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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 Are Declination and Right Ascension Measured in the Celestial Sphere?

Jan 25, 2010 · Replies 1 · Jan 25, 2010

Replies: 1

Views: 4K

Inflation Theory: Could There Be Other Bubble Universes?

Jan 20, 2010 · Replies 1 · Jan 24, 2010

Replies: 1

Views: 2K

Star populations by spectral classes and masses

Jan 23, 2010 · Replies 8 · Jan 24, 2010

Replies: 8

Views: 3K

Star generatations making elements

Jan 21, 2010 · Replies 3 · Jan 24, 2010

Replies: 3

Views: 2K

What Are Some Math-Focused Astrophysics Thesis Ideas?

Jan 20, 2010 · Replies 2 · Jan 24, 2010

Replies: 2

Views: 6K

How did we photograph the universe?

Jan 23, 2010 · Replies 4 · Jan 24, 2010

Replies: 4

Views: 3K

Can We Create Artificial Black Holes? | About Blackholes

Oct 25, 2004 · Replies 18 · Jan 22, 2010

Replies: 18

Views: 5K

Is Earth the center of the universe?

Mar 3, 2009 · Replies 24 · Jan 22, 2010

Replies: 24

Views: 7K

Dark Matter and Gravity: Misunderstood Connections?

Jan 20, 2010 · Replies 8 · Jan 21, 2010

Replies: 8

Views: 4K

Earth-Sun Vector, Ecliptic to Equatorial Coordinates

Jan 21, 2010 · Replies 3 · Jan 21, 2010

Replies: 3

Views: 9K

Age of Universe: Impact of Expanding Acceleration?

Jan 14, 2010 · Replies 2 · Jan 20, 2010

Replies: 2

Views: 2K

Stargazing Uncovering the Truth Behind Solar Eclipse Anomalies

Jan 14, 2010 · Replies 7 · Jan 20, 2010

Replies: 7

Views: 4K

Information is a kind of dimension (like space and time)

Jan 18, 2010 · Replies 5 · Jan 19, 2010

Replies: 5

Views: 3K

Three-Body Problem Problem ( Astronomers )

Jan 15, 2010 · Replies 16 · Jan 18, 2010

Replies: 16

Views: 4K

Measuring dark matter's repulsive force

Jan 6, 2010 · Replies 36 · Jan 18, 2010

2

Replies: 36

Views: 7K

Gravitational lensing angle equation

Jan 17, 2010 · Replies 2 · Jan 18, 2010

Replies: 2

Views: 3K

Supernovae Wind Shape Small Galaxies: Governato et al.

Jan 18, 2010 · Replies 1 · Jan 18, 2010

Replies: 1

Views: 2K

What do you mean by 'multi-dimensional'?

Jan 17, 2010 · Replies 8 · Jan 18, 2010

Replies: 8

Views: 4K

Why Is the Search for Extrasolar Planets Crucial for Humanity?

Jan 15, 2010 · Replies 14 · Jan 17, 2010

Replies: 14

Views: 4K

General Relativity and galactic rotational speeds

Jan 16, 2010 · Replies 11 · Jan 17, 2010

Replies: 11

Views: 3K

Compare Images of 7x50, 15x70 & 25x100 Binoculars Pointed at Objects in Space

Jun 16, 2009 · Replies 20 · Jan 16, 2010

Replies: 20

Views: 7K

Stargazing Solar eclipse and radiation levels

Jan 16, 2010 · Replies 2 · Jan 16, 2010

Replies: 2

Views: 6K

Directing Space Junk to the Moon: Feasibility & Benefits

Jan 15, 2010 · Replies 1 · Jan 15, 2010

Replies: 1

Views: 2K

Stargazing Solar Eclipse Captured - See Photos & Video of My 3.2MP Camera

Jan 15, 2010 · Replies 1 · Jan 15, 2010

Replies: 1

Views: 3K

Hubble's Staircase Effect: What Caused It and How Was It Fixed?

Jan 15, 2010 · Replies 3 · Jan 15, 2010

Replies: 3

Views: 3K

The firmament is not as we see it, but

Jan 14, 2010 · Replies 3 · Jan 14, 2010

Replies: 3

Views: 2K

Do Pulsars Emit a Sonic Boom in Space?

Jan 7, 2010 · Replies 2 · Jan 14, 2010

Replies: 2

Views: 4K

Mass of star as function of Luminosity, Temperature and size

Jan 13, 2010 · Replies 9 · Jan 14, 2010

Replies: 9

Views: 15K

Light speed and gravitational matrix

Jan 14, 2010 · Replies 3 · Jan 14, 2010

Replies: 3

Views: 2K

Which Would Reach Pluto First: Light or Stick Movement?

Jan 12, 2010 · Replies 7 · Jan 14, 2010

Replies: 7

Views: 4K

Mysterious Martian 'Forests' Discovered

Jan 14, 2010 · Replies 2 · Jan 14, 2010

Replies: 2

Views: 3K

Is a Giant Moon Essential for Life on Earth?

Jan 12, 2010 · Replies 4 · Jan 14, 2010

Replies: 4

Views: 3K

The Moon moves away from the earth - Is the theory correct ?

Oct 3, 2008 · Replies 33 · Jan 13, 2010

2

Replies: 33

Views: 37K

Could This Be a Nova or Supernova Seen on Dec 26?

Dec 26, 2009 · Replies 4 · Jan 13, 2010

Replies: 4

Views: 4K

Dark Matter Spin: Is WIMP DM Different?

Jan 12, 2010 · Replies 8 · Jan 13, 2010

Replies: 8

Views: 3K

Aurora borealis over India is it possible?

Jan 12, 2010 · Replies 7 · Jan 12, 2010

Replies: 7

Views: 16K

Some questions mostly dealing with large objects in space.

Jan 12, 2010 · Replies 1 · Jan 12, 2010

Replies: 1

Views: 2K

How does a collapsing core become a black hole?

Jan 12, 2010 · Replies 4 · Jan 12, 2010

Replies: 4

Views: 3K

Magnetic diffusivity : significance?

Jan 7, 2010 · Replies 5 · Jan 12, 2010

Replies: 5

Views: 3K

Singularities, dark matter, and dark energy. A connection?

Jan 9, 2010 · Replies 4 · Jan 12, 2010

Replies: 4

Views: 7K

Question: what exactly is a singularity?

Jan 11, 2010 · Replies 4 · Jan 12, 2010

Replies: 4

Views: 3K

Using stars random distribution to determine presence of gravity

Jan 11, 2010 · Replies 3 · Jan 11, 2010

Replies: 3

Views: 3K

Are Spiral Galaxies Truly Spirals or Just an Optical Illusion?

Jan 8, 2010 · Replies 9 · Jan 11, 2010

Replies: 9

Views: 11K

Questions about Black Holes: Can Objects Survive? Can Light Go Through?

Mar 14, 2009 · Replies 12 · Jan 10, 2010

Replies: 12

Views: 3K

Space Elevator: Carbon Nanotubes, Lasers & Beamed Energy

Dec 3, 2009 · Replies 9 · Jan 10, 2010

Replies: 9

Views: 4K

Converting Intensity into magnitudes

Jan 9, 2010 · Replies 1 · Jan 9, 2010

Replies: 1

Views: 3K

Neutron Star Collisions: Effects & Stages

Jan 3, 2010 · Replies 9 · Jan 9, 2010

Replies: 9

Views: 7K

Stargazing What is the bottom limit of telescopes and why can't they detect visible light?

Jan 7, 2010 · Replies 2 · Jan 9, 2010

Replies: 2

Views: 3K

Can Black Holes Consume the Entire Universe?

Jan 8, 2010 · Replies 2 · Jan 8, 2010

Replies: 2

Views: 2K

Nearby supernova risk discussed by Sigurdsson

Jan 6, 2010 · Replies 9 · Jan 7, 2010

Replies: 9

Views: 4K

T Pyxidis Supernova: Energy Release Compared to SN1054

Jan 7, 2010 · Replies 2 · Jan 7, 2010

Replies: 2

Views: 2K

Does the moon cause the flux and reflux of the tides?

Dec 30, 2009 · Replies 6 · Jan 6, 2010

Replies: 6

Views: 8K

How Do We Measure the Size of the Universe?

Jan 5, 2010 · Replies 6 · Jan 6, 2010

Replies: 6

Views: 3K

Gravity on the surface of Gliese 581 d

Dec 1, 2009 · Replies 19 · Jan 6, 2010

Replies: 19

Views: 16K

How did universe start to expand

Jan 2, 2010 · Replies 9 · Jan 6, 2010

Replies: 9

Views: 5K

Fermi Telescope Spots Giant Explosion in Space

Mar 4, 2009 · Replies 21 · Jan 5, 2010

Replies: 21

Views: 7K

How to calculate r.m.s radius of a N-body system?

Jan 5, 2010 · Replies 1 · Jan 5, 2010

Replies: 1

Views: 5K

Do black holes evaporate or go bang ?

Aug 8, 2005 · Replies 31 · Jan 5, 2010

2

Replies: 31

Views: 18K

See the Diffraction of Moon Light at Night

Jan 3, 2010 · Replies 3 · Jan 5, 2010

Replies: 3

Views: 3K

Shouldn't All Black Holes Have EM Wave Halos?

Jan 4, 2010 · Replies 1 · Jan 4, 2010

Replies: 1

Views: 3K

Possible misenterpretations of the known universe

Dec 31, 2009 · Replies 3 · Jan 4, 2010

Replies: 3

Views: 2K

Cellular phones and reverse SETI

Jan 3, 2010 · Replies 9 · Jan 3, 2010

Replies: 9

Views: 3K

Understanding Magnitude Systems in Extragalactic Imaging

Jan 2, 2010 · Replies 1 · Jan 2, 2010

Replies: 1

Views: 2K

Producing a CCD Image: Corrections, Calibration, Subexposures

Jan 2, 2010 · Replies 2 · Jan 2, 2010

Replies: 2

Views: 3K

What is the Direction of Orbiting Planets around the Sun?

Jan 1, 2010 · Replies 1 · Jan 1, 2010

Replies: 1

Views: 3K

Potential Vacuum Energy: Does it Double Every 11B Years?

Dec 29, 2009 · Replies 7 · Dec 30, 2009

Replies: 7

Views: 3K

Cosmological constant or dark energy or vaccum denisty/energy/energy density

Dec 24, 2009 · Replies 9 · Dec 30, 2009

Replies: 9

Views: 7K

Confused about the event horizon

Dec 26, 2009 · Replies 7 · Dec 30, 2009

Replies: 7

Views: 3K

Is Space-Time Really a Woven Fabric?

Dec 30, 2009 · Replies 6 · Dec 30, 2009

Replies: 6

Views: 4K

How to calculate the orbit of a minor planet?

Dec 27, 2009 · Replies 2 · Dec 29, 2009

Replies: 2

Views: 4K

Why Do Some Galaxies Have Warped Structures?

Dec 28, 2009 · Replies 5 · Dec 29, 2009

Replies: 5

Views: 4K

Why has no one seen Neptune with the naked eye?

Dec 11, 2009 · Replies 5 · Dec 28, 2009

Replies: 5

Views: 17K

Is dark matter hiding in plain sight?

Dec 17, 2009 · Replies 38 · Dec 28, 2009

2

Replies: 38

Views: 14K

Does Gravity Affect Nuclear Reactions in Space?

Dec 25, 2009 · Replies 5 · Dec 28, 2009

Replies: 5

Views: 4K

Question about expanding universe VS gravity pull.

Dec 27, 2009 · Replies 3 · Dec 27, 2009

Replies: 3

Views: 3K

Are LMC, SMC approaching the Milky Way ?

Dec 27, 2009 · Replies 2 · Dec 27, 2009

Replies: 2

Views: 5K

Qualifying Radiation Detectors for Space: Homework Help Needed

Dec 26, 2009 · Replies 2 · Dec 27, 2009

Replies: 2

Views: 2K

Why does gravity cause lower orbit speed at smaller radii?

Dec 4, 2009 · Replies 18 · Dec 27, 2009

Replies: 18

Views: 8K

Death of Mars: How a Volcano Could Trigger Planetary Extinction

Dec 25, 2009 · Replies 2 · Dec 26, 2009

Replies: 2

Views: 2K

Calculating Kinetic Energy for Rotating Planets

Dec 26, 2009 · Replies 5 · Dec 26, 2009

Replies: 5

Views: 7K

Stargazing My New Telescope - Review and EP Advice

Dec 26, 2009 · Replies 1 · Dec 26, 2009

Replies: 1

Views: 2K

Is a Used Telescope a Good Choice for a Beginner Astronomer?

Dec 25, 2009 · Replies 5 · Dec 26, 2009

Replies: 5

Views: 3K

Why are blue-shifted galaxies concentrated in specific sky directions?

Oct 9, 2005 · Replies 19 · Dec 26, 2009

Replies: 19

Views: 16K

What is the true scope of our universe?

Nov 20, 2009 · Replies 5 · Dec 25, 2009

Replies: 5

Views: 3K

Mercury's Orbital Precession Anomaly

Dec 25, 2009 · Replies 1 · Dec 25, 2009

Replies: 1

Views: 3K

WR104 Gamma Ray Burst: Fact or Fiction?

Dec 24, 2009 · Replies 1 · Dec 25, 2009

Replies: 1

Views: 6K

Astronomers use earth-based spectroscopy

Dec 22, 2009 · Replies 4 · Dec 25, 2009

Replies: 4

Views: 3K

Is Nibiru Really Going to Collide with Earth in 2012?

Dec 25, 2008 · Replies 5 · Dec 25, 2009

Replies: 5

Views: 15K

Will the Moon escape Earth's orbit in billions of years?

Dec 21, 2009 · Replies 8 · Dec 24, 2009

Replies: 8

Views: 33K

How to Calculate the Scale of Venus's Atmosphere Using the Barometer Equation

Dec 22, 2009 · Replies 3 · Dec 23, 2009

Replies: 3

Views: 5K

Calculate Aphelion Distance & Velocity of Comet at Perihelion

Dec 22, 2009 · Replies 8 · Dec 23, 2009

Replies: 8

Views: 18K

What Is the Temperature Differential of Hawking Radiation?

Dec 18, 2009 · Replies 8 · Dec 23, 2009

Replies: 8

Views: 4K

Is There a Massive Time-Image Gap in Observing Distant Galaxies?

Dec 22, 2009 · Replies 2 · Dec 22, 2009

Replies: 2

Views: 2K

What Causes Pluto's Elliptical Orbit Around the Sun?

Dec 22, 2009 · Replies 3 · Dec 22, 2009

Replies: 3

Views: 3K

Are Quasars Still Present in Our Universe?

Dec 20, 2009 · Replies 3 · Dec 22, 2009

Replies: 3

Views: 6K

Cephid Variables: Finding Distance from Parallax & Magnitude

Dec 21, 2009 · Replies 4 · Dec 21, 2009

Replies: 4

Views: 2K

How do I calculate light years to years?

Dec 20, 2009 · Replies 5 · Dec 21, 2009

Replies: 5

Views: 40K

Transmission Bandwith though space

Dec 19, 2009 · Replies 5 · Dec 20, 2009

Replies: 5

Views: 2K

Trying to find out how exactly we find out how big the visible universe is.

Dec 19, 2009 · Replies 2 · Dec 19, 2009

Replies: 2

Views: 3K

Dark matter discoverd? link inside

Dec 18, 2009 · Replies 1 · Dec 19, 2009

Replies: 1

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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