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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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Interstellar Exocomets Density & Impact Probability

Jun 14, 2015 · Replies 5 · Jun 14, 2015

Replies: 5

Views: 2K

Star post-main sequence timescale

Jun 5, 2015 · Replies 4 · Jun 13, 2015

Replies: 4

Views: 2K

Is Stacking RAW Images the Key to High-Quality Astrophotography?

Jun 4, 2015 · Replies 3 · Jun 12, 2015

Replies: 3

Views: 2K

Venus Transit - What should be a simple problem

Jun 11, 2015 · Replies 6 · Jun 12, 2015

Replies: 6

Views: 2K

Need to exchange a helical focuser for a rack and pinion one

Jun 3, 2015 · Replies 5 · Jun 12, 2015

Replies: 5

Views: 2K

How large an area is that brightly illuminted patch from stars covering?

Jun 11, 2015 · Replies 17 · Jun 11, 2015

Replies: 17

Views: 3K

Could energy be extracted from spacetime expansion?

Jun 10, 2015 · Replies 1 · Jun 10, 2015

Replies: 1

Views: 1K

814 Ghostly Galaxies in the Coma Cluster

Jun 8, 2015 · Replies 1 · Jun 8, 2015

Replies: 1

Views: 2K

Will the Voyager Golden Records withstand the harshness of space?

Mar 3, 2015 · Replies 20 · Jun 7, 2015

Replies: 20

Views: 4K

White Dwarfs Catalogue - Find Mass & Radius Data

Jun 4, 2015 · Replies 5 · Jun 7, 2015

Replies: 5

Views: 3K

Hubble redshift and calculation of galactic rotation curves

Jun 6, 2015 · Replies 3 · Jun 6, 2015

Replies: 3

Views: 2K

Pluto's moon Nix and its wild tumbling orbit

Jun 4, 2015 · Replies 3 · Jun 5, 2015

Replies: 3

Views: 2K

Discover Earth's Plasma Rings | Cleo Loi Proves Existence of Plasma Tubes

Jun 5, 2015 · Replies 4 · Jun 5, 2015

Replies: 4

Views: 2K

Understanding Solar UV Radiation and Its Impact on Earth: A Brief Overview

Jun 4, 2015 · Replies 3 · Jun 4, 2015

Replies: 3

Views: 1K

Are Primordial Black Holes Still a Viable Candidate for Dark Matter?

Jun 2, 2015 · Replies 5 · Jun 3, 2015

Replies: 5

Views: 2K

Is it theoretically possible for a star to orbit a planet?

May 19, 2015 · Replies 17 · Jun 3, 2015

Replies: 17

Views: 4K

Stargazing Reflector telescope, what to do?

Apr 2, 2015 · Replies 11 · Jun 3, 2015

Replies: 11

Views: 6K

Is Deja Vu the Brain's misinterpretation of Spacetime?

Jun 3, 2015 · Replies 3 · Jun 3, 2015

Replies: 3

Views: 2K

Milky Way Mass: 60,000 Ly from Galactic Center

Jun 3, 2015 · Replies 3 · Jun 3, 2015

Replies: 3

Views: 2K

I just saw a fireball and nobody cares

May 3, 2015 · Replies 9 · Jun 2, 2015

Replies: 9

Views: 2K

Star Nuclear Reaction: P+P, D+P, He3 and CNO Cycle

Jun 2, 2015 · Replies 2 · Jun 2, 2015

Replies: 2

Views: 2K

Sky temperature profiles and black body radiation

Jun 1, 2015 · Replies 1 · Jun 2, 2015

Replies: 1

Views: 1K

Did a Giant Impact Make the Martian Moons?

May 19, 2015 · Replies 2 · Jun 1, 2015

Replies: 2

Views: 2K

Is There Evidence of a Type Ia Supernova Formed via the Single Degenerate Mode?

May 21, 2015 · Replies 1 · May 31, 2015

Replies: 1

Views: 1K

Is the Density of Points in an Interval Twice as Much with Double Length?

May 30, 2015 · Replies 7 · May 31, 2015

Replies: 7

Views: 2K

Understanding the Units of Permittivity of Free Space in Coulomb's Law

May 29, 2015 · Replies 4 · May 30, 2015

Replies: 4

Views: 2K

Are Asteroids Formed by Collisions or Accretion?

May 28, 2015 · Replies 4 · May 30, 2015

Replies: 4

Views: 2K

CMB photons, why are they still around?

May 25, 2015 · Replies 15 · May 29, 2015

Replies: 15

Views: 3K

Where do things go after they were sucked by a Blackhole?

May 21, 2015 · Replies 57 · May 28, 2015

2

Replies: 57

Views: 7K

Micrometeorite caught on camera in Oklahoma?

May 27, 2015 · Replies 3 · May 28, 2015

Replies: 3

Views: 1K

Sagittarius A*: the riddle of gas cloud G2

May 23, 2015 · Replies 9 · May 28, 2015

Replies: 9

Views: 3K

Ceres/Mars as manufacturing outposts (analytic exercise)

May 11, 2015 · Replies 32 · May 28, 2015

2

Replies: 32

Views: 4K

Is This Picture Really About the CNO Cycle?

May 28, 2015 · Replies 4 · May 28, 2015

Replies: 4

Views: 2K

Can You Spot All the Galaxies in This Virgo Supercluster Photo?

May 8, 2015 · Replies 8 · May 27, 2015

Replies: 8

Views: 2K

Trajectory opimization: Fast preview algorithm

May 5, 2015 · Replies 1 · May 27, 2015

Replies: 1

Views: 1K

Other evidences of the Galaxys' Acceleration

May 27, 2015 · Replies 1 · May 27, 2015

Replies: 1

Views: 1K

Question about Kepler's 1st law and barycentric orbits

May 27, 2015 · Replies 1 · May 27, 2015

Replies: 1

Views: 2K

Can We Harness Black Holes for Faster Flybys?

May 25, 2015 · Replies 2 · May 27, 2015

Replies: 2

Views: 1K

Four random quasars in a straight line?

May 15, 2015 · Replies 6 · May 27, 2015

Replies: 6

Views: 2K

When can globular clusters be considered collisionless?

May 26, 2015 · Replies 4 · May 27, 2015

Replies: 4

Views: 1K

Can you have an antimatter black hole?

May 8, 2015 · Replies 18 · May 26, 2015

Replies: 18

Views: 4K

A&C Reference Library - Astronomy & Cosmology Resources

Jan 26, 2004 · Replies 144 · May 26, 2015

5

Replies: 144

Views: 135K

Are Galaxies in Hubble Telescope Photos of Clusters?

May 25, 2015 · Replies 2 · May 26, 2015

Replies: 2

Views: 2K

Center of mass - cant find error in derivation

May 24, 2015 · Replies 13 · May 24, 2015

Replies: 13

Views: 3K

Questions on the Lyman Alpha Profile

Apr 29, 2015 · Replies 33 · May 24, 2015

2

Replies: 33

Views: 7K

Can light pressure affect the motion of galaxies?

May 21, 2015 · Replies 3 · May 23, 2015

Replies: 3

Views: 2K

Calculating an Escape from Earth's Gravity: Can It Be Done?

May 20, 2015 · Replies 4 · May 22, 2015

Replies: 4

Views: 2K

Proof that the moon is closer to Earth than the sun

May 1, 2015 · Replies 33 · May 20, 2015

2

Replies: 33

Views: 11K

Could you send an object into space completely without fuel?

May 13, 2015 · Replies 18 · May 20, 2015

Replies: 18

Views: 2K

Discover the Fascinating Rotations of the Moon | Gibraltar to Auckland Views

May 19, 2015 · Replies 17 · May 20, 2015

Replies: 17

Views: 9K

Question about gravitational waves, E modes

May 16, 2015 · Replies 1 · May 16, 2015

Replies: 1

Views: 1K

General differential equation solution for Kepler Problem

May 11, 2015 · Replies 4 · May 16, 2015

Replies: 4

Views: 2K

How do galaxies die? Contradictions between two papers

May 15, 2015 · Replies 1 · May 16, 2015

Replies: 1

Views: 1K

Question on Comet 67P tail in Rosetta image

May 1, 2015 · Replies 12 · May 15, 2015

Replies: 12

Views: 2K

Distance Comparison: Converting 48 Distance Modulus to Meters

May 12, 2015 · Replies 27 · May 15, 2015

Replies: 27

Views: 4K

Confirmation on the Effect of Solar Irradiance

May 14, 2015 · Replies 7 · May 15, 2015

Replies: 7

Views: 2K

Lyman Series Wavelengths - measurement standard?

May 15, 2015 · Replies 0 · May 15, 2015

Replies: 0

Views: 2K

M31 halo paper - question on metallicity

May 10, 2015 · Replies 1 · May 14, 2015

Replies: 1

Views: 1K

Compatibility of General Relativity with SO(3)

May 13, 2015 · Replies 3 · May 13, 2015

Replies: 3

Views: 1K

In Need of Some (Measurable) Illumination

May 9, 2015 · Replies 10 · May 13, 2015

Replies: 10

Views: 2K

If space is curved, could it be detected

May 1, 2015 · Replies 26 · May 13, 2015

Replies: 26

Views: 4K

Is the mass of the universe finite (collection of objects)?

Apr 30, 2015 · Replies 53 · May 12, 2015

2

Replies: 53

Views: 7K

Does Relativity Alter Our Perception of Galaxies?

May 11, 2015 · Replies 5 · May 12, 2015

Replies: 5

Views: 2K

What will happen if our sun color blue?

Apr 21, 2015 · Replies 15 · May 11, 2015

Replies: 15

Views: 5K

Radio astronomical receiving system

May 10, 2015 · Replies 5 · May 11, 2015

Replies: 5

Views: 1K

How can I know if two stars came from the same cluster?

May 8, 2015 · Replies 4 · May 11, 2015

Replies: 4

Views: 2K

Measuring Gravitational Redshift due to Galaxies without GR

May 9, 2015 · Replies 4 · May 10, 2015

Replies: 4

Views: 2K

How Far Can We Detect Faint Celestial Objects Near Our Solar System?

May 6, 2015 · Replies 6 · May 10, 2015

Replies: 6

Views: 2K

Find Radial Velocity of Galaxies

May 9, 2015 · Replies 3 · May 9, 2015

Replies: 3

Views: 2K

What if expansion rate of a universe is the speed of light?

May 8, 2015 · Replies 8 · May 9, 2015

Replies: 8

Views: 2K

Stargazing Can I Make My Own 8 Telescope with These Required Instruments?

May 8, 2015 · Replies 2 · May 8, 2015

Replies: 2

Views: 1K

If the universe has a spin, was it causing the similar

May 8, 2015 · Replies 1 · May 8, 2015

Replies: 1

Views: 2K

Calculating Star and Planet Positions in the Night Sky: A Mathematical Approach

May 8, 2015 · Replies 5 · May 8, 2015

Replies: 5

Views: 2K

Is the expansion of the universe similar to an explosion?

May 5, 2015 · Replies 10 · May 7, 2015

Replies: 10

Views: 2K

How much energy radiates from Jupiter?

May 6, 2015 · Replies 4 · May 7, 2015

Replies: 4

Views: 2K

Gravity moving toward the center of the Sun?

Jun 21, 2013 · Replies 20 · May 6, 2015

Replies: 20

Views: 11K

Is there any physicists i could email?

May 5, 2015 · Replies 2 · May 5, 2015

Replies: 2

Views: 1K

Gamow peak and nuclear reaction rate

May 4, 2015 · Replies 2 · May 5, 2015

Replies: 2

Views: 3K

What Would Happen if I Threw My Watch into a Black Hole?

Apr 15, 2015 · Replies 10 · May 5, 2015

Replies: 10

Views: 2K

Would a supermassive black hole explode?

May 4, 2015 · Replies 5 · May 4, 2015

Replies: 5

Views: 2K

Stargazing Problem in making a small refracting Telescope

May 1, 2015 · Replies 3 · May 4, 2015

Replies: 3

Views: 4K

Is Dark matter an optical illusion?

May 4, 2015 · Replies 1 · May 4, 2015

Replies: 1

Views: 2K

Are there any "Polar" solar system structures?

May 3, 2015 · Replies 10 · May 3, 2015

Replies: 10

Views: 2K

Calculating the event horizon of black holes.

May 3, 2015 · Replies 5 · May 3, 2015

Replies: 5

Views: 3K

Redshift, Earth's orbital speed, and the speed of light

May 3, 2015 · Replies 1 · May 3, 2015

Replies: 1

Views: 2K

Stargazing Why is there no Hubble-like telescope on the International Space Station?

Apr 3, 2015 · Replies 6 · May 3, 2015

Replies: 6

Views: 3K

Predicting angle of deflection of light

May 2, 2015 · Replies 7 · May 3, 2015

Replies: 7

Views: 2K

Loss of mass of an object falling through air

Apr 29, 2015 · Replies 8 · May 2, 2015

Replies: 8

Views: 2K

Conservation of momentum of collision

May 2, 2015 · Replies 2 · May 2, 2015

Replies: 2

Views: 1K

New Horizons Sees First Features on Pluto

May 1, 2015 · Replies 13 · May 1, 2015

Replies: 13

Views: 3K

Can NASA's Impossible EM Drive Revolutionize Space Travel?

May 1, 2015 · Replies 2 · May 1, 2015

Replies: 2

Views: 1K

Mass of a galaxy without dark matter and with dark matter

Apr 25, 2015 · Replies 37 · May 1, 2015

2

Replies: 37

Views: 5K

Can you see the atmosphere with you eyes or only through photos? (In space)

Apr 22, 2015 · Replies 6 · May 1, 2015

Replies: 6

Views: 4K

Which laptop operating system do astronomers most often use?

Apr 29, 2015 · Replies 2 · Apr 30, 2015

Replies: 2

Views: 4K

Complex organic molecules discovered in protoplanetary disk

Apr 12, 2015 · Replies 5 · Apr 29, 2015

Replies: 5

Views: 3K

Supernova | Rogue Neutron Star Formation

Apr 28, 2015 · Replies 5 · Apr 29, 2015

Replies: 5

Views: 3K

Looking for the complete fusion process inside our Sun.

Apr 29, 2015 · Replies 2 · Apr 29, 2015

Replies: 2

Views: 1K

Dark Matter is baryonic matter passed through a black hole?

Apr 28, 2015 · Replies 3 · Apr 28, 2015

Replies: 3

Views: 1K

Can a Black Hole Form Directly from a Collapsing Protostar Cloud?

Nov 20, 2014 · Replies 19 · Apr 28, 2015

Replies: 19

Views: 3K

Globular cluster luminosity function

Apr 22, 2015 · Replies 3 · Apr 28, 2015

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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