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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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What's there to see in the night sky at this time of year?

Jun 26, 2003 · Replies 11 · Jul 1, 2003

Replies: 11

Views: 4K

Graduate Solving the Mysteries of Galaxies

Jun 21, 2003 · Replies 9 · Jun 30, 2003

Replies: 9

Views: 4K

Undergrad Calculating Galaxy Coordinates to Avoid Star Misplacement

Jun 17, 2003 · Replies 27 · Jun 30, 2003

Replies: 27

Views: 6K

Phobos is an Exceptionally Dark Object in the Solar System

Jun 26, 2003 · Replies 9 · Jun 29, 2003

Replies: 9

Views: 4K

High School What Are the Latest and Upcoming Missions to the Outer Planets?

Jun 28, 2003 · Replies 2 · Jun 28, 2003

Replies: 2

Views: 3K

Graduate Second black hole may lurk at Milky Way's heart

Jun 23, 2003 · Replies 1 · Jun 27, 2003

Replies: 1

Views: 3K

Graduate So, what is the right question to ask about this topic?

Jun 25, 2003 · Replies 6 · Jun 27, 2003

Replies: 6

Views: 3K

High School Moon-Earth Position: Apollo 8 Photo Examined

Jun 23, 2003 · Replies 7 · Jun 27, 2003

Replies: 7

Views: 3K

Graduate The Direction of Space: Is Light Traveling Around the Periphery?

Jun 12, 2003 · Replies 47 · Jun 26, 2003

2

Replies: 47

Views: 10K

Graduate Could Sub-Universes Exist Within an Infinite Multiverse?

Jun 22, 2003 · Replies 6 · Jun 25, 2003

Replies: 6

Views: 6K

Graduate Is the Universe Shaped Like a Three-Torus?

Jun 25, 2003 · Replies 2 · Jun 25, 2003

Replies: 2

Views: 6K

If everything was increased in size equally, would it matter?

May 22, 2003 · Replies 12 · Jun 25, 2003

Replies: 12

Views: 4K

Graduate Age of a Distant Galaxy: Is It Double?

Jun 23, 2003 · Replies 3 · Jun 25, 2003

Replies: 3

Views: 4K

Undergrad Big Bang vs White Hole: The Truth Revealed

Jun 24, 2003 · Replies 3 · Jun 24, 2003

Replies: 3

Views: 4K

Graduate 96 percent of cosmos puzzles astronomers

Jun 24, 2003 · Replies 3 · Jun 24, 2003

Replies: 3

Views: 4K

Graduate How Does Gravity Affect Light?

Jun 22, 2003 · Replies 1 · Jun 22, 2003

Replies: 1

Views: 5K

Graduate Are There Viable Alternatives to Dark Matter in Explaining Galactic Motion?

Jun 21, 2003 · Replies 3 · Jun 22, 2003

Replies: 3

Views: 3K

Graduate What are Stephen Hawking's Calculations on the Eternity of the Universe?

Jun 19, 2003 · Replies 4 · Jun 21, 2003

Replies: 4

Views: 7K

Undergrad Understand Doppler Effect: Hubble & Stars Moving Away

Jun 21, 2003 · Replies 5 · Jun 21, 2003

Replies: 5

Views: 4K

Graduate Strange star puzzles astronomers: BBC

Jun 18, 2003 · Replies 4 · Jun 21, 2003

Replies: 4

Views: 4K

High School Absolute zero for the boomerang nebula?

Jun 20, 2003 · Replies 4 · Jun 21, 2003

Replies: 4

Views: 4K

High School Is the Sun More Spherical or Oval? Investigating the Shape of Our Closest Star

Jun 18, 2003 · Replies 4 · Jun 20, 2003

Replies: 4

Views: 11K

Graduate Will Earth's Moon Follow Other Moons into a Ring System?

Jun 19, 2003 · Replies 7 · Jun 20, 2003

Replies: 7

Views: 5K

Mars Closest to Earth: Latest News & Mission Plans

Jun 15, 2003 · Replies 5 · Jun 18, 2003

Replies: 5

Views: 6K

High School A question of Planetary formation.

Jun 12, 2003 · Replies 14 · Jun 18, 2003

Replies: 14

Views: 4K

Undergrad Dark Matter: What Is It & How Will It Change Astronomy?

Jun 11, 2003 · Replies 15 · Jun 17, 2003

Replies: 15

Views: 5K

High School Slowing Down a Telescope: Showercaps, Endcaps & Dustcovers

Jun 15, 2003 · Replies 2 · Jun 15, 2003

Replies: 2

Views: 3K

Graduate Does nonbaryonic dark matter exist?

Jun 13, 2003 · Replies 1 · Jun 14, 2003

Replies: 1

Views: 4K

Stargazing Need advice/opinions on a telescope

Jun 7, 2003 · Replies 9 · Jun 13, 2003

Replies: 9

Views: 4K

High School Source of Energy for the Rotation of Earth

May 16, 2003 · Replies 11 · Jun 13, 2003

Replies: 11

Views: 7K

Graduate Universe can surf the Big Rip; Nature article

Jun 12, 2003 · Replies 1 · Jun 12, 2003

Replies: 1

Views: 3K

Undergrad The Moon's Impact on Earth: What Happens Without It?

Jun 10, 2003 · Replies 10 · Jun 11, 2003

Replies: 10

Views: 4K

Bad astronomy spurs good laughter

Jun 9, 2003 · Replies 3 · Jun 10, 2003

Replies: 3

Views: 8K

Graduate Solving Hubble Constant with rhocrit and Cosmological Constant

Jun 8, 2003 · Replies 15 · Jun 9, 2003

Replies: 15

Views: 5K

Poll

Graduate Fact or Fiction? Cosmology Statements

May 29, 2003 · Replies 2 · Jun 9, 2003

Replies: 2

Views: 6K

Is Earth Alone in a Universe Full of Stars?

Jun 5, 2003 · Replies 11 · Jun 9, 2003

Replies: 11

Views: 4K

What Are the Big Changes on Mars?

Jun 8, 2003 · Replies 1 · Jun 9, 2003

Replies: 1

Views: 3K

Graduate Is the Expansion of Space Truly Universal?

Jun 6, 2003 · Replies 9 · Jun 9, 2003

Replies: 9

Views: 4K

Poll

Graduate What is the current radius of the observable universe?

May 15, 2003 · Replies 33 · Jun 7, 2003

2

Replies: 33

Views: 13K

Graduate Light Years And Expanding Universe

Jun 7, 2003 · Replies 3 · Jun 7, 2003

Replies: 3

Views: 4K

Graduate Iron Fusion in Stars: Uncovering the Mysteries of Heavy Elements on Earth

Jun 7, 2003 · Replies 5 · Jun 7, 2003

Replies: 5

Views: 8K

Did Carl Sagan Lobby for This Iconic Image of Earth from Mars Orbit?

May 23, 2003 · Replies 6 · Jun 7, 2003

Replies: 6

Views: 6K

Undergrad Information request about Galaxies

Jun 5, 2003 · Replies 4 · Jun 6, 2003

Replies: 4

Views: 3K

High School Discover the Speed of Our Solar System

Jun 4, 2003 · Replies 9 · Jun 6, 2003

Replies: 9

Views: 6K

Has the Universe Slowed Its Expansion?

May 28, 2003 · Replies 2 · Jun 5, 2003

Replies: 2

Views: 3K

Graduate Understanding the Sun's Gravity and Its Impact on Planetary Orbits

May 2, 2003 · Replies 35 · Jun 5, 2003

2

Replies: 35

Views: 33K

Graduate Notion of matter, space and time

May 28, 2003 · Replies 67 · Jun 4, 2003

3

Replies: 67

Views: 9K

Graduate Estimating Critical Mass for Expansion

Jun 2, 2003 · Replies 4 · Jun 3, 2003

Replies: 4

Views: 4K

Graduate Space Genetics: A Weird Physics Theory on Mass, Radiation, and the Universe

May 29, 2003 · Replies 6 · Jun 3, 2003

Replies: 6

Views: 4K

Undergrad What Caused Uranus' Unique Rotation?

Jun 1, 2003 · Replies 2 · Jun 2, 2003

Replies: 2

Views: 4K

Stargazing Best Telescope Recommendations for City Viewing Near NYC

May 20, 2003 · Replies 21 · Jun 1, 2003

Replies: 21

Views: 6K

Poll

Graduate Which is the metric of the Universe?

May 30, 2003 · Replies 12 · Jun 1, 2003

Replies: 12

Views: 4K

Undergrad What is the density in atoms per unit volume of most nebulas?

May 30, 2003 · Replies 1 · Jun 1, 2003

Replies: 1

Views: 3K

High School Tevatron Explained: Emmy Noether's Mass Page

May 30, 2003 · Replies 4 · May 30, 2003

Replies: 4

Views: 3K

Poll

Undergrad What's your estimate of the other Drake equation?

May 25, 2003 · Replies 12 · May 29, 2003

Replies: 12

Views: 4K

High School Earth from Mars: Why is it Blurry? | CNN Exclusive

May 23, 2003 · Replies 3 · May 27, 2003

Replies: 3

Views: 4K

Vipers amazing theroy on life in the universe

May 26, 2003 · Replies 5 · May 27, 2003

Replies: 5

Views: 3K

What is the name of the Milky Way's satellite galaxy?

May 26, 2003 · Replies 1 · May 27, 2003

Replies: 1

Views: 4K

Graduate Local Group Direction & Solar System CMB Motion

May 23, 2003 · Replies 2 · May 26, 2003

Replies: 2

Views: 4K

Graduate How does this oscillating electromagnetic field keep its information?

May 25, 2003 · Replies 13 · May 26, 2003

Replies: 13

Views: 4K

Graduate Gravity & Vacuum in General Relativity: Is Space Flat?

May 23, 2003 · Replies 10 · May 26, 2003

Replies: 10

Views: 5K

Graduate Space: Is it a place? Or is it a physical entity?

May 24, 2003 · Replies 20 · May 26, 2003

Replies: 20

Views: 11K

High School How does the rotation of the earth around the axis bring about changes

May 26, 2003 · Replies 3 · May 26, 2003

Replies: 3

Views: 4K

Poll

What is your guess at Drake's answer?

May 25, 2003 · Replies 5 · May 25, 2003

Replies: 5

Views: 3K

High School Are There Stars Primarily Composed of Helium?

May 24, 2003 · Replies 3 · May 24, 2003

Replies: 3

Views: 3K

Graduate 3pi/Lambda = area of cosmological horizon

May 24, 2003 · Replies 1 · May 24, 2003

Replies: 1

Views: 4K

Graduate Cosmological redshift: how much energy has gone missing?

May 12, 2003 · Replies 37 · May 24, 2003

2

Replies: 37

Views: 9K

Graduate Lee Smolin predicted dark energy back in 1995

May 24, 2003 · Replies 2 · May 24, 2003

Replies: 2

Views: 3K

High School Star Birth: Process & Gravity Effects

May 20, 2003 · Replies 3 · May 23, 2003

Replies: 3

Views: 4K

Graduate A toolkit for working with natural units

May 19, 2003 · Replies 18 · May 22, 2003

Replies: 18

Views: 7K

Graduate One theory is that the higgs particle gives matter mass

Apr 26, 2003 · Replies 8 · May 22, 2003

Replies: 8

Views: 4K

Graduate What are the galactic coordinates of the Cosmic Microwave Background hotspot?

May 22, 2003 · Replies 1 · May 22, 2003

Replies: 1

Views: 3K

Graduate How long before the sun goes red giant?

May 19, 2003 · Replies 10 · May 22, 2003

Replies: 10

Views: 13K

Graduate What is the quantitative understanding of Hawking radiation from a black hole?

May 16, 2003 · Replies 27 · May 21, 2003

Replies: 27

Views: 6K

Poll

Graduate What prevents black hole singularities from being reached?

May 20, 2003 · Replies 6 · May 20, 2003

Replies: 6

Views: 3K

Graduate Understanding Rho Crit: The Critical Density of the Universe

May 17, 2003 · Replies 3 · May 20, 2003

Replies: 3

Views: 6K

Poll

Graduate What is the critical density of the universe?

May 16, 2003 · Replies 12 · May 20, 2003

Replies: 12

Views: 40K

Graduate SauwIs the concept of finite space in infinite time scientifically valid?

May 8, 2003 · Replies 56 · May 19, 2003

2

Replies: 56

Views: 14K

Undergrad Are fundamental physical laws dependent on our choice of units of measurement?

May 11, 2003 · Replies 25 · May 19, 2003

Replies: 25

Views: 6K

Graduate Are There Explanations for Solar Neutrino Anomalies and Hot Jupiters?

May 15, 2003 · Replies 9 · May 18, 2003

Replies: 9

Views: 4K

Stargazing Effects of a massive object on light and its relation to the 1919 Eclipse

May 18, 2003 · Replies 4 · May 18, 2003

Replies: 4

Views: 3K

Undergrad Astronomer107 and the surface gravity of a black hole

May 18, 2003 · Replies 1 · May 18, 2003

Replies: 1

Views: 7K

Graduate What's your favorite brief survey of modern cosmology?

May 18, 2003 · Replies 1 · May 18, 2003

Replies: 1

Views: 3K

Stargazing Check Out the Lunar Eclipse Tonight - Night Calculator

May 15, 2003 · Replies 5 · May 18, 2003

Replies: 5

Views: 4K

Graduate Question re GP-3 orbiting gyroscopes test of relativity

May 13, 2003 · Replies 2 · May 18, 2003

Replies: 2

Views: 3K

Graduate Z/A in the Chandrasekhar formula

May 17, 2003 · Replies 1 · May 17, 2003

Replies: 1

Views: 4K

Graduate What Are the Mysteries Behind Gravity and Its Theoretical Perspectives?

May 17, 2003 · Replies 3 · May 17, 2003

Replies: 3

Views: 3K

Undergrad Direct Observation: Finding Earth-Sized Exoplanets and Their Habitability

May 13, 2003 · Replies 11 · May 17, 2003

Replies: 11

Views: 3K

Graduate Early planetary formation thought

May 17, 2003 · Replies 1 · May 17, 2003

Replies: 1

Views: 3K

Graduate Is Photon Energy Lost or Conserved in Cosmological Redshift?

May 11, 2003 · Replies 25 · May 17, 2003

Replies: 25

Views: 7K

Graduate What Secrets Do Solar Rings and Shadow Matter Hold?

May 11, 2003 · Replies 1 · May 16, 2003

Replies: 1

Views: 4K

Poll

Graduate The Hawking wattage of a black hole

May 15, 2003 · Replies 2 · May 16, 2003

Replies: 2

Views: 3K

Graduate The principle of least action/time, and geodesics of spacetime

May 1, 2003 · Replies 56 · May 15, 2003

2

Replies: 56

Views: 12K

Poll

Was the first moon landing a fake?

May 12, 2003 · Replies 13 · May 15, 2003

Replies: 13

Views: 7K

Graduate Radius of cosmological mass-energy symmetry?

May 7, 2003 · Replies 8 · May 13, 2003

Replies: 8

Views: 4K

Graduate Can the Infinite Time Theory Be Refuted in Cosmology?

May 8, 2003 · Replies 25 · May 13, 2003

Replies: 25

Views: 7K

Graduate What happened before the Big Bang?

May 5, 2003 · Replies 33 · May 13, 2003

2

Replies: 33

Views: 8K

High School This seems kind of weird, but is there really no such thing as gravity in

May 5, 2003 · Replies 23 · May 13, 2003

Replies: 23

Views: 6K

Undergrad Photon structure - light decyphering

May 10, 2003 · Replies 8 · May 12, 2003

Replies: 8

Views: 4K

Undergrad Unveiling the Mystery of Comet Tails: The Role of Drag Factor

May 12, 2003 · Replies 1 · May 12, 2003

Replies: 1

Views: 3K

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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