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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.

Prefix: Undergrad

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Undergrad Relativity & Expansion of Universe: Einstein's Cosmological Constant

Jul 1, 2011 · Replies 1 · Jul 1, 2011

Replies: 1

Views: 2K

Undergrad Space Elevators and Other Alternatives

Mar 12, 2011 · Replies 71 · Jun 29, 2011

3

Replies: 71

Views: 11K

Undergrad Challenges of Terraforming Mars: Temperature, Air Pressure, and Radiation

Jun 16, 2011 · Replies 80 · Jun 28, 2011

3

Replies: 80

Views: 21K

Undergrad Describe some basic concepts for me please?

Jun 28, 2011 · Replies 2 · Jun 28, 2011

Replies: 2

Views: 3K

Undergrad How common is it for stars to have rocky bodies orbiting them?

Jun 24, 2011 · Replies 3 · Jun 26, 2011

Replies: 3

Views: 4K

Undergrad Need help understanding use of cepheid variables

Jun 25, 2011 · Replies 3 · Jun 26, 2011

Replies: 3

Views: 3K

Undergrad New Star Squirts Water From Poles

Jun 18, 2011 · Replies 5 · Jun 26, 2011

Replies: 5

Views: 5K

Undergrad Are blackholes formed in other ways besides supernovas?

Jun 13, 2011 · Replies 6 · Jun 25, 2011

Replies: 6

Views: 3K

Undergrad How do electrons and protons interact in atoms?

Jun 24, 2011 · Replies 13 · Jun 25, 2011

Replies: 13

Views: 17K

Undergrad Calculating RA and Dec from long/lat/time/alt/azm

Jun 15, 2011 · Replies 1 · Jun 24, 2011

Replies: 1

Views: 5K

Undergrad Question about the Moons formation.

Jun 21, 2011 · Replies 1 · Jun 21, 2011

Replies: 1

Views: 3K

Undergrad Can we explore white dwarfs with robotic missions?

Jun 19, 2011 · Replies 12 · Jun 21, 2011

Replies: 12

Views: 8K

Undergrad Star Swallowed by Galactic Black Hole

Jun 16, 2011 · Replies 4 · Jun 17, 2011

Replies: 4

Views: 4K

Undergrad How are Cepheids used to measure distances?

Jun 15, 2011 · Replies 5 · Jun 16, 2011

Replies: 5

Views: 5K

Undergrad Can we identify the generation of any star?

Jun 15, 2011 · Replies 1 · Jun 15, 2011

Replies: 1

Views: 3K

Undergrad How Do We Calculate the Gravity of Different Particles and Celestial Bodies?

May 15, 2011 · Replies 5 · Jun 15, 2011

Replies: 5

Views: 3K

Undergrad Stefans Boltzmann Law: Find Star Luminosity

Jun 9, 2011 · Replies 2 · Jun 15, 2011

Replies: 2

Views: 3K

Undergrad Temperature - Effect on atmospheric pressure.

Jun 12, 2011 · Replies 13 · Jun 14, 2011

Replies: 13

Views: 12K

Undergrad What is the significance of hour angle in astronomical observations?

Jun 13, 2011 · Replies 5 · Jun 14, 2011

Replies: 5

Views: 4K

Undergrad Are Black Holes Hot? A Deeper Look

Jun 14, 2011 · Replies 5 · Jun 14, 2011

Replies: 5

Views: 2K

Undergrad Planet orbital location database

Jun 12, 2011 · Replies 5 · Jun 13, 2011

Replies: 5

Views: 5K

Undergrad What happens when a second mars appears?

Jun 9, 2011 · Replies 4 · Jun 13, 2011

Replies: 4

Views: 4K

Undergrad Could the acceleration of expansion (of the universe) be an optical illusion?

Jun 8, 2011 · Replies 7 · Jun 10, 2011

Replies: 7

Views: 5K

Undergrad Planets - Effective Temperature vs Actual Temperature

Jun 9, 2011 · Replies 2 · Jun 9, 2011

Replies: 2

Views: 6K

Undergrad Can There Be a Stable Figure-Eight Orbit Between Earth and the Moon?

Jun 9, 2011 · Replies 1 · Jun 9, 2011

Replies: 1

Views: 3K

Undergrad Asteroids and the formation of planets

Jun 8, 2011 · Replies 3 · Jun 8, 2011

Replies: 3

Views: 5K

Undergrad How Does Time Dilation Affect Our Understanding of the Universe's Age?

Jun 8, 2011 · Replies 3 · Jun 8, 2011

Replies: 3

Views: 3K

Undergrad Perpetual Motion: Is Cosmos an Endless Machine?

Jun 3, 2004 · Replies 26 · Jun 6, 2011

Replies: 26

Views: 7K

Undergrad How long could it take for the Earth to be in the exact same place as it was?

May 25, 2011 · Replies 7 · Jun 3, 2011

Replies: 7

Views: 9K

Undergrad Emission line in spectrum of a sun

May 30, 2011 · Replies 1 · Jun 2, 2011

Replies: 1

Views: 3K

Undergrad Why does gravity make things spin?

Mar 28, 2007 · Replies 40 · May 30, 2011

2

Replies: 40

Views: 27K

Undergrad How to Calculate Angular Diameter of a Galaxy with a Given Diameter?

May 30, 2011 · Replies 2 · May 30, 2011

Replies: 2

Views: 3K

Undergrad What Data is Needed to Understand the Formation of Black Hole Jets?

Apr 18, 2011 · Replies 42 · May 29, 2011

2

Replies: 42

Views: 12K

Undergrad Star density, outside our galaxy

May 26, 2011 · Replies 11 · May 28, 2011

Replies: 11

Views: 5K

Undergrad Distribution of planets material

May 14, 2011 · Replies 10 · May 25, 2011

Replies: 10

Views: 3K

Undergrad Milky Way: Star & H-Atom Distribution

May 23, 2011 · Replies 1 · May 25, 2011

Replies: 1

Views: 2K

Undergrad Atmospheric Surface Pressure and Density

May 22, 2011 · Replies 1 · May 24, 2011

Replies: 1

Views: 3K

Undergrad Asteroid Density & Impact Rate - Earth vs Mars

May 23, 2011 · Replies 4 · May 24, 2011

Replies: 4

Views: 4K

Undergrad What is the binding energy needed to shatter Earth by asteroid impact?

May 24, 2011 · Replies 8 · May 24, 2011

Replies: 8

Views: 5K

Undergrad Simulation of formation of a solar system

May 24, 2011 · Replies 1 · May 24, 2011

Replies: 1

Views: 5K

Undergrad Determining the mass of globular cluster?

May 23, 2011 · Replies 3 · May 24, 2011

Replies: 3

Views: 7K

Undergrad Universe Today: What Does It Look Like?

May 23, 2011 · Replies 2 · May 23, 2011

Replies: 2

Views: 3K

Undergrad How Does Gravity Cause Acceleration Towards a Massive Object in Space?

May 22, 2011 · Replies 4 · May 22, 2011

Replies: 4

Views: 2K

Undergrad Relationship between mass and surface temperature of a star

May 5, 2011 · Replies 7 · May 22, 2011

Replies: 7

Views: 10K

Undergrad How Powerful Is a Supernova in Megatons?

May 16, 2011 · Replies 36 · May 22, 2011

2

Replies: 36

Views: 29K

Undergrad Estimating the radius of planets

May 20, 2011 · Replies 4 · May 21, 2011

Replies: 4

Views: 4K

Undergrad The Mystery of Jupiter's Gravity: How Can it Eject Asteroids?

May 20, 2011 · Replies 3 · May 21, 2011

Replies: 3

Views: 3K

Undergrad Planets with No Orbit: Fascinating News

May 18, 2011 · Replies 6 · May 21, 2011

Replies: 6

Views: 4K

Undergrad Server to query for sun/planets elevation at a given datetime?

May 18, 2011 · Replies 4 · May 21, 2011

Replies: 4

Views: 3K

Undergrad Find Direction Between 2 Points: A & B

May 20, 2011 · Replies 1 · May 20, 2011

Replies: 1

Views: 2K

Undergrad How Does Time Connect to Space in Our Universe?

May 20, 2011 · Replies 8 · May 20, 2011

Replies: 8

Views: 2K

Undergrad Could Rogue Planets be an Alternative to Dark Matter?

May 19, 2011 · Replies 3 · May 20, 2011

Replies: 3

Views: 6K

Undergrad Outer planets always gas planets?

Oct 21, 2004 · Replies 12 · May 19, 2011

Replies: 12

Views: 16K

Undergrad What is an equal-sun-elevation day called?

May 16, 2011 · Replies 15 · May 18, 2011

Replies: 15

Views: 5K

Undergrad What is the difference between the left and right pictures of a Quasar Core?

May 16, 2011 · Replies 4 · May 17, 2011

Replies: 4

Views: 3K

Undergrad Asteroid Impact Crater Size: Function of Diameter

May 15, 2011 · Replies 3 · May 16, 2011

Replies: 3

Views: 4K

Undergrad How Did Ancient Civilizations Accurately Predict Astronomical Events?

Sep 25, 2009 · Replies 4 · May 16, 2011

Replies: 4

Views: 3K

Undergrad Measuring time in the 17th century.

May 1, 2009 · Replies 24 · May 15, 2011

Replies: 24

Views: 7K

Undergrad What's the opposite of a blackhole?

May 13, 2011 · Replies 6 · May 15, 2011

Replies: 6

Views: 6K

Undergrad Calculating the size of planets from length of days.

May 14, 2011 · Replies 4 · May 15, 2011

Replies: 4

Views: 6K

Undergrad Is Faster-Than-Light Space Travel Possible with New Technology?

Jan 17, 2011 · Replies 18 · May 14, 2011

Replies: 18

Views: 6K

Undergrad Are Asteroids Outside Our Solar System and the Moon Affected by Impact Tsunamis?

May 11, 2011 · Replies 6 · May 14, 2011

Replies: 6

Views: 3K

Undergrad What are the consequences of pole reversals on Earth

May 11, 2011 · Replies 9 · May 14, 2011

Replies: 9

Views: 6K

Undergrad Gravity Revisited: Earth-Moon & Earth-Sun Comparisons

May 10, 2011 · Replies 35 · May 13, 2011

2

Replies: 35

Views: 4K

Undergrad What methods are used to CONFIRM the compisition of a star from spectral lines?

May 13, 2011 · Replies 1 · May 13, 2011

Replies: 1

Views: 2K

Undergrad Why the plane of the rings is vertical to the rotation axis of Saturn?

May 11, 2011 · Replies 11 · May 13, 2011

Replies: 11

Views: 7K

Undergrad Physics of a satellite orbiting the sun

Apr 29, 2011 · Replies 10 · May 11, 2011

Replies: 10

Views: 4K

Undergrad Elliptic orbit of earth round the sun

May 11, 2011 · Replies 1 · May 11, 2011

Replies: 1

Views: 4K

Undergrad [QUESTION]Dark energy could it be an explosion?

May 7, 2011 · Replies 5 · May 9, 2011

Replies: 5

Views: 3K

Undergrad Will the Moon's Recession from Earth Ever Cease?

May 8, 2011 · Replies 1 · May 8, 2011

Replies: 1

Views: 2K

Undergrad Can We See All Galaxies in the Universe?

Apr 12, 2011 · Replies 17 · May 6, 2011

Replies: 17

Views: 5K

Undergrad Question about the color of galaxies & nebulae

May 3, 2011 · Replies 19 · May 6, 2011

Replies: 19

Views: 11K

Undergrad Elliptical Orbit: Determine Foci & Missile Path

May 5, 2011 · Replies 2 · May 5, 2011

Replies: 2

Views: 2K

Undergrad The orbital eccentricity change of the Earth ?

May 2, 2011 · Replies 5 · May 4, 2011

Replies: 5

Views: 3K

Undergrad How can you discover new things in Astronomy without a PhD ?

Apr 27, 2011 · Replies 8 · Apr 29, 2011

Replies: 8

Views: 4K

Undergrad Acceleration in elliptical orbits ?

Apr 27, 2011 · Replies 3 · Apr 28, 2011

Replies: 3

Views: 5K

Undergrad Intro and a Question About Ellipticity

Apr 22, 2011 · Replies 3 · Apr 28, 2011

Replies: 3

Views: 3K

Undergrad Space Debris Removal: Where to Publish Idea?

Mar 13, 2011 · Replies 10 · Apr 27, 2011

Replies: 10

Views: 4K

Undergrad Does Traveling Through a Wormhole Violate the Law of Conservation of Mass?

Apr 26, 2011 · Replies 2 · Apr 27, 2011

Replies: 2

Views: 3K

Undergrad Is the Old Model of the Universe Still Valid?

Apr 20, 2011 · Replies 10 · Apr 26, 2011

Replies: 10

Views: 4K

Undergrad How Kepler derived that T^2 is proportional to r^3

Apr 25, 2011 · Replies 2 · Apr 25, 2011

Replies: 2

Views: 7K

Undergrad How Much Longer Does an Atomic Clock Run on the Moon Compared to Earth?

Apr 23, 2011 · Replies 3 · Apr 23, 2011

Replies: 3

Views: 4K

Undergrad Could a bullet shot from a spaceship orbiting Earth escape the planet?

Apr 21, 2011 · Replies 9 · Apr 23, 2011

Replies: 9

Views: 5K

Undergrad Why Do Physicists Consider Black Holes Something?

Apr 12, 2011 · Replies 7 · Apr 22, 2011

Replies: 7

Views: 4K

Undergrad Does Time have a mathematical equation or Law?

Apr 16, 2011 · Replies 9 · Apr 21, 2011

Replies: 9

Views: 6K

Undergrad Space Junk Removal: Is Laser Technology the Answer?

Apr 21, 2011 · Replies 3 · Apr 21, 2011

Replies: 3

Views: 2K

Undergrad How Does the Angle of Impact Affect the Depth of Meteorite Craters?

Apr 16, 2011 · Replies 5 · Apr 20, 2011

Replies: 5

Views: 5K

Undergrad The Doppler Effect: Near and Far Galaxies

Apr 18, 2011 · Replies 3 · Apr 18, 2011

Replies: 3

Views: 2K

Undergrad Calculating Mass-Kepler's 3rd Law

Apr 15, 2011 · Replies 1 · Apr 15, 2011

Replies: 1

Views: 3K

Undergrad Black Holes and Gravity: Answers to Your Questions

Apr 11, 2011 · Replies 22 · Apr 14, 2011

Replies: 22

Views: 5K

Undergrad Transition A produces light with a wavelength of 400 nm

Apr 2, 2011 · Replies 5 · Apr 13, 2011

Replies: 5

Views: 2K

Undergrad Using a straw in a space capsule

Apr 11, 2011 · Replies 4 · Apr 12, 2011

Replies: 4

Views: 6K

Undergrad Understand Phase-Space Density: Basics & Concepts

Apr 11, 2011 · Replies 1 · Apr 12, 2011

Replies: 1

Views: 12K

Undergrad Astrophysics Reading Suggestions for College Students

Apr 10, 2011 · Replies 2 · Apr 11, 2011

Replies: 2

Views: 2K

Undergrad Gravity and the Formation of Stars

Apr 7, 2011 · Replies 7 · Apr 10, 2011

Replies: 7

Views: 5K

Undergrad Pyramids = were they pointing at supernova?

Apr 7, 2011 · Replies 7 · Apr 7, 2011

Replies: 7

Views: 4K

Undergrad Uncovering the Mystery: The Science Behind White Light and the Sun's Spectrum

Mar 18, 2011 · Replies 15 · Apr 6, 2011

Replies: 15

Views: 7K

Undergrad After Supernova: What Happens Next?

Apr 3, 2011 · Replies 5 · Apr 6, 2011

Replies: 5

Views: 8K

Undergrad Could a life made of antimatter interact with a life made of matter?

Mar 15, 2011 · Replies 18 · Apr 4, 2011

Replies: 18

Views: 15K

Undergrad Cold Welding: Can Asteroids Fuse?

Mar 28, 2011 · Replies 6 · Mar 31, 2011

Replies: 6

Views: 12K

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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