Skip to main content

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.

Filters

Graduate Is Space Infinite While Matter is Finite?

shifty88
Nov 7, 2011 · Replies 14 · Nov 10, 2011

Replies: 14

Views: 4K

Undergrad Which elements/compounds can be liquid on Venus?

Ontophile
Nov 8, 2011 · Replies 3 · Nov 10, 2011

Replies: 3

Views: 5K

Graduate How Can I Identify Elements in Jupiter's Absorption Spectrum?

Jahne7
Nov 9, 2011 · Replies 1 · Nov 9, 2011

Replies: 1

Views: 4K

Graduate Time Before Big Bang: Is Time Eternal?

revo74
Nov 8, 2011 · Replies 8 · Nov 9, 2011

Replies: 8

Views: 3K

What Higher Dimensions Feel Like

Hirams_bro
Nov 9, 2011 · Replies 6 · Nov 9, 2011

Replies: 6

Views: 3K

Graduate How gravitational potential effects mass?

new_r
Nov 8, 2011 · Replies 5 · Nov 8, 2011

Replies: 5

Views: 3K

Undergrad Measurement of Galaxy Rotation: How Long Does it Take?

jayaramas
Nov 7, 2011 · Replies 4 · Nov 8, 2011

Replies: 4

Views: 3K

High School Light year, explanation required?

optical mouse
Oct 31, 2011 · Replies 27 · Nov 8, 2011

Replies: 27

Views: 7K

Graduate Missing Matter - Is anything really Missing

yogi
Nov 2, 2011 · Replies 15 · Nov 7, 2011

Replies: 15

Views: 5K

Graduate Zero-energy_universe doesnt add up

granpa
Nov 7, 2011 · Replies 2 · Nov 7, 2011

Replies: 2

Views: 3K

Graduate Running in Space: Can You Accelerate?

vityav
Nov 5, 2011 · Replies 8 · Nov 7, 2011

Replies: 8

Views: 3K

Undergrad How feasible you think Nemesis theory is

Chewy0087
Jan 24, 2009 · Replies 5 · Nov 7, 2011

Replies: 5

Views: 5K

Stargazing Quick and Easy Telescope Measurments?

Willis666
Nov 4, 2011 · Replies 4 · Nov 7, 2011

Replies: 4

Views: 4K

Graduate Determining the dominant body in a basic planetary system simulation

TheHarvesteR
Nov 4, 2011 · Replies 7 · Nov 7, 2011

Replies: 7

Views: 4K

Undergrad The Drake Equation: Is there really other Life in the Universe?

PhysicsPost
Nov 4, 2011 · Replies 32 · Nov 7, 2011

2

Replies: 32

Views: 8K

Stargazing How can I safely view a solar eclipse?

PhysicsPost
Nov 4, 2011 · Replies 1 · Nov 7, 2011

Replies: 1

Views: 5K

Solar system on my date of Birth

sabrina82
Oct 27, 2011 · Replies 11 · Nov 7, 2011

Replies: 11

Views: 30K

Graduate Is the Universe Losing Mass Through Stellar Energy Conversion?

jayaramas
Nov 7, 2011 · Replies 1 · Nov 7, 2011

Replies: 1

Views: 4K

Graduate Why do so many people claim cyclic models brake down due to entropy?

lukesfn
Nov 6, 2011 · Replies 2 · Nov 7, 2011

Replies: 2

Views: 5K

Graduate The Raisin Bread Analogy Question

Julius Caesar
Oct 5, 2011 · Replies 36 · Nov 6, 2011

2

Replies: 36

Views: 14K

What is the best book on cosmology for all levels of knowledge?

think
May 13, 2003 · Replies 4 · Nov 5, 2011

Replies: 4

Views: 34K

Graduate Is the Center of the Milky Way Not What We Think?

kjensen
Nov 3, 2011 · Replies 11 · Nov 5, 2011

Replies: 11

Views: 6K

Graduate Creation of space what exactly does this mean

matthias31415
Oct 31, 2011 · Replies 20 · Nov 5, 2011

Replies: 20

Views: 6K

Graduate Black holes, dark matter, the expansion of the universe, and unifying theories.

robertfergus
Nov 3, 2011 · Replies 4 · Nov 5, 2011

Replies: 4

Views: 5K

Graduate Is the Big Bang Misunderstood as an Explosion in Static Space?

Imax
Nov 4, 2011 · Replies 2 · Nov 5, 2011

Replies: 2

Views: 3K

Graduate What is the ultimate fate of a massive star in space?

PhysicsPost
Nov 4, 2011 · Replies 1 · Nov 4, 2011

Replies: 1

Views: 4K

Graduate The limit of the observable universe

mrspeedybob
Nov 4, 2011 · Replies 8 · Nov 4, 2011

Replies: 8

Views: 4K

Undergrad Possible energy sources that a lunar base might have as an option

MonserrateM
Nov 3, 2011 · Replies 4 · Nov 4, 2011

Replies: 4

Views: 4K

Graduate Calculating density from CMB data

skippy1729
Nov 3, 2011 · Replies 3 · Nov 4, 2011

Replies: 3

Views: 3K

Undergrad Are orbital planes generally parallel on large scales?

mrspeedybob
Nov 3, 2011 · Replies 3 · Nov 4, 2011

Replies: 3

Views: 4K

High School Why Only One Sun & Moon on Earth?

rijaalu
Nov 3, 2011 · Replies 4 · Nov 4, 2011

Replies: 4

Views: 5K

Uncovering the Mystery: Has Something New Been Found?

Fusiontron
Nov 2, 2011 · Replies 1 · Nov 4, 2011

Replies: 1

Views: 3K

Graduate How to Accurately Convert FK5 to Altitude and Azimuth?

Scott S
Oct 30, 2011 · Replies 1 · Nov 3, 2011

Replies: 1

Views: 4K

High School What distance will a traveler cover if they walk in a southwesterly direction?

luiseduardo
Nov 2, 2011 · Replies 6 · Nov 3, 2011

Replies: 6

Views: 3K

Graduate Can Mic Oscillations Replace Dark Energy in Cosmic Expansion Models?

wolram
Nov 3, 2011 · Replies 1 · Nov 3, 2011

Replies: 1

Views: 2K

Graduate Questions Regarding The Expansion of The Universe

RobinSky
Oct 31, 2011 · Replies 17 · Nov 3, 2011

Replies: 17

Views: 4K

Virgin Galactic - the first step?

narrator
Nov 2, 2011 · Replies 7 · Nov 3, 2011

Replies: 7

Views: 4K

Graduate Is There a Hidden Cause Behind the Big Bang?

GarryS
Oct 20, 2011 · Replies 116 · Nov 3, 2011

4

Replies: 116

Views: 20K

Undergrad The size of the universe, and what we can see.

TheSwamper
Oct 25, 2011 · Replies 4 · Nov 2, 2011

Replies: 4

Views: 4K

Undergrad Why aren't stars in a star cluster attracted to each other?

texasblitzem
Oct 27, 2011 · Replies 25 · Nov 2, 2011

Replies: 25

Views: 9K

Graduate Exponential expansion and Higgs mechanism

lark
Oct 30, 2011 · Replies 15 · Nov 2, 2011

Replies: 15

Views: 4K

Graduate Elliptical Orbit's curvature the same at opposite ends of semi-major axis?

bahamagreen
Oct 29, 2011 · Replies 9 · Nov 2, 2011

Replies: 9

Views: 4K

Graduate We Know Less About CDM Than We Did Before

Dotini
Oct 19, 2011 · Replies 6 · Nov 1, 2011

Replies: 6

Views: 4K

Undergrad The sun moves through space, right?

phinds
Nov 1, 2011 · Replies 8 · Nov 1, 2011

Replies: 8

Views: 4K

High School What Are the Potential Benefits of a Lunar Base?

MonserrateM
Oct 26, 2011 · Replies 44 · Nov 1, 2011

2

Replies: 44

Views: 12K

Undergrad Will Pluto Crash into Neptune?

Philosophaie
Oct 8, 2011 · Replies 8 · Nov 1, 2011

Replies: 8

Views: 15K

Graduate Question: Regarding Stellar Spectroscopy Equipment.

Jahne7
Oct 28, 2011 · Replies 1 · Nov 1, 2011

Replies: 1

Views: 4K

Undergrad Gravitational Lenses & Light Frequency: Same or Different?

jayaramas
Oct 31, 2011 · Replies 1 · Oct 31, 2011

Replies: 1

Views: 3K

Undergrad How to simulate planets orbit curce around the sun ?

kjensen
Oct 28, 2011 · Replies 36 · Oct 31, 2011

2

Replies: 36

Views: 24K

High School Is Velocity Consistent in Planetary Orbits?

AakashPandita
Oct 13, 2011 · Replies 14 · Oct 31, 2011

Replies: 14

Views: 6K

Stargazing Choosing a Telescope: Orion vs Celestron

Willis666
Oct 29, 2011 · Replies 2 · Oct 31, 2011

Replies: 2

Views: 5K

Undergrad Why do scientists believe the expansion of the universe is accelerating?

sdemjanenko
Aug 30, 2006 · Replies 11 · Oct 31, 2011

Replies: 11

Views: 6K

High School If Universe is Expanding at an Accelerated Rate Why

ronholton
Oct 4, 2011 · Replies 22 · Oct 31, 2011

Replies: 22

Views: 6K

Undergrad Formation/Expansion of Red Giant

Guni22
Oct 25, 2011 · Replies 3 · Oct 31, 2011

Replies: 3

Views: 5K

Graduate Dark Matter Clumping: Unanswered Questions

bigmig
Oct 16, 2011 · Replies 26 · Oct 31, 2011

Replies: 26

Views: 8K

Graduate Can a spaceship land on a pulsar?

bostonnew
Oct 29, 2011 · Replies 7 · Oct 30, 2011

Replies: 7

Views: 5K

High School Is Dark Matter Just Unseen Water Vapor?

nmk
Jan 9, 2007 · Replies 9 · Oct 30, 2011

Replies: 9

Views: 10K

Undergrad Could the Universe's Expansion be Compared to Oil on Water?

pilgrum90
Oct 30, 2011 · Replies 3 · Oct 30, 2011

Replies: 3

Views: 3K

Graduate How can we measure time before the Big Bang?

kings7
Oct 26, 2011 · Replies 26 · Oct 30, 2011

Replies: 26

Views: 6K

Undergrad What is the estimated energy output of the Milky Way?

jayaramas
Oct 30, 2011 · Replies 1 · Oct 30, 2011

Replies: 1

Views: 3K

Graduate A question based on Lawrence Krauss' explanation

TRB8985
Oct 29, 2011 · Replies 3 · Oct 30, 2011

Replies: 3

Views: 4K

Graduate What if light speed wasn't the limit?

narrator
Oct 28, 2011 · Replies 10 · Oct 29, 2011

Replies: 10

Views: 5K

Undergrad Why are galaxies shaped like spirals?

jayaramas
Oct 29, 2011 · Replies 1 · Oct 29, 2011

Replies: 1

Views: 3K

Undergrad What are some applications of lasers in astrophysics research?

d3nat
Oct 24, 2011 · Replies 7 · Oct 29, 2011

Replies: 7

Views: 4K

Graduate Gravity and galaxy rotation curves: G vs. dynamics modifications?

hkyriazi
Oct 14, 2011 · Replies 38 · Oct 28, 2011

2

Replies: 38

Views: 9K

Graduate Quantum fluctuations and Spacetime

DonSmith
Oct 25, 2011 · Replies 3 · Oct 28, 2011

Replies: 3

Views: 4K

High School Andromeda Galaxy colliding with the Milky Wa

zytyxx
Oct 25, 2011 · Replies 14 · Oct 28, 2011

Replies: 14

Views: 5K

Undergrad Star to black hole same mass/gravity?

narrator
Oct 27, 2011 · Replies 4 · Oct 28, 2011

Replies: 4

Views: 4K

Undergrad Questions about Galactic Rotation

LaurieAG
Oct 22, 2011 · Replies 11 · Oct 28, 2011

Replies: 11

Views: 5K

Undergrad What is the Smallest Possible Size of a Black Hole?

jayaramas
Oct 27, 2011 · Replies 9 · Oct 28, 2011

Replies: 9

Views: 5K

Undergrad Is Gliese 581d a Goldilocks planet?

narrator
May 17, 2011 · Replies 52 · Oct 28, 2011

2

Replies: 52

Views: 13K

Graduate What would Fermi say now about his 'paradox'?

udtsith
Oct 26, 2011 · Replies 1 · Oct 28, 2011

Replies: 1

Views: 3K

Graduate Why are planetary orbits so circular?

oldman
Mar 4, 2009 · Replies 34 · Oct 27, 2011

2

Replies: 34

Views: 18K

Graduate Accelerating expansion of universe is an illusion

bohm2
Oct 1, 2011 · Replies 44 · Oct 27, 2011

2

Replies: 44

Views: 15K

Graduate PhD Astronomy Prof: Paucity of evidence for the Big Bang

csmcmillion
Oct 21, 2011 · Replies 19 · Oct 27, 2011

Replies: 19

Views: 5K

Graduate Time dilation & the first galaxies

PetTastic
Oct 26, 2011 · Replies 2 · Oct 27, 2011

Replies: 2

Views: 3K

Graduate What is information in a black hole

Astro.padma
Sep 18, 2011 · Replies 12 · Oct 27, 2011

Replies: 12

Views: 6K

Graduate How close to constraining DE to simply be Lambda?

marcus
Oct 26, 2011 · Replies 0 · Oct 26, 2011

Replies: 0

Views: 2K

High School Why doesn't tidal force pull earth and moon together?

AlonsoMcLaren
Oct 26, 2011 · Replies 4 · Oct 26, 2011

Replies: 4

Views: 4K

High School Neutron Stars vs Black Holes: What's the Difference?

jayaramas
Oct 24, 2011 · Replies 4 · Oct 26, 2011

Replies: 4

Views: 4K

Graduate Theoretical scenario for star-forming with a calculation

jcarper
Jun 22, 2011 · Replies 21 · Oct 26, 2011

Replies: 21

Views: 7K

Graduate Are cycles and entropy compatible?

bill alsept
Oct 17, 2011 · Replies 82 · Oct 26, 2011

3

Replies: 82

Views: 13K

Graduate What is expansion ? A thought experiment

matthias31415
Oct 18, 2011 · Replies 22 · Oct 25, 2011

Replies: 22

Views: 5K

Undergrad Why most of the galaxies are having two spiral arms only?

jayaramas
Oct 24, 2011 · Replies 5 · Oct 25, 2011

Replies: 5

Views: 3K

Graduate Is New Space Being Created Between Galaxies?

skydivephil
Oct 13, 2011 · Replies 8 · Oct 25, 2011

Replies: 8

Views: 5K

High School Explore Manhattanhenge – the Manhattan Solstice

Ironside
Jun 14, 2011 · Replies 3 · Oct 25, 2011

Replies: 3

Views: 4K

Graduate What are the main challenges in developing space-based solar power systems?

shashankac655
Oct 25, 2011 · Replies 2 · Oct 25, 2011

Replies: 2

Views: 4K

Graduate Time dilations and our perspective

bill alsept
Oct 24, 2011 · Replies 2 · Oct 24, 2011

Replies: 2

Views: 2K

Graduate Light travel paradox? Please, help to figure it out

Alexroma
Oct 21, 2011 · Replies 18 · Oct 24, 2011

Replies: 18

Views: 5K

Graduate Soft landiing an asteroid at the south pole

khoopes01
Oct 12, 2011 · Replies 24 · Oct 24, 2011

Replies: 24

Views: 7K

Graduate Universe cyclic model and energy loss

mtanti
Jul 6, 2008 · Replies 6 · Oct 24, 2011

Replies: 6

Views: 5K

Graduate Big Bang Theory and Shape of the Universe

Vorde
Oct 23, 2011 · Replies 6 · Oct 24, 2011

Replies: 6

Views: 3K

Graduate State Space control dervatives of input in B matrix.

controlboy
Oct 23, 2011 · Replies 1 · Oct 24, 2011

Replies: 1

Views: 3K

Graduate Ptolemy reduces to Kepler as Epicycles → ∞?

Geremia
Sep 10, 2011 · Replies 18 · Oct 24, 2011

Replies: 18

Views: 9K

Graduate Age of the Universe - is it meaningful?

Saddlestone
Oct 6, 2011 · Replies 22 · Oct 23, 2011

Replies: 22

Views: 5K

Graduate Loop bounce and geometric entropy (re: Bill A's question)

marcus
Oct 21, 2011 · Replies 6 · Oct 23, 2011

Replies: 6

Views: 3K

Undergrad Does the Universe Have a Center of Mass and Why Is It Expanding?

kahwawashay1
Oct 15, 2011 · Replies 26 · Oct 23, 2011

Replies: 26

Views: 9K

Undergrad How is the degree of vacuum in the Universe measured?

Yuri B.
Oct 18, 2011 · Replies 4 · Oct 23, 2011

Replies: 4

Views: 3K

Graduate Using Black holes to view our solar system

elegysix
Oct 22, 2011 · Replies 1 · Oct 22, 2011

Replies: 1

Views: 3K

Graduate Is there any way how to dispove that universe is a computer simulation?

No-where-man
Oct 22, 2011 · Replies 12 · Oct 22, 2011

Replies: 12

Views: 6K

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.

Top