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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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How Far Are Stars? Calculating Distance to Earth

Feb 5, 2009 · Replies 11 · Feb 12, 2009

Replies: 11

Views: 4K

Is a Cosmic Dust Storm Heading Our Way?

Feb 10, 2009 · Replies 1 · Feb 12, 2009

Replies: 1

Views: 3K

Literature on Black Hole Pair Production (?)

Feb 12, 2009 · Replies 3 · Feb 12, 2009

Replies: 3

Views: 2K

How is heat transfered in space?

Feb 10, 2009 · Replies 8 · Feb 11, 2009

Replies: 8

Views: 5K

Ciddor equation. this may be wrong forum, but i dont know where this goes.

Feb 10, 2009 · Replies 2 · Feb 10, 2009

Replies: 2

Views: 3K

Help me Super New bee many questions on energy-space relation and waves.

Jan 10, 2009 · Replies 18 · Feb 9, 2009

Replies: 18

Views: 3K

Schwarzschild’s equations & Newtonian Potential

Feb 8, 2009 · Replies 1 · Feb 9, 2009

Replies: 1

Views: 3K

Calculating Speed of Halley's Comet at Aphelion/Perihelion

Feb 4, 2009 · Replies 2 · Feb 9, 2009

Replies: 2

Views: 7K

What Is the Current Estimated Size of the Universe?

Jan 24, 2009 · Replies 17 · Feb 8, 2009

Replies: 17

Views: 7K

What I see in sky - Milky Way, other stars

Jan 27, 2009 · Replies 44 · Feb 8, 2009

2

Replies: 44

Views: 7K

Dropped popcorn kernel from space will it pop?

Feb 6, 2009 · Replies 3 · Feb 7, 2009

Replies: 3

Views: 3K

Where Does the Lost Energy Go in Cosmological Redshift?

Feb 6, 2009 · Replies 2 · Feb 7, 2009

Replies: 2

Views: 4K

Possibility of affordable interstellar space flight

Feb 4, 2009 · Replies 1 · Feb 7, 2009

Replies: 1

Views: 3K

Real time effects of light, light speed, and the sun?

Jan 5, 2006 · Replies 4 · Feb 6, 2009

Replies: 4

Views: 7K

Estimating the effective grammage of the galaxy

Feb 6, 2009 · Replies 1 · Feb 6, 2009

Replies: 1

Views: 2K

Stargazing Hubble Space Telescope: Learn What It Is & How It Works

Feb 6, 2009 · Replies 1 · Feb 6, 2009

Replies: 1

Views: 3K

Another Crackpot Theory: Neutrinos

Feb 5, 2009 · Replies 2 · Feb 5, 2009

Replies: 2

Views: 2K

Stargazing Surefire Tips for Photographing Comet Lulin?

Feb 5, 2009 · Replies 1 · Feb 5, 2009

Replies: 1

Views: 928

Do Strange Stars and Strange Black Holes Really Exist?

May 25, 2004 · Replies 6 · Feb 5, 2009

Replies: 6

Views: 6K

Time Scale Problem: Solving Diffusion Time of Particles in 2D Space

Feb 4, 2009 · Replies 1 · Feb 5, 2009

Replies: 1

Views: 2K

What is BIAS? Learn About CCDs With Randa

Jan 30, 2009 · Replies 4 · Feb 5, 2009

Replies: 4

Views: 6K

Astronomy for AS extended project + tips

Feb 2, 2009 · Replies 1 · Feb 4, 2009

Replies: 1

Views: 4K

IB extended essay in Astrophysics

Feb 4, 2009 · Replies 1 · Feb 4, 2009

Replies: 1

Views: 7K

Impossible to graph position vs time?

Jan 26, 2009 · Replies 7 · Feb 3, 2009

Replies: 7

Views: 6K

Can a Gelatinous Ooze Exist in the Vacuum of Space?

Feb 2, 2009 · Replies 6 · Feb 3, 2009

Replies: 6

Views: 2K

Orbital speed of stars within galaxies?

Mar 20, 2008 · Replies 9 · Feb 3, 2009

Replies: 9

Views: 14K

What was the Time of Baryon Asymmetry After the Big Bang?

Jan 31, 2009 · Replies 2 · Feb 3, 2009

Replies: 2

Views: 2K

Can a Close-up Apparatus Capture Distant Objects Like a Telescope?

Jan 30, 2009 · Replies 11 · Feb 2, 2009

Replies: 11

Views: 3K

Specific Intensity, Flux, Flux Density, Radiative Transfer

Jan 31, 2009 · Replies 1 · Feb 2, 2009

Replies: 1

Views: 10K

Amazing Mars animation with some facts

Jan 15, 2009 · Replies 1 · Jan 31, 2009

Replies: 1

Views: 3K

Can Time Differ in Nested Cylinders Traveling at Near-Light Speed?

Jan 28, 2009 · Replies 1 · Jan 29, 2009

Replies: 1

Views: 3K

Stargazing Why Doesn't the Secondary Mirror in a Cassegrain Telescope Cause a Blind Spot?

Jan 26, 2009 · Replies 7 · Jan 28, 2009

Replies: 7

Views: 7K

How many stars in the Solar neighbourhood

Jan 26, 2009 · Replies 9 · Jan 28, 2009

Replies: 9

Views: 4K

Fermi-Dirac Statistics: What Is It?

Jan 17, 2009 · Replies 1 · Jan 27, 2009

Replies: 1

Views: 2K

Calculating Mass and Density of Planets in Our Solar System

Jan 27, 2009 · Replies 2 · Jan 27, 2009

Replies: 2

Views: 2K

Moon's Inclination To Earth's Equator

Jan 22, 2009 · Replies 10 · Jan 27, 2009

Replies: 10

Views: 17K

How to measure the rotation period of the moon?

Jan 26, 2009 · Replies 8 · Jan 26, 2009

Replies: 8

Views: 5K

Changing the rotation of a natural satellite

Jan 25, 2009 · Replies 3 · Jan 26, 2009

Replies: 3

Views: 2K

Help with Escape Velocity Problem

Jan 25, 2009 · Replies 5 · Jan 25, 2009

Replies: 5

Views: 4K

Northern Lights: See a Light Pillar

Jan 24, 2009 · Replies 5 · Jan 24, 2009

Replies: 5

Views: 3K

Magnetic Reconnection vs Double Layers

Jan 21, 2009 · Replies 8 · Jan 24, 2009

Replies: 8

Views: 6K

What Are the Leading Theories Behind the Moon's Origin and Inclination?

Jan 22, 2009 · Replies 17 · Jan 24, 2009

Replies: 17

Views: 4K

Jets Big and Small: Understanding the Universe through High-Energy Emissions

Jan 11, 2009 · Replies 25 · Jan 24, 2009

Replies: 25

Views: 5K

Can We Measure the Diameter of Stars Using Angular Resolution and Other Methods?

Jan 23, 2009 · Replies 1 · Jan 23, 2009

Replies: 1

Views: 2K

Gravitational pull of a black hole

Jan 22, 2009 · Replies 3 · Jan 23, 2009

Replies: 3

Views: 4K

Rotating transparent object with stars - what was it?

Jan 21, 2009 · Replies 13 · Jan 23, 2009

Replies: 13

Views: 3K

What is the Difference Between 1D Spectra and 2D Spectra?

Jan 16, 2009 · Replies 9 · Jan 21, 2009

Replies: 9

Views: 11K

What Makes a Good Starter Telescope for a College Astronomy Student?

Jan 12, 2009 · Replies 10 · Jan 21, 2009

Replies: 10

Views: 3K

What Is the Stone’s Speed at 96,000 km From Earth?

Jan 19, 2009 · Replies 8 · Jan 20, 2009

Replies: 8

Views: 5K

Dark Matter: Could it be Plasma?

Mar 29, 2005 · Replies 23 · Jan 19, 2009

Replies: 23

Views: 13K

How Far Must a Planet Be to Become Tidally Locked with Different Star Types?

Jan 14, 2009 · Replies 1 · Jan 18, 2009

Replies: 1

Views: 3K

Lunar Geothermal Energy: Is it Usable?

Dec 28, 2008 · Replies 9 · Jan 18, 2009

Replies: 9

Views: 4K

Poll

VOTE PF PHOTO CONTEST - I'm in a wide open space

Jan 10, 2009 · Replies 10 · Jan 17, 2009

Replies: 10

Views: 2K

Could Baryonic Superfluids Explain Dark Matter's Mysteries?

Jan 15, 2009 · Replies 4 · Jan 16, 2009

Replies: 4

Views: 4K

Recent research relevant to quasar evolution

Jan 11, 2009 · Replies 6 · Jan 16, 2009

Replies: 6

Views: 4K

Is love like curved spacetime in this poem?

Jan 15, 2009 · Replies 3 · Jan 16, 2009

Replies: 3

Views: 2K

Why isn't the sun's rate-of-change in elevation constant?

Jan 14, 2009 · Replies 7 · Jan 15, 2009

Replies: 7

Views: 5K

Physical forces of a space collision

Jan 15, 2009 · Replies 3 · Jan 15, 2009

Replies: 3

Views: 2K

Source of synchotron radiation causing galactic background noise

Jan 13, 2009 · Replies 1 · Jan 15, 2009

Replies: 1

Views: 2K

Read article on Pulsars, not clear how a sphere sources pole-only emission?

Jan 14, 2009 · Replies 3 · Jan 15, 2009

Replies: 3

Views: 2K

Sun's Layer Dynamics: Charting Individual Motions

Jan 2, 2009 · Replies 8 · Jan 15, 2009

Replies: 8

Views: 3K

Deriving radial velocity as observed from infinity

Jan 12, 2009 · Replies 3 · Jan 15, 2009

Replies: 3

Views: 2K

Correcting for sun diameter and refraction in sunrise/sunset equations

Jan 8, 2009 · Replies 1 · Jan 14, 2009

Replies: 1

Views: 8K

What Happens Inside a Black Hole If Dark Matter Falls In?

Jan 6, 2009 · Replies 21 · Jan 14, 2009

Replies: 21

Views: 5K

Where does the galactic distance equation come from?

Jan 13, 2009 · Replies 2 · Jan 13, 2009

Replies: 2

Views: 2K

Methanol Maser Emission: Strength and Effects on Earth

Jan 13, 2009 · Replies 2 · Jan 13, 2009

Replies: 2

Views: 2K

How large would a moon impact event have to be to affect the Earth?

Dec 21, 2008 · Replies 2 · Jan 13, 2009

Replies: 2

Views: 6K

Energy required to fracture a planetary mass

Jan 12, 2009 · Replies 2 · Jan 13, 2009

Replies: 2

Views: 3K

Is the CDM particle still elusive?

Jan 12, 2009 · Replies 1 · Jan 12, 2009

Replies: 1

Views: 2K

Astrophysicist Neil DeGrasse Tyson. Death by Black Hole

Jan 7, 2009 · Replies 41 · Jan 11, 2009

2

Replies: 41

Views: 7K

Does Density Affect Gravity in the Formation of Neutron Stars?

Jan 11, 2009 · Replies 4 · Jan 11, 2009

Replies: 4

Views: 11K

PF PHOTO CONTEST - I'm in a wide open space (jan3-10)

Jan 3, 2009 · Replies 30 · Jan 10, 2009

2

Replies: 30

Views: 4K

Milky Way spins faster, has more mass than thought

Jan 6, 2009 · Replies 5 · Jan 9, 2009

Replies: 5

Views: 2K

How Did Planets and Moons Form from Cosmic Debris?

Dec 23, 2008 · Replies 11 · Jan 9, 2009

Replies: 11

Views: 4K

Origin of suspected black hole in Omega Centauri

Dec 9, 2008 · Replies 33 · Jan 9, 2009

2

Replies: 33

Views: 7K

Are Quasars and Galaxies Redshifts Truly Quantized?

Jan 5, 2009 · Replies 80 · Jan 8, 2009

3

Replies: 80

Views: 25K

Meade NGC-70TC Refractor Telescope: Left-to-Right Inversion Explained

Jan 8, 2009 · Replies 1 · Jan 8, 2009

Replies: 1

Views: 2K

Young galaxy's magnetism surprises astronomers

Jan 8, 2009 · Replies 2 · Jan 8, 2009

Replies: 2

Views: 3K

What is the Electric Field Strength of the Sun?

Dec 26, 2008 · Replies 7 · Jan 6, 2009

Replies: 7

Views: 14K

Parachute in Space: Can It Deploy?

Jan 3, 2009 · Replies 8 · Jan 6, 2009

Replies: 8

Views: 6K

Neutronium Armor: Could it Actually Protect?

Jul 24, 2005 · Replies 61 · Jan 5, 2009

3

Replies: 61

Views: 37K

Quasars: A Different Perspective?

Jan 1, 2009 · Replies 25 · Jan 4, 2009

Replies: 25

Views: 5K

Can the physics of consciousness transcend space-time?

Sep 12, 2003 · Replies 64 · Jan 4, 2009

3

Replies: 64

Views: 25K

What Are Some Stunning Astronomy Pictures?

Jan 3, 2009 · Replies 3 · Jan 4, 2009

Replies: 3

Views: 5K

How do satellites stay in orbit?

Mar 20, 2006 · Replies 7 · Jan 4, 2009

Replies: 7

Views: 14K

Is Dark Energy Just a Misunderstood Form of Gravity?

Jan 2, 2009 · Replies 5 · Jan 3, 2009

Replies: 5

Views: 3K

Dark matter or just unobservable?

Dec 24, 2008 · Replies 1 · Jan 3, 2009

Replies: 1

Views: 3K

Is the World Really Ending in 2012 as Some Predictors Claim?

Jan 15, 2008 · Replies 40 · Jan 3, 2009

2

Replies: 40

Views: 85K

Stargazing Why isn't my telescope magnifying properly?

Dec 25, 2008 · Replies 22 · Jan 2, 2009

Replies: 22

Views: 9K

Moon's Tidal Forces puff up Earth

Dec 18, 2008 · Replies 7 · Jan 2, 2009

Replies: 7

Views: 4K

Higgs Boson and Hawking Radiation

Dec 31, 2008 · Replies 5 · Jan 1, 2009

Replies: 5

Views: 3K

Can Antimatter Collision Create a Black Hole?

Dec 27, 2008 · Replies 6 · Dec 30, 2008

Replies: 6

Views: 3K

Photo of Einstein, Hubble, and LeMaitre together?

Dec 8, 2008 · Replies 2 · Dec 29, 2008

Replies: 2

Views: 6K

What is the 2 cap/hole on the 5 tube cap of the Celestron 130 SLT used for?

Dec 27, 2008 · Replies 2 · Dec 28, 2008

Replies: 2

Views: 3K

Earth's formation & Late Heavy Bombardment

Dec 27, 2008 · Replies 6 · Dec 27, 2008

Replies: 6

Views: 5K

Is Space Exploration Humanity's New Manifest Destiny?

Dec 26, 2008 · Replies 14 · Dec 27, 2008

Replies: 14

Views: 4K

How Do Spacecrafts Gain Speed in Space?

Dec 26, 2008 · Replies 7 · Dec 27, 2008

Replies: 7

Views: 3K

Unsolved Historical Mystery: Greek Astronomer's Mysterious Observations

Dec 22, 2008 · Replies 24 · Dec 25, 2008

Replies: 24

Views: 4K

Explaining blackholes dark matter ?

Dec 25, 2008 · Replies 1 · Dec 25, 2008

Replies: 1

Views: 2K

Why would large quantities of dark matter not stick together ?

Dec 21, 2008 · Replies 3 · Dec 22, 2008

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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