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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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Cosmological and doppler redshift

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

Replies: 2

Views: 2K

Why is the Moon going above Jupiter in the sky?

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

Replies: 16

Views: 2K

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

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

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

Replies: 10

Views: 4K

What Was Space and Time Before the Big Bang?

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

Replies: 2

Views: 2K

Calculating albedo and eccentricity

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

Replies: 3

Views: 3K

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

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

Replies: 1

Views: 991

Mystery of strange radio bursts from space

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

3

Replies: 63

Views: 11K

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

Is Oxygen-Based Life Possible in Other Galaxies?

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

Replies: 3

Views: 2K

Re. Dark matter. Concept of nothing

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

Replies: 2

Views: 1K

Flat galaxy rotation curves without dark matter

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

Replies: 1

Views: 3K

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

How to check a statement about orbital angles of exoplanets?

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

Replies: 2

Views: 2K

What is the Purpose of Fitting Supernova Remnant Spectra?

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

Replies: 1

Views: 1K

CRAYFIS Initiative: Is it Worth Joining?

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

Replies: 1

Views: 1K

Olbers' paradox and infinite number of stars

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

Replies: 16

Views: 4K

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: 1K

Saha equation partition function for Argon?

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

Replies: 5

Views: 4K

Which stage of the sun consists neutron star/stars

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

Replies: 3

Views: 1K

From what dark matter in space consist of?

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

Replies: 9

Views: 1K

Astronomy Calendar of Celestial Events

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

Replies: 17

Views: 8K

Technical stuff about visualizing BH (Hollywood helpers)

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

Replies: 3

Views: 2K

Origin of the Solar System: Understanding Hydrogen & Heavy Elements

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

Replies: 10

Views: 3K

Different understanding of the universe if .

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

Replies: 2

Views: 1K

Acceleration of expansion of Universe not that fast?

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

Replies: 2

Views: 2K

What Does Pluto Really Look Like?

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

Replies: 3

Views: 2K

Absolute magnitude and luminosity

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

Replies: 2

Views: 2K

Precession of Mercury and period of rotation

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

Replies: 1

Views: 2K

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

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

5

Replies: 122

Views: 20K

How do micro black holes maintain their state?

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

Replies: 3

Views: 2K

Difference in power and absolute magnitude of a star

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

Replies: 3

Views: 3K

How Are Electron Clouds Affected in Neutron Stars?

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

Replies: 18

Views: 3K

Black Hole Time Dilation And Observation Of Accretion

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

2

Replies: 30

Views: 5K

Are Pop III Stars Finally Detected in I Zw 18?

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

Replies: 5

Views: 2K

Observed Redshift Variation Over TIme

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

Replies: 3

Views: 1K

A Space Geek's Return to the Forums

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

Replies: 7

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

Have you explored the incredible galaxies at Galaxy Zoo?

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

Replies: 5

Views: 3K

Sublimation temperature of water in vacuum = 150K ?

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

Replies: 18

Views: 12K

Spectroscopic system, AB magnitudes

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

Replies: 2

Views: 2K

Is the universe truly expanding?

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

3

Replies: 83

Views: 9K

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

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

2

Replies: 37

Views: 11K

Difference between a red giant and red supergiant?

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

Replies: 4

Views: 25K

Stefan-Boltzmann law, luminosity, brightness and magnitude?

Apr 9, 2015 · Replies 2 · Apr 9, 2015

Replies: 2

Views: 3K

Why do toddlers have a logarithmic understanding of numbers?

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

Replies: 11

Views: 13K

Was Space Present Before the Big Bang?

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

Replies: 13

Views: 2K

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

Apr 9, 2015 · Replies 2 · Apr 9, 2015

Replies: 2

Views: 1K

Time Theory in Astrophysics: How Is It Possible?

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

Replies: 13

Views: 2K

Question About Gravitational Time Dilation

Apr 1, 2015 · Replies 3 · Apr 8, 2015

Replies: 3

Views: 2K

Favorite Prominent / Professional Astrophotographers

Apr 7, 2015 · Replies 2 · Apr 8, 2015

Replies: 2

Views: 1K

Death of Sun: Habitable Zone & Timeline

Mar 26, 2015 · Replies 8 · Apr 7, 2015

Replies: 8

Views: 3K

Doubt About Hour Angle: How Can It Change So Little?

Apr 6, 2015 · Replies 4 · Apr 6, 2015

Replies: 4

Views: 2K

Constant acceleration of gravity

Apr 5, 2015 · Replies 2 · Apr 6, 2015

Replies: 2

Views: 1K

Galaxy Merger Energy: Calculating Total System Energy

Apr 5, 2015 · Replies 8 · Apr 5, 2015

Replies: 8

Views: 2K

Julian Ephemeris Date from Ephemeris Time

Apr 3, 2015 · Replies 1 · Apr 3, 2015

Replies: 1

Views: 8K

What is the relationship between orbital semi latus rectum and angular momentum?

Apr 2, 2015 · Replies 3 · Apr 3, 2015

Replies: 3

Views: 5K

Why does the Sun behave like a black body?

Mar 24, 2015 · Replies 32 · Apr 3, 2015

2

Replies: 32

Views: 19K

Bending of space and time, is it true?

Mar 28, 2015 · Replies 71 · Apr 2, 2015

3

Replies: 71

Views: 7K

How Can We Harness the Power of Space Elevators and Atmospheric Electricity?

Mar 31, 2015 · Replies 7 · Apr 2, 2015

Replies: 7

Views: 2K

Black holes in the globular cluster M22 with Dr. Tom Maccarone

Mar 30, 2015 · Replies 12 · Apr 2, 2015

Replies: 12

Views: 4K

Planetary Alignment: Mercury Out of Sync

Mar 28, 2015 · Replies 12 · Apr 1, 2015

Replies: 12

Views: 3K

Stargazing Is this a realistic design for a kilometer wide telescope?

Mar 30, 2015 · Replies 14 · Apr 1, 2015

Replies: 14

Views: 4K

Scientific importance of total Solar eclipses?

Mar 31, 2015 · Replies 10 · Mar 31, 2015

Replies: 10

Views: 3K

The Potential of Titan: Igniting Methane Oceans for Photosynthesis

Mar 29, 2015 · Replies 34 · Mar 31, 2015

2

Replies: 34

Views: 4K

Do we all belong to the same star?

Mar 29, 2015 · Replies 7 · Mar 30, 2015

Replies: 7

Views: 2K

Proof to Kepler's first and second laws

Mar 30, 2015 · Replies 3 · Mar 30, 2015

Replies: 3

Views: 2K

Stargazing Understanding reflecting telescopes?

Mar 28, 2015 · Replies 6 · Mar 29, 2015

Replies: 6

Views: 4K

How wide is the observable horizon, at sea level?

Mar 27, 2015 · Replies 10 · Mar 29, 2015

Replies: 10

Views: 15K

High redshift galaxies in the HUDF

Mar 28, 2015 · Replies 1 · Mar 29, 2015

Replies: 1

Views: 2K

Fundamental Relationship Between Time and Space Derivatives

Mar 28, 2015 · Replies 6 · Mar 29, 2015

Replies: 6

Views: 4K

What is the center of a globular clusters made of?

Feb 12, 2015 · Replies 50 · Mar 28, 2015

2

Replies: 50

Views: 9K

Forming Stars: 2 Conditions and Criteria Explained

Mar 18, 2015 · Replies 5 · Mar 28, 2015

Replies: 5

Views: 2K

Classifying Exoplanets: Size & Surface Temperature

Mar 22, 2015 · Replies 6 · Mar 27, 2015

Replies: 6

Views: 4K

How Can We Reach Habitable Exoplanets?

Mar 27, 2015 · Replies 8 · Mar 27, 2015

Replies: 8

Views: 2K

Supernova prediction: SN Refsdal

Mar 27, 2015 · Replies 1 · Mar 27, 2015

Replies: 1

Views: 1K

Exoplanet Eccentricity vs Orbital Period

Mar 27, 2015 · Replies 5 · Mar 27, 2015

Replies: 5

Views: 2K

Saturn Day Shorter Than Expected | Ken Croswell | Science

Mar 25, 2015 · Replies 4 · Mar 27, 2015

Replies: 4

Views: 2K

Is the Hubble Telescope Smiling at a Gravitational Lens?

Feb 18, 2015 · Replies 12 · Mar 27, 2015

Replies: 12

Views: 2K

Stargazing How Do Lasers Work in Telescopes to Capture Images of the Universe?

Mar 25, 2015 · Replies 3 · Mar 27, 2015

Replies: 3

Views: 2K

Fake magnification and other information

Feb 25, 2015 · Replies 6 · Mar 27, 2015

Replies: 6

Views: 2K

Stargazing Understanding the Field of View of Reflecting and Refracting Telescopes

Mar 26, 2015 · Replies 9 · Mar 27, 2015

Replies: 9

Views: 6K

Question on possible dark matter classification

Mar 26, 2015 · Replies 9 · Mar 27, 2015

Replies: 9

Views: 2K

Question about spectral lines of stars?

Mar 27, 2015 · Replies 3 · Mar 27, 2015

Replies: 3

Views: 2K

I got a bad feelin' about this Chewie turn us around

Mar 25, 2015 · Replies 4 · Mar 26, 2015

Replies: 4

Views: 2K

Stargazing Quick question about telescope classification

Mar 26, 2015 · Replies 3 · Mar 26, 2015

Replies: 3

Views: 2K

Black Holes & Galaxies: How Do They Work Together?

Mar 25, 2015 · Replies 3 · Mar 26, 2015

Replies: 3

Views: 2K

Could a Collapsing Black Hole Be the Origin of Our Universe?

Mar 25, 2015 · Replies 9 · Mar 25, 2015

Replies: 9

Views: 2K

Stargazing Viewing stars through a refracting telescope?

Mar 25, 2015 · Replies 2 · Mar 25, 2015

Replies: 2

Views: 2K

Are Jupiter's bands visible with binoculars?

Mar 11, 2015 · Replies 17 · Mar 24, 2015

Replies: 17

Views: 5K

How Did I Capture Orion and Comet Lovejoy in Arizona?

Mar 22, 2015 · Replies 4 · Mar 24, 2015

Replies: 4

Views: 2K

Why is the universe considered to be flat?

Mar 24, 2015 · Replies 3 · Mar 24, 2015

Replies: 3

Views: 2K

Measuring Light Years: How Far Is the Andromeda Galaxy?

Mar 23, 2015 · Replies 3 · Mar 24, 2015

Replies: 3

Views: 2K

Entire universe ending with a supermassive black hole?

Mar 20, 2015 · Replies 10 · Mar 24, 2015

Replies: 10

Views: 3K

Did You Capture the March 17 Aurora Borealis?

Mar 22, 2015 · Replies 2 · Mar 23, 2015

Replies: 2

Views: 1K

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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