 2015 · Replies 2 · Apr 15, 2015

Replies: 2

Views: 1K

Graduate What does the abbreviation YP stand for?

Apr 14, 2015 · Replies 4 · Apr 15, 2015

Replies: 4

Views: 3K

Undergrad Why can't we reach to Speed of light at Space?

Mar 4, 2015 · Replies 122 · Apr 15, 2015

5

Replies: 122

Views: 21K

Graduate Dark Matter Particle: Is Axion the Answer?

Apr 12, 2015 · Replies 23 · Apr 15, 2015

Replies: 23

Views: 4K

Graduate Measuring redshift from type 1a supernova

Apr 14, 2015 · Replies 9 · Apr 15, 2015

Replies: 9

Views: 3K

Graduate How do micro black holes maintain their state?

Apr 14, 2015 · Replies 3 · Apr 14, 2015

Replies: 3

Views: 2K

Undergrad Difference in power and absolute magnitude of a star

Apr 14, 2015 · Replies 3 · Apr 14, 2015

Replies: 3

Views: 3K

Graduate Dark energy and type 1a supernovae?

Apr 9, 2015 · Replies 10 · Apr 14, 2015

Replies: 10

Views: 3K

Graduate Is our locally measured time actually conformal time?

Apr 13, 2015 · Replies 6 · Apr 14, 2015

Replies: 6

Views: 2K

Graduate How Are Electron Clouds Affected in Neutron Stars?

Mar 24, 2015 · Replies 18 · Apr 14, 2015

Replies: 18

Views: 3K

Graduate Black Hole Time Dilation And Observation Of Accretion

Mar 28, 2015 · Replies 30 · Apr 14, 2015

2

Replies: 30

Views: 5K

Graduate A slight confusion regarding dark energy & energy conservation

Apr 8, 2015 · Replies 20 · Apr 14, 2015

Replies: 20

Views: 5K

Graduate Are Pop III Stars Finally Detected in I Zw 18?

Apr 13, 2015 · Replies 5 · Apr 13, 2015

Replies: 5

Views: 2K

Graduate Observed Redshift Variation Over TIme

Apr 12, 2015 · Replies 3 · Apr 13, 2015

Replies: 3

Views: 2K

A Space Geek's Return to the Forums

Apr 11, 2015 · Replies 7 · Apr 13, 2015

Replies: 7

Views: 2K

Graduate Is Chaisson's View on Cosmic Evolution and Entropy Mainstream in Physics?

Apr 13, 2015 · Replies 5 · Apr 13, 2015

Replies: 5

Views: 2K

Chance for the public to name features on Pluto and Charon

Apr 11, 2015 · Replies 5 · Apr 13, 2015

Replies: 5

Views: 2K

Graduate Argument for Grand Design, maybe?

Apr 13, 2015 · Replies 1 · Apr 13, 2015

Replies: 1

Views: 1K

Graduate A couple of inflationary problems

Apr 12, 2015 · Replies 2 · Apr 12, 2015

Replies: 2

Views: 2K

High School Have you explored the incredible galaxies at Galaxy Zoo?

Jan 28, 2015 · Replies 5 · Apr 12, 2015

Replies: 5

Views: 3K

Graduate Does time expand along with space?

Apr 12, 2015 · Replies 2 · Apr 12, 2015

Replies: 2

Views: 2K

Graduate Calculating the age of the universe without a model?

Apr 8, 2015 · Replies 24 · Apr 11, 2015

Replies: 24

Views: 3K

Graduate Sublimation temperature of water in vacuum = 150K ?

Feb 17, 2015 · Replies 18 · Apr 11, 2015

Replies: 18

Views: 13K

Graduate Spectroscopic system, AB magnitudes

Apr 7, 2015 · Replies 2 · Apr 10, 2015

Replies: 2

Views: 2K

Undergrad Is the universe truly expanding?

Mar 24, 2015 · Replies 83 · Apr 10, 2015

3

Replies: 83

Views: 11K

Undergrad Why is the speed of light 186,000 miles per second?

Apr 5, 2015 · Replies 37 · Apr 10, 2015

2

Replies: 37

Views: 11K

Graduate Equation involving H and a re Accerlerating Universe

Mar 26, 2015 · Replies 8 · Apr 10, 2015

Replies: 8

Views: 1K

Undergrad Difference between a red giant and red supergiant?

Mar 28, 2015 · Replies 4 · Apr 10, 2015

Replies: 4

Views: 25K

Graduate Stefan-Boltzmann law, luminosity, brightness and magnitude?

Apr 9, 2015 · Replies 2 · Apr 9, 2015

Replies: 2

Views: 3K

Graduate Why do toddlers have a logarithmic understanding of numbers?

Apr 9, 2015 · Replies 11 · Apr 9, 2015

Replies: 11

Views: 14K

Undergrad Was Space Present Before the Big Bang?

Apr 7, 2015 · Replies 13 · Apr 9, 2015

Replies: 13

Views: 3K

Undergrad SDP.81 : how do we see the gavitational lens?

Apr 9, 2015 · Replies 2 · Apr 9, 2015

Replies: 2

Views: 1K

Undergrad Time Theory in Astrophysics: How Is It Possible?

Apr 8, 2015 · Replies 13 · Apr 8, 2015

Replies: 13

Views: 3K

Graduate Are atomic energies increasing as the Universe expands?

Apr 8, 2015 · Replies 2 · Apr 8, 2015

Replies: 2

Views: 1K

Undergrad Question About Gravitational Time Dilation

Apr 1, 2015 · Replies 3 · Apr 8, 2015

Replies: 3

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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