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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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Graduate Is the Universe on the outside or inside?

Mind Bender
Nov 29, 2011 · Replies 1 · Nov 29, 2011

Replies: 1

Views: 3K

Graduate Why don't we see a lot of matter around black holes? And can we observe it?

Stargazer43
Nov 28, 2011 · Replies 4 · Nov 29, 2011

Replies: 4

Views: 3K

High School Difference between open and closed Universes?

Mind Bender
Nov 29, 2011 · Replies 1 · Nov 29, 2011

Replies: 1

Views: 6K

Graduate Might inflationary multiverses bumping cause anisotropy?

DrZforLife
Nov 28, 2011 · Replies 5 · Nov 29, 2011

Replies: 5

Views: 3K

Graduate Entropy & Expansion: Physical Interpretation of Maximum Entropy

rhydo19
Nov 2, 2011 · Replies 17 · Nov 29, 2011

Replies: 17

Views: 8K

Graduate How Many New Galaxies Will Appear in the Next Million Years?

PatrickPowers
Nov 29, 2011 · Replies 1 · Nov 29, 2011

Replies: 1

Views: 2K

High School Simplest Understanding of the Universe

JeremyL
Nov 27, 2011 · Replies 3 · Nov 29, 2011

Replies: 3

Views: 3K

Undergrad Parallax formula derivation problem?

Rishavutkarsh
Nov 27, 2011 · Replies 1 · Nov 29, 2011

Replies: 1

Views: 6K

Graduate Is time linear or cyclic in a flat, zero energy universe?

hiddenvariabl
Nov 28, 2011 · Replies 3 · Nov 28, 2011

Replies: 3

Views: 4K

Graduate Observed planets in binary star L4 or L5?

cephron
Nov 27, 2011 · Replies 1 · Nov 28, 2011

Replies: 1

Views: 4K

Graduate Is gravity a force or a property of space?

smithnya
Nov 17, 2011 · Replies 8 · Nov 27, 2011

Replies: 8

Views: 6K

High School Any Ideas for a Good Physics Research/ Report Project

whitefeather
Nov 27, 2011 · Replies 1 · Nov 27, 2011

Replies: 1

Views: 9K

Graduate Entropy, heat death and black holes

narrator
Nov 25, 2011 · Replies 4 · Nov 27, 2011

Replies: 4

Views: 4K

Graduate Absolute Zero and implications

mmg600
Jun 6, 2011 · Replies 26 · Nov 27, 2011

Replies: 26

Views: 11K

Graduate Has entrophy in the univerese increased throughout it's life.

Lino
Nov 6, 2011 · Replies 20 · Nov 26, 2011

Replies: 20

Views: 6K

Undergrad Question about the expansion of space.

2sin54
Nov 20, 2011 · Replies 34 · Nov 26, 2011

2

Replies: 34

Views: 6K

Graduate Is the Oort Cloud Large Enough to Encompass a Multi-Stellar System?

cph
Sep 7, 2011 · Replies 4 · Nov 26, 2011

Replies: 4

Views: 8K

Graduate Is Hubble's Law Applicable in a Co-Moving Frame?

johne1618
Nov 21, 2011 · Replies 4 · Nov 26, 2011

Replies: 4

Views: 3K

High School What Are the Orbital Periods of Binary Pulsars?

teroenza
Nov 16, 2011 · Replies 3 · Nov 25, 2011

Replies: 3

Views: 4K

High School Can We Still Receive Images from Voyager Probes?

RHK
Nov 17, 2011 · Replies 11 · Nov 25, 2011

Replies: 11

Views: 6K

High School Belelgeuse turning into a supernovae

amalmirando
Jun 21, 2011 · Replies 11 · Nov 25, 2011

Replies: 11

Views: 5K

Undergrad Singularity in Astrophysics: Meaning & Etymology

mhozdag
Nov 16, 2011 · Replies 14 · Nov 25, 2011

Replies: 14

Views: 7K

Graduate Is Our Expanding Universe the Result of Black Holes from Other Universes?

korben dallas
Nov 21, 2011 · Replies 24 · Nov 25, 2011

Replies: 24

Views: 5K

Graduate I have been told space and time are illusions. What does that mean?

Jonsson
Nov 22, 2011 · Replies 3 · Nov 25, 2011

Replies: 3

Views: 3K

Graduate Is the Universe Actually made of Math

stglyde
Nov 24, 2011 · Replies 1 · Nov 24, 2011

Replies: 1

Views: 4K

Undergrad Zero to infinity can we assume same for universe ?

rishi.sharma
Nov 15, 2011 · Replies 16 · Nov 24, 2011

Replies: 16

Views: 6K

Undergrad A question about star's luminosity, temperature and mass.

pixel01
Mar 20, 2008 · Replies 33 · Nov 24, 2011

2

Replies: 33

Views: 22K

Graduate Using WMAP to measure the Hubble's constant

ta66505477
Nov 22, 2011 · Replies 11 · Nov 24, 2011

Replies: 11

Views: 6K

High School Which scientist discovered the concept of a collapsing universe?

Bararontok
Nov 24, 2011 · Replies 1 · Nov 24, 2011

Replies: 1

Views: 2K

Graduate How Does a Black Hole Affect Time?

shifty88
Nov 10, 2011 · Replies 18 · Nov 24, 2011

Replies: 18

Views: 6K

Graduate Is Mars' Metallic Core Possible With a Mean Density Lower Than Earth's Mantle?

luozk123
Nov 23, 2011 · Replies 1 · Nov 23, 2011

Replies: 1

Views: 4K

Graduate Big Crunch may create time-reversal?

Mind Bender
Nov 22, 2011 · Replies 6 · Nov 23, 2011

Replies: 6

Views: 9K

Graduate Where does the heat of super-nova end up after black hole formation?

Khursed
Oct 28, 2011 · Replies 5 · Nov 23, 2011

Replies: 5

Views: 4K

Graduate What exists beyond the Universe?

Mind Bender
Nov 22, 2011 · Replies 2 · Nov 23, 2011

Replies: 2

Views: 5K

Graduate How Do Spiral Galaxies Maintain Their Shape?

twofu
Aug 6, 2011 · Replies 6 · Nov 22, 2011

Replies: 6

Views: 5K

Graduate Do Dark Matter and Black Holes Influence Each Other in Cosmology?

DarkMatterHol
Sep 13, 2010 · Replies 5 · Nov 22, 2011

Replies: 5

Views: 5K

Undergrad How sure can we be of the distances in the solar system?

Warp10
Nov 22, 2011 · Replies 2 · Nov 22, 2011

Replies: 2

Views: 3K

Undergrad What was the first mineral formed in the universe?

Whalstib
Nov 6, 2011 · Replies 7 · Nov 22, 2011

Replies: 7

Views: 9K

Graduate How many dimensions are there in a black hole

vinayjain
Nov 2, 2011 · Replies 55 · Nov 22, 2011

2

Replies: 55

Views: 15K

High School Viewing the Sun and Planets from the Asteroid Belt

Ender55
Nov 20, 2011 · Replies 7 · Nov 21, 2011

Replies: 7

Views: 6K

Undergrad Birth of a Planet: The Formation & Heavy Elements

wasi-uz-zaman
Oct 29, 2011 · Replies 2 · Nov 21, 2011

Replies: 2

Views: 3K

Undergrad How far did the signal of life in earth travelled yet?

WindScars
Nov 21, 2011 · Replies 2 · Nov 21, 2011

Replies: 2

Views: 2K

Graduate Age of Universe (Liddles Modern Cosmology)

hawker3
Nov 18, 2011 · Replies 3 · Nov 21, 2011

Replies: 3

Views: 3K

High School Who Is Right About the Sun's Position and Size?

Raul Lai
Nov 17, 2011 · Replies 5 · Nov 21, 2011

Replies: 5

Views: 4K

Graduate Neutron star spin and rotation axis

pmghss
Nov 18, 2011 · Replies 2 · Nov 21, 2011

Replies: 2

Views: 4K

Graduate Do We Really Understand the Singularity?

Jim92672
Nov 19, 2011 · Replies 2 · Nov 21, 2011

Replies: 2

Views: 3K

High School Why Do Planets Except Mercury Rotate in Same Direction?

Dana Dedrick
Apr 9, 2010 · Replies 6 · Nov 21, 2011

Replies: 6

Views: 6K

Graduate What is the composition of the crust and atmosphere on a neutron star?

Jimmy Snyder
Nov 20, 2011 · Replies 4 · Nov 21, 2011

Replies: 4

Views: 4K

Graduate What Is the Role of Thought in a Predetermined Universe?

xxxxxxxx
Nov 20, 2011 · Replies 3 · Nov 21, 2011

Replies: 3

Views: 4K

Graduate An embarrassing question: what were the boundaries of the universe

houhou.trad
Nov 17, 2011 · Replies 3 · Nov 21, 2011

Replies: 3

Views: 3K

Graduate What makes Dark Energy cause Acceleration of the Expanding Universe?

edearl
Nov 15, 2011 · Replies 15 · Nov 20, 2011

Replies: 15

Views: 6K

Undergrad Thanks for the interesting article.

Astronuc
Nov 18, 2011 · Replies 6 · Nov 20, 2011

Replies: 6

Views: 4K

Graduate Is our entire universe observable?

Philip7575
Nov 18, 2011 · Replies 19 · Nov 20, 2011

Replies: 19

Views: 5K

Undergrad How much did Earth's gravity alter the course of 2005 YU55?

2milehi
Nov 11, 2011 · Replies 24 · Nov 19, 2011

Replies: 24

Views: 9K

Undergrad Expansion of space and dark matter

spacetime1234
Apr 28, 2011 · Replies 17 · Nov 19, 2011

Replies: 17

Views: 6K

Graduate Do All Black Holes Exhibit Rotation?

Lino
Nov 14, 2011 · Replies 7 · Nov 19, 2011

Replies: 7

Views: 3K

Undergrad Is the Notion of Public Space a Myth?

John Creighto
Nov 13, 2011 · Replies 35 · Nov 18, 2011

2

Replies: 35

Views: 7K

Graduate Einstein wrong about speed limit?

DarkMatterHol
Nov 18, 2011 · Replies 2 · Nov 18, 2011

Replies: 2

Views: 3K

Undergrad What causes this shell of light around the Earth in this vedio?

Spinnor
Nov 16, 2011 · Replies 8 · Nov 18, 2011

Replies: 8

Views: 4K

Graduate Oort Cloud Dynamics: Speculations on Origins in a Sci-Fi Novel

Jack Dash
Nov 13, 2011 · Replies 3 · Nov 18, 2011

Replies: 3

Views: 4K

Graduate Expanding Universe vs. Shrinking Matter

zadignose
Aug 4, 2011 · Replies 23 · Nov 18, 2011

Replies: 23

Views: 20K

High School How do we know the universe is expanding?

anonchi
Nov 12, 2011 · Replies 9 · Nov 18, 2011

Replies: 9

Views: 5K

Stargazing What are the limitations of astrophotography and how can they be overcome?

Andy Resnick
Nov 14, 2011 · Replies 34 · Nov 18, 2011

2

Replies: 34

Views: 15K

Graduate Space-Time Black Holes: Measuring Warped Space/Time

THADONDARA
Nov 15, 2011 · Replies 5 · Nov 18, 2011

Replies: 5

Views: 3K

Undergrad How long would daylight last on Earth if the sun disappeared?

adjkgh
Nov 14, 2005 · Replies 30 · Nov 17, 2011

2

Replies: 30

Views: 14K

Graduate Universe expansion + light speed limit -> scale factor linear in time?

johne1618
Nov 16, 2011 · Replies 10 · Nov 17, 2011

Replies: 10

Views: 5K

Undergrad Are exploding supernovae responsible for heavy metal content in ancient stars?

manojr
Nov 16, 2011 · Replies 6 · Nov 17, 2011

Replies: 6

Views: 4K

Graduate How does the twin paradox work in a circular orbit?

phinds
Nov 16, 2011 · Replies 16 · Nov 16, 2011

Replies: 16

Views: 5K

Graduate Low entropy big bang Where am I going wrong with this interpretation?

Geodesic Worm
Oct 30, 2011 · Replies 17 · Nov 16, 2011

Replies: 17

Views: 8K

Graduate Big crunch versus the Cosmological Constant

zheng89120
Nov 15, 2011 · Replies 2 · Nov 16, 2011

Replies: 2

Views: 3K

Graduate Kinetic energy of gases in stars

Piano man
Nov 15, 2011 · Replies 3 · Nov 16, 2011

Replies: 3

Views: 6K

Undergrad Astrobiology Missions, whats being proposed?

skydivephil
Nov 16, 2011 · Replies 3 · Nov 16, 2011

Replies: 3

Views: 3K

Graduate Can anyone tell me the basics of Quasar?Note: Means that how it is

vinayjain
Oct 3, 2011 · Replies 26 · Nov 14, 2011

Replies: 26

Views: 8K

High School Spotting 2005 YU55: Instructions & Speed Info

DaveC426913
Nov 7, 2011 · Replies 42 · Nov 14, 2011

2

Replies: 42

Views: 10K

Undergrad Can variable stars become quickly non variable and viceversa?

Aidyan
Nov 11, 2011 · Replies 6 · Nov 13, 2011

Replies: 6

Views: 4K

Undergrad Earth and Moon Orbits Aligned: Consequences?

dreamgirl.360
Nov 12, 2011 · Replies 3 · Nov 13, 2011

Replies: 3

Views: 2K

Undergrad Could women be better suited for long distance space travel?

PhysicsPost
Nov 4, 2011 · Replies 48 · Nov 12, 2011

2

Replies: 48

Views: 14K

High School Can Astronomical Objects Orbit Around Satellites?

wukunlin
Nov 2, 2011 · Replies 12 · Nov 12, 2011

Replies: 12

Views: 7K

Graduate Unraveling the Mysteries of Dark Matter: Examining the Role of Light and Gravity

Zula110100100
Nov 11, 2011 · Replies 2 · Nov 12, 2011

Replies: 2

Views: 3K

Graduate Arto Annila - Universe's expansion may be understood without dark energy

TNick
Oct 24, 2011 · Replies 10 · Nov 11, 2011

Replies: 10

Views: 7K

Graduate Why is the existence of The Big Bang agreed upon?

MindAstronaut
Oct 29, 2011 · Replies 45 · Nov 11, 2011

2

Replies: 45

Views: 9K

Graduate Energy savings with space elevator

bksree
May 30, 2011 · Replies 19 · Nov 11, 2011

Replies: 19

Views: 7K

Graduate Four Forces vs. Fifth Force: Physicist's Insight

chaszz
Nov 9, 2011 · Replies 35 · Nov 11, 2011

2

Replies: 35

Views: 6K

Graduate Is the Universe growing in size?

mkarger
Nov 10, 2011 · Replies 5 · Nov 11, 2011

Replies: 5

Views: 3K

Graduate What Reference Frame Determines the Age of the Universe?

Eaglespike
Nov 10, 2011 · Replies 5 · Nov 11, 2011

Replies: 5

Views: 3K

Number of stars within 150 light years of us?

jerich1000
Oct 31, 2011 · Replies 4 · Nov 11, 2011

Replies: 4

Views: 12K

Graduate Confirmation of varying fine-structure constant

TrickyDicky
Nov 10, 2011 · Replies 3 · Nov 11, 2011

Replies: 3

Views: 3K

Graduate Would a collapsing universe break the Law for entropy

skeleton
Nov 9, 2011 · Replies 16 · Nov 11, 2011

Replies: 16

Views: 5K

Graduate Expansion speed and accelleration question

narrator
Nov 9, 2011 · Replies 12 · Nov 11, 2011

Replies: 12

Views: 4K

High School Light Pollution & National Dark Sky Week

PhysicsPost
Nov 4, 2011 · Replies 1 · Nov 10, 2011

Replies: 1

Views: 4K

Graduate Did the Universe's Components Emerge Simultaneously?

JeremyL
Nov 10, 2011 · Replies 1 · Nov 10, 2011

Replies: 1

Views: 2K

Graduate Are There Laws Governing the Passage of Time?

thedragonbook
Nov 10, 2011 · Replies 3 · Nov 10, 2011

Replies: 3

Views: 3K

Graduate Twinkle, twinkle, little star

Andy Resnick
Nov 10, 2011 · Replies 4 · Nov 10, 2011

Replies: 4

Views: 3K

Graduate The Big Bang and CP Violation: Where Did the Mass Go?

Khursed
Nov 10, 2011 · Replies 4 · Nov 10, 2011

Replies: 4

Views: 4K

Graduate Effect of the Galactic plane on the COBE CMBR measurements

Tanelorn
Nov 8, 2011 · Replies 7 · Nov 10, 2011

Replies: 7

Views: 4K

Undergrad What is the Speed of Universe Expansion and How Does it Affect Space Travel?

michael879
May 5, 2005 · Replies 27 · Nov 10, 2011

Replies: 27

Views: 13K

Graduate Does Fine Structure Constant Vary From Place to Place?

Dotini
Nov 3, 2011 · Replies 13 · Nov 10, 2011

Replies: 13

Views: 6K

Graduate Gleise 581g; does it exist and could it harbor life?

vanvlizr
Nov 9, 2011 · Replies 12 · Nov 10, 2011

Replies: 12

Views: 4K

Undergrad Does Energy Gravitate? Answers Here

wolram
Nov 9, 2011 · Replies 3 · Nov 10, 2011

Replies: 3

Views: 2K

Graduate Particles (The Universe) Popping Up Into Existence

RobinSky
Nov 8, 2011 · Replies 7 · Nov 10, 2011

Replies: 7

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.

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