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All fields Software Mathematics Physics Chemistry Biology Engineering Astronomy Environmental Other Astronomy Astronomy groups

Explore STEM Content

Search the community's STEM library — free to study, yours to make your own.

Astronomy

Stars, orbits, cosmology and observation on openstem — flashcards, notes, quizzes and plots shared by the community. Study free, or clone anything into your library.

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Astronomy: explore STEM content (page 8 of 26) · openstem

Note~235 words · 1 min

Mass Bends Light General relativity describes gravity not as a force acting at a distance but as the curvature of spacetime caused by mass and energy. Light travels along that curved spacetime, so its path visibly bends as it passes a massi

Astronomy

Astronomy · L3 · Gravitational Lensing

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Astronomy · L3 · Gravitational Lensing

Flashcards8 cards

What is a constellation?1 / 8

A group of stars that seems to form a picture or shape in the sky.

Astronomy

Astronomy · L1 · Stars and Constellations

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Astronomy · L1 · Stars and Constellations

Flowchart9 objects

Astronomy

Astronomy · L2 · The Milky Way and Other Galaxies · flowchart

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Astronomy · L2 · The Milky Way and Other Galaxies · flowchart

Flowchart21 objects

Astronomy

Astronomy · L3 · Stellar Evolution by Initial Mass

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Astronomy · L3 · Stellar Evolution by Initial Mass

Quiz4 questions

What is an exoplanet?

AA moon of a planet in our solar systemBA planet orbiting a star other than the SunCA planet with no star at allDAny object beyond Neptune

Astronomy

Astronomy · L2 · Exoplanets

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Astronomy · L2 · Exoplanets

Quiz4 questions

Why must radio telescope dishes usually be much larger than optical telescope mirrors?

ARadio waves are dimmer than visible lightBRadio wavelengths are much longer, requiring more collecting area for resolution and sensitivityCRadio telescopes only work at nightDRadio waves travel slower than visible light

Astronomy

Astronomy · L2 · Radio Astronomy Basics

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Astronomy · L2 · Radio Astronomy Basics

Flowchart15 objects

Astronomy

Astronomy · L5 · From Viscous Accretion to the Eddington Limit

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Astronomy · L5 · From Viscous Accretion to the Eddington Limit

Collection4 items

01Astronomy · L1 · The Four Seasons

02Astronomy · L1 · The Four Seasons

03Astronomy · L1 · The Order of the Seasons

+1 more

Astronomy

Astronomy · L1 · The Four Seasons

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Astronomy · L1 · The Four Seasons

Note~395 words · 2 min

Acoustic Oscillations Before Recombination Prior to recombination (z ≈ 1100), photons and baryons were tightly coupled into a single fluid by Thomson scattering. Gravitational potential wells sourced mainly by dark matter compressed this fl

Astronomy

Astronomy · L5 · The CMB Angular Power Spectrum and Cosmological Parameters

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Astronomy · L5 · The CMB Angular Power Spectrum and Cosmological Parameters

Flowchart9 objects

Astronomy

Astronomy · L2 · Radio Astronomy Basics · flowchart

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Astronomy · L2 · Radio Astronomy Basics · flowchart

Flowchart9 objects

Astronomy

Astronomy · L3 · Star Clusters & Stellar Populations · flowchart

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Astronomy · L3 · Star Clusters & Stellar Populations · flowchart

Collection3 items

01Astronomy · L5 · Magnetar Physics

02Astronomy · L5 · Magnetars: Extreme Fields, Giant Flares, and the Fast Radio Burst Connection

03Astronomy · L5 · Magnetar Physics

Astronomy

Astronomy · L5 · Magnetar Physics

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Astronomy · L5 · Magnetar Physics

Quiz5 questions

What is the Milky Way?

AA single bright starBOur home galaxyCA cometDA cloud in Earth's atmosphere

Astronomy

Astronomy · L1 · Spotting the Milky Way Quiz

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Astronomy · L1 · Spotting the Milky Way Quiz

Flowchart12 objects

Astronomy

Astronomy · L4 · From decades of astrometry to a supermassive black hole

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Astronomy · L4 · From decades of astrometry to a supermassive black hole

Flowchart13 objects

Astronomy

Astronomy · L5 · Large-Scale Structure: The Two-Point Correlation Function and the Cosmic Web · flowchart

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Astronomy · L5 · Large-Scale Structure: The Two-Point Correlation Function and the Cosmic Web · flowchart

Note~461 words · 2 min

Beyond Iron: Why Fusion Stops Iron-56 sits at the peak of the nuclear binding-energy-per-nucleon curve. Fusion releases energy building nuclei up to iron, but building anything heavier by fusion would require a net input of energy rather th

Astronomy

Astronomy · L5 · Neutron-Capture Nucleosynthesis: the s-process and r-process

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Astronomy · L5 · Neutron-Capture Nucleosynthesis: the s-process and r-process

Flashcards8 cards

Where are stars born?1 / 8

Inside giant clouds of gas and dust called nebulae, where gravity pulls material together.

Astronomy

Astronomy · L2 · The Life Cycle of Stars

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Astronomy · L2 · The Life Cycle of Stars

Flowchart13 objects

Astronomy

Astronomy · L5 · Baryogenesis and the Sakharov Conditions · flowchart

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Astronomy · L5 · Baryogenesis and the Sakharov Conditions · flowchart

Flowchart9 objects

Astronomy

Astronomy · L2 · Near-Earth Objects and Impact Risk · flowchart

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Astronomy · L2 · Near-Earth Objects and Impact Risk · flowchart

Note~463 words · 2 min

Blackbody radiation and the luminosity-radius-temperature relation Almost everything astronomers know about a star's physical size, energy output, and surface conditions comes from treating its light as blackbody radiation — thermal emissio

Astronomy

Astronomy · L4 · Blackbody radiation: Stefan-Boltzmann, Wien's law, and stellar L-R-T

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Astronomy · L4 · Blackbody radiation: Stefan-Boltzmann, Wien's law, and stellar L-R-T

Flashcards8 cards

What is an open cluster?1 / 8

A loosely bound group of a few hundred to a few thousand stars, formed together from the same giant molecular cloud, found in the disk of the galaxy — for example, the Pleiades.

Astronomy

Astronomy · L3 · Star Clusters & Stellar Populations

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Astronomy · L3 · Star Clusters & Stellar Populations

Flowchart9 objects

Astronomy

Astronomy · L3 · Dark Matter & Dark Energy · flowchart

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Astronomy · L3 · Dark Matter & Dark Energy · flowchart

Quiz5 questions

Why are star clusters especially useful for testing stellar evolution theory?

ABecause every star in them is identicalBBecause all their stars share almost the same age and starting composition, differing mainly in massCBecause they contain no massive starsDBecause they never change over time

Astronomy

Astronomy · L3 · Star Clusters & Stellar Populations

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Astronomy · L3 · Star Clusters & Stellar Populations

Flashcards8 cards

Write the Schwarzschild metric and identify its terms.1 / 8

The Schwarzschild solution describes spacetime around a static, spherically symmetric, uncharged mass M:

Astronomy

Astronomy · L5 · Schwarzschild Black Holes

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Astronomy · L5 · Schwarzschild Black Holes

Flashcards8 cards

What is a star cluster?1 / 8

A group of stars that formed together from the same giant cloud of gas and dust, and are held together by their mutual gravity.

Astronomy

Astronomy · L2 · Star Clusters

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Astronomy · L2 · Star Clusters

Note~184 words · 1 min

Going Back to Stay, Not Just Visit Humans last walked on the Moon in 1972. Now a new program, named Artemis after the twin sister of Apollo in Greek mythology, is bringing astronauts back — this time to stay longer and prepare for even fart

Astronomy

Astronomy · L1 · Artemis: Returning to the Moon

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Astronomy · L1 · Artemis: Returning to the Moon

Note~616 words · 3 min

The Kerr metric: frame dragging, the ergosphere, and the Penrose process A rotating black hole is described by the Kerr metric, characterised entirely by its mass M and spin angular momentum J (or the dimensionless spin parameter a = J/Mc,

Astronomy