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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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Grail Mission to the Moon: Does Light Exert Pressure?

Dec 31, 2011 · Replies 2 · Jan 5, 2012

Replies: 2

Views: 4K

Why can Hawking Radiation not work in reverse?

Dec 27, 2011 · Replies 4 · Jan 5, 2012

Replies: 4

Views: 3K

Motion of celestial objects in Spacetime looks circular in 3D how?

Jan 5, 2012 · Replies 1 · Jan 5, 2012

Replies: 1

Views: 3K

When Will the Andromeda and Milky Way Galaxies Merge and Could it Support Life?

Nov 24, 2011 · Replies 18 · Jan 5, 2012

Replies: 18

Views: 8K

Neutron Star or a Pulsar - what decides

Dec 15, 2011 · Replies 5 · Jan 4, 2012

Replies: 5

Views: 4K

Questions on diatomic spectroscopy

Jan 1, 2012 · Replies 2 · Jan 3, 2012

Replies: 2

Views: 2K

Where can I find a comprehensive online database for stellar data analysis?

Dec 29, 2011 · Replies 5 · Jan 2, 2012

Replies: 5

Views: 4K

Universe age?, I never really understood that

Dec 7, 2011 · Replies 18 · Jan 2, 2012

Replies: 18

Views: 7K

Type IV Civilizations - Info & References

Mar 18, 2004 · Replies 4 · Jan 1, 2012

Replies: 4

Views: 10K

Position of a Body on a Hyperbolic/Parabolic Orbit with Respect to Time

Dec 29, 2011 · Replies 4 · Dec 30, 2011

Replies: 4

Views: 7K

Nonexistence outside the universe

Dec 23, 2011 · Replies 15 · Dec 30, 2011

Replies: 15

Views: 5K

Matter less Neutrons behave the same Less Inertia?

Dec 29, 2011 · Replies 14 · Dec 29, 2011

Replies: 14

Views: 3K

Stargazing Coronal mass ejection arriving during a solar eclipse

Dec 29, 2011 · Replies 2 · Dec 29, 2011

Replies: 2

Views: 4K

Please explain Dopler effect of light

Dec 24, 2011 · Replies 6 · Dec 29, 2011

Replies: 6

Views: 4K

How to become an astrophysicist or an astronomer ?

Dec 29, 2011 · Replies 2 · Dec 29, 2011

Replies: 2

Views: 6K

Angle of crab pulsar to the ecliptic

Dec 22, 2011 · Replies 5 · Dec 28, 2011

Replies: 5

Views: 4K

The speed of light, the term light year , and reference frames.

Dec 10, 2011 · Replies 8 · Dec 26, 2011

Replies: 8

Views: 7K

Poll

Do we want to sent probe to Newly discovered planet 'Kepler-22b' now?

Dec 10, 2011 · Replies 18 · Dec 25, 2011

Replies: 18

Views: 9K

What is the efficiency of solar energy in geosynchronous orbit?

Dec 22, 2011 · Replies 19 · Dec 25, 2011

Replies: 19

Views: 10K

Stargazing Which Mid-Priced Telescope Should I Choose?

Dec 22, 2011 · Replies 4 · Dec 24, 2011

Replies: 4

Views: 4K

Black Hole Falling in / Observer Perspective Question

Dec 16, 2011 · Replies 11 · Dec 24, 2011

Replies: 11

Views: 8K

Just how spherical is a neutron star?

Dec 12, 2011 · Replies 7 · Dec 24, 2011

Replies: 7

Views: 6K

Is it true that the earth's rotation is slowing down?

Dec 23, 2011 · Replies 6 · Dec 24, 2011

Replies: 6

Views: 6K

Can Black Hole Evaporation Preserve Entropy While Losing Mass?

Dec 11, 2011 · Replies 1 · Dec 23, 2011

Replies: 1

Views: 3K

Difference between shock wave and shock ?

Nov 23, 2011 · Replies 2 · Dec 23, 2011

Replies: 2

Views: 4K

The meaning of z number in red shift

Dec 20, 2011 · Replies 7 · Dec 23, 2011

Replies: 7

Views: 4K

Universal Expansion and the Distribution of Light

Dec 22, 2011 · Replies 4 · Dec 23, 2011

Replies: 4

Views: 3K

Could a Neutron Star's Color be Rayleigh-Jeans Blue?

Mar 23, 2009 · Replies 23 · Dec 23, 2011

Replies: 23

Views: 34K

Indoor Astronomy: Viewing Options for Cold Places

Dec 22, 2011 · Replies 14 · Dec 22, 2011

Replies: 14

Views: 5K

Why does Venus have an atmosphere?

Jul 14, 2011 · Replies 19 · Dec 22, 2011

Replies: 19

Views: 17K

Life on Europa vs. Jupiter's Electromagnetic field

Dec 20, 2011 · Replies 11 · Dec 22, 2011

Replies: 11

Views: 5K

A question on virtual antiparticles and Hawking Radiation

Dec 21, 2011 · Replies 4 · Dec 22, 2011

Replies: 4

Views: 4K

Why Is a Distant Galaxy Blue Despite Redshift?

Dec 21, 2011 · Replies 5 · Dec 22, 2011

Replies: 5

Views: 3K

Icy(?) Comet Survives Pasage thru Solar Corona

Dec 17, 2011 · Replies 8 · Dec 21, 2011

Replies: 8

Views: 5K

Are Black Holes Deceivingly Still?

Dec 17, 2011 · Replies 16 · Dec 21, 2011

Replies: 16

Views: 4K

Dark Energy & Expansion of the Universe; Really ?

Nov 24, 2011 · Replies 12 · Dec 20, 2011

Replies: 12

Views: 4K

Why is Venus's atmosphere so hot?

Jun 28, 2008 · Replies 34 · Dec 20, 2011

2

Replies: 34

Views: 16K

Why Do Pulsars Emit Radiation Despite Being Current Loops?

Dec 19, 2011 · Replies 1 · Dec 19, 2011

Replies: 1

Views: 3K

Martian Pole Star: Same as Earth's?

Dec 17, 2011 · Replies 6 · Dec 18, 2011

Replies: 6

Views: 4K

Are Black Holes Proven or Just Theoretical Constructs?

Dec 14, 2011 · Replies 36 · Dec 18, 2011

2

Replies: 36

Views: 10K

Is Black Hole Gravity Strong Enough to Crush Earth into a Watermelon?

Dec 16, 2011 · Replies 2 · Dec 16, 2011

Replies: 2

Views: 4K

What Causes Sunspots and How Do They Affect Solar Brightness?

Nov 22, 2011 · Replies 6 · Dec 16, 2011

Replies: 6

Views: 4K

Can Scientists Capture Images of Distant Stars Like Betelgeuse?

Dec 14, 2011 · Replies 6 · Dec 16, 2011

Replies: 6

Views: 3K

Neutron star and white dwarf material

Dec 14, 2011 · Replies 9 · Dec 15, 2011

Replies: 9

Views: 4K

If you leave Earth traveling at .01c can you reach Saturn in 6 days?

Dec 15, 2011 · Replies 2 · Dec 15, 2011

Replies: 2

Views: 2K

What Causes the Expansion of the Universe?

Sep 12, 2005 · Replies 9 · Dec 15, 2011

Replies: 9

Views: 8K

Supernova SN 2011fe Still Alive and Kicking

Nov 30, 2011 · Replies 10 · Dec 14, 2011

Replies: 10

Views: 5K

The resulting mass of the remnant of a core-collapse SN

Dec 1, 2011 · Replies 10 · Dec 14, 2011

Replies: 10

Views: 4K

I think the universe is slowing down not speeding up

Dec 3, 2011 · Replies 12 · Dec 14, 2011

Replies: 12

Views: 5K

Causal entropic principle / entropic principle

Mar 1, 2010 · Replies 1 · Dec 14, 2011

Replies: 1

Views: 6K

Black Holes: Falling in and Looking out?

Dec 13, 2011 · Replies 10 · Dec 14, 2011

Replies: 10

Views: 5K

What is the current understanding of the galactic magnetic field?

Dec 9, 2011 · Replies 16 · Dec 14, 2011

Replies: 16

Views: 6K

Could Telescopes Ever Capture Detailed Images of Exoplanet Surfaces?

Dec 3, 2011 · Replies 19 · Dec 13, 2011

Replies: 19

Views: 10K

Kepler22b-first exoplanet found in hab-zone of sun-like star

Dec 5, 2011 · Replies 37 · Dec 13, 2011

2

Replies: 37

Views: 15K

AU and the Circumstellar Habitable Zone

Dec 12, 2011 · Replies 2 · Dec 13, 2011

Replies: 2

Views: 3K

Surviving Space: The Impact of Hemoglobin Levels on Human Body in a Vacuum

Dec 12, 2011 · Replies 6 · Dec 13, 2011

Replies: 6

Views: 3K

What Happens When Two Black Holes Collide?

Oct 28, 2011 · Replies 6 · Dec 12, 2011

Replies: 6

Views: 4K

Stargazing Eclipse of the Moon from Sydney, Australia 10 Dec 2011 video

Dec 11, 2011 · Replies 2 · Dec 12, 2011

Replies: 2

Views: 3K

Movement in time/movement in space

Dec 11, 2011 · Replies 1 · Dec 11, 2011

Replies: 1

Views: 3K

Mars Atmosphere And Magnetic Field

Nov 16, 2011 · Replies 5 · Dec 11, 2011

Replies: 5

Views: 6K

SECCHI Uncovers What? Near Mercury

Dec 11, 2011 · Replies 2 · Dec 11, 2011

Replies: 2

Views: 4K

Influence of metallicity on effective temperature of star

Dec 9, 2011 · Replies 4 · Dec 11, 2011

Replies: 4

Views: 7K

Highest Star Core Temperature: Does Size Matter?

Dec 9, 2011 · Replies 8 · Dec 11, 2011

Replies: 8

Views: 19K

Relativistic effects on planetary shear [tidal forces]

Dec 7, 2011 · Replies 3 · Dec 11, 2011

Replies: 3

Views: 3K

Is Dark Energy Necessary for the Acceleration of the Universe's Expansion?

Oct 18, 2011 · Replies 131 · Dec 11, 2011

5

Replies: 131

Views: 22K

Can the Mass of a Black Hole Bend Time and Space?

Dec 6, 2011 · Replies 5 · Dec 10, 2011

Replies: 5

Views: 3K

How realistic are the colors that we see in pictures of galaxies/nebulas?

Nov 29, 2011 · Replies 11 · Dec 10, 2011

Replies: 11

Views: 25K

Stargazing Ever wonder what happens during a lunar eclipse?

Dec 9, 2011 · Replies 20 · Dec 10, 2011

Replies: 20

Views: 4K

Neutron Star Below the Chandrasehkar Limit - Properties & Atomic Matter?

Dec 5, 2011 · Replies 15 · Dec 8, 2011

Replies: 15

Views: 4K

Half Light Speed Probes: See What Earth Sees

Dec 8, 2011 · Replies 3 · Dec 8, 2011

Replies: 3

Views: 3K

Could Our Universe Be Inside a Black Hole?

Dec 6, 2011 · Replies 6 · Dec 8, 2011

Replies: 6

Views: 3K

Impact & Gravitational Effects of Asteroids/Comets on Moons Orbit

Dec 6, 2011 · Replies 8 · Dec 8, 2011

Replies: 8

Views: 3K

Having trouble understanding how We are made from a supernova?

Mar 9, 2011 · Replies 12 · Dec 8, 2011

Replies: 12

Views: 11K

Few Question from a Naive Astro enthusiast

Dec 6, 2011 · Replies 6 · Dec 7, 2011

Replies: 6

Views: 3K

Fascinated by the space,stars,sky

Dec 7, 2011 · Replies 3 · Dec 7, 2011

Replies: 3

Views: 3K

Astronomical spectroscopy and doppler shift.

Nov 28, 2011 · Replies 9 · Dec 7, 2011

Replies: 9

Views: 5K

Problem understanding NBody simulation physics

Dec 7, 2011 · Replies 3 · Dec 7, 2011

Replies: 3

Views: 3K

Find the Lead Pursuit Line to Reach a Planet

Dec 6, 2011 · Replies 3 · Dec 6, 2011

Replies: 3

Views: 3K

How intimate are the rays of light?

Dec 5, 2011 · Replies 5 · Dec 6, 2011

Replies: 5

Views: 3K

Why do people ask why life exists?

Dec 6, 2004 · Replies 11 · Dec 6, 2011

Replies: 11

Views: 11K

Does Our Milky Way Stir Up Solar System Collisions?

Dec 6, 2011 · Replies 1 · Dec 6, 2011

Replies: 1

Views: 3K

Black hole vs. Black hole, who wins?

Mar 19, 2008 · Replies 44 · Dec 6, 2011

2

Replies: 44

Views: 26K

What Causes Time Dilation on Mars?

Nov 24, 2011 · Replies 11 · Dec 6, 2011

Replies: 11

Views: 6K

Could a Black Hole Be 10 Billion Times Larger Than the Sun?

Dec 5, 2011 · Replies 1 · Dec 5, 2011

Replies: 1

Views: 2K

The Blushing Face of Saturn: Radiance, Luminosity & Habitable Zone

Dec 4, 2011 · Replies 2 · Dec 5, 2011

Replies: 2

Views: 3K

Stargazing Is the Hubble Telescope Obsolete?

Nov 28, 2011 · Replies 10 · Dec 5, 2011

Replies: 10

Views: 9K

Using Rspec to Interpret Stellar Spectra

Dec 3, 2011 · Replies 4 · Dec 4, 2011

Replies: 4

Views: 3K

Do you think astronomy is a useful science?

Jan 1, 2004 · Replies 23 · Dec 4, 2011

Replies: 23

Views: 17K

What is the rate at which the CMBR is cooling?

Nov 28, 2011 · Replies 6 · Dec 4, 2011

Replies: 6

Views: 3K

Computation of Solar Position and Velocity Vectors (Meteor Orbit)

Dec 3, 2011 · Replies 1 · Dec 3, 2011

Replies: 1

Views: 2K

First post ever. Be Kind. Solar orbit questions

Nov 29, 2011 · Replies 8 · Dec 2, 2011

Replies: 8

Views: 3K

Bill O'Reilly the master of Astronomy?

Nov 30, 2011 · Replies 6 · Dec 2, 2011

Replies: 6

Views: 3K

About the hot gas around NGC 4555

Dec 1, 2011 · Replies 2 · Dec 1, 2011

Replies: 2

Views: 2K

Anyone have access to the 1955 Nautical Almanac?

Nov 29, 2011 · Replies 3 · Dec 1, 2011

Replies: 3

Views: 2K

How Can I Solve a Two-Body System Using Kepler's First Law?

Nov 26, 2011 · Replies 11 · Dec 1, 2011

Replies: 11

Views: 5K

Can we get caught by surprise by an asteroid?

Nov 6, 2011 · Replies 13 · Nov 30, 2011

Replies: 13

Views: 6K

Is the Mass of Super-Massive Black Holes Factored into Dark Matter Calculations?

Jul 31, 2011 · Replies 47 · Nov 30, 2011

2

Replies: 47

Views: 14K

Parallax formula derivation problem?

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

Replies: 1

Views: 6K

Observed planets in binary star L4 or L5?

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

Replies: 1

Views: 3K

Is gravity a force or a property of space?

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

Replies: 8

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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