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Astronomy: explore STEM content (page 25 of 26) · openstem

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.

Content Groups1

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Note~295 words · 1 min

Radiative Transfer and Line Formation A stellar spectrum results from radiative transfer through an atmosphere with a temperature gradient: continuum photons escape from progressively shallower (cooler) depths as one moves to wavelengths wh

Astronomy

Astronomy · L5 · Spectral Line Formation, the Curve of Growth, and Non-LTE Effects

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Astronomy · L5 · Spectral Line Formation, the Curve of Growth, and Non-LTE Effects

Note~287 words · 1 min

Five Ideas That Rewrote the Universe The history of astronomy is not a smooth accumulation of facts — it is a sequence of paradigm shifts, each one overturning the model that came before it once the evidence made the old picture untenable.

Astronomy

Astronomy · L3 · History of Astronomy: Paradigm Shifts

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Astronomy · L3 · History of Astronomy: Paradigm Shifts

Quiz4 questions

Where does nuclear fusion occur inside the Sun?

AThe coronaBThe photosphereCThe coreDThe convective zone

Astronomy

Astronomy · L2 · The Sun's Structure and Activity

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Astronomy · L2 · The Sun's Structure and Activity

Collection3 items

01Astronomy · L2 · Radio Astronomy Basics

02Astronomy · L2 · Radio Astronomy Basics

03Astronomy · L2 · Radio Astronomy Basics

Astronomy

Astronomy · L2 · Radio Astronomy Basics

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Astronomy · L2 · Radio Astronomy Basics

Flowchart9 objects

Astronomy

Astronomy · L2 · The Nebular Hypothesis

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Astronomy · L2 · The Nebular Hypothesis

Flowchart9 objects

Astronomy

Astronomy · L1 · Asteroids, Comets, and Meteors · flowchart

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Astronomy · L1 · Asteroids, Comets, and Meteors · flowchart

Flowchart13 objects

Astronomy

Astronomy · L3 · Which Type of Nebula?

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Astronomy · L3 · Which Type of Nebula?

Quiz4 questions

By mass, the interstellar medium is composed mostly of:

ADust grains, with a small amount of gasBGas (mostly hydrogen), with dust making up only about 1% by massCEqual parts gas and dustDHeavy elements like iron and gold

Astronomy

Astronomy · L4 · The Interstellar Medium — 4 Q

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Astronomy · L4 · The Interstellar Medium — 4 Q

Note~446 words · 2 min

Fixing a Position on the Sky Just as any point on Earth can be located with longitude and latitude, any point on the sky can be located with the equatorial coordinate system: right ascension and declination. The celestial equator is simply

Astronomy

Astronomy · L3 · Celestial Coordinates & Precession

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Astronomy · L3 · Celestial Coordinates & Precession

Collection4 items

01Astronomy · L3 · The Big Bang & Cosmology

02Astronomy · L3 · The Big Bang & Cosmology

03Astronomy · L3 · Timeline of the Early Universe

+1 more

Astronomy

Astronomy · L3 · The Big Bang & Cosmology

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Astronomy · L3 · The Big Bang & Cosmology

Flowchart12 objects

Astronomy

Astronomy · L2 · Planet, Dwarf Planet, or Small Body?

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Astronomy · L2 · Planet, Dwarf Planet, or Small Body?

Flowchart11 objects

Astronomy

Astronomy · L5 · Strong-Lensing Time-Delay Cosmography & the Hubble Tension · flowchart

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Astronomy · L5 · Strong-Lensing Time-Delay Cosmography & the Hubble Tension · flowchart

Flashcards8 cards

What is comparative planetology?1 / 8

The practice of comparing planets to each other to understand why they turned out the way they did — and what that reveals about the rules governing all planets.

Astronomy

Astronomy · L2 · Comparative Planetology

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Astronomy · L2 · Comparative Planetology

Note~165 words · 1 min

Exploring the Red Planet with Robots Mars is too far and too harsh for people to visit safely right now, so scientists send robotic rovers instead. These machines drive across the Martian surface, taking photos and testing rocks and soil. W

Astronomy

Astronomy · L1 · Mars Exploration

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Astronomy · L1 · Mars Exploration

Flowchart19 objects

Astronomy

Astronomy · L5 · Planet Formation Channels and What Exoplanet Demographics Reveal · flowchart

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Astronomy · L5 · Planet Formation Channels and What Exoplanet Demographics Reveal · flowchart

Flowchart17 objects

Astronomy

Astronomy · L5 · FLRW Cosmology: Expansion and Energy Content

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Astronomy · L5 · FLRW Cosmology: Expansion and Energy Content

Note~290 words · 1 min

Two Competing Formation Channels Giant planets can, in principle, form via two very different physical processes, operating on very different timescales and favouring different disk conditions: What Kepler-Era Demographics Add Large transit

Astronomy

Astronomy · L5 · Planet Formation Channels and What Exoplanet Demographics Reveal

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Astronomy · L5 · Planet Formation Channels and What Exoplanet Demographics Reveal

Flowchart10 objects

Astronomy

Astronomy · L4 · Variable stars: Cepheids, RR Lyrae, and asteroseismology · flowchart

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Astronomy · L4 · Variable stars: Cepheids, RR Lyrae, and asteroseismology · flowchart

Collection3 items

01Astronomy · L5 · The Kerr Metric: Frame Dragging, the Ergosphere & the Penrose Process

02Astronomy · L5 · The Kerr Metric: Frame Dragging, the Ergosphere & the Penrose Process

03Astronomy · L5 · Crossing Toward a Rotating Black Hole

Astronomy

Astronomy · L5 · The Kerr Metric: Frame Dragging, the Ergosphere & the Penrose Process

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Astronomy · L5 · The Kerr Metric: Frame Dragging, the Ergosphere & the Penrose Process

Flowchart7 objects

Astronomy

Astronomy · L1 · Stars and Constellations · flowchart

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Astronomy · L1 · Stars and Constellations · flowchart

Flowchart11 objects

Astronomy

Astronomy · L3 · Habitable Zones & the Search for Life · flowchart

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Astronomy · L3 · Habitable Zones & the Search for Life · flowchart

Quiz5 questions

In the OBAFGKM sequence, which class of star is the hottest?

AMBGCODK

Astronomy

Astronomy · L3 · Stellar Classification

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Astronomy · L3 · Stellar Classification

Note~493 words · 2 min

Protostellar evolution: from collapse to the main sequence Between the onset of a molecular cloud's gravitational collapse and a star's arrival on the stable main sequence lies a sequence of distinct observational stages, classified by how

Astronomy

Astronomy · L4 · Protostellar Evolution: From Collapse to the Main Sequence

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Astronomy · L4 · Protostellar Evolution: From Collapse to the Main Sequence

Quiz3 questions

The net reaction of the pp chain in the Sun converts 4 protons into one helium-4 nucleus and releases approximately how much energy?

A2.2 MeV (a single n–p binding)B8.5 MeV (one alpha decay)C26.7 MeV (total including neutrino losses)D938 MeV (rest mass of one proton)

Astronomy

Astronomy · L5 · Stellar Nucleosynthesis and FLRW Cosmology

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Astronomy · L5 · Stellar Nucleosynthesis and FLRW Cosmology

Note~327 words · 2 min

Where Could Life Exist? The search for life beyond Earth starts with a simple question: where could liquid water exist on a planet's surface? That range of orbital distances around a star is called the habitable zone. A star's luminosity se

Astronomy

Astronomy · L3 · Habitable Zones & the Search for Life

@openstem

Astronomy · L3 · Habitable Zones & the Search for Life

Flashcards8 cards

What is the habitable zone of a star?1 / 8

The range of orbital distances from a star where a planet's temperature could allow liquid water to exist on its surface — not so close that water boils away, not so far that it freezes solid.

Astronomy

Astronomy · L3 · Habitable Zones & the Search for Life

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Astronomy · L3 · Habitable Zones & the Search for Life

Flowchart15 objects

Astronomy

Astronomy · L5 · Galactic Chemical Evolution: Yields, Enrichment Timescales, and Gradients · flowchart

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Astronomy · L5 · Galactic Chemical Evolution: Yields, Enrichment Timescales, and Gradients · flowchart

Flashcards7 cards

What shape is the Milky Way galaxy?1 / 7

It's a barred spiral galaxy — a flat, rotating disc with curving spiral arms, and a bar-shaped structure of stars crossing through its central bulge.

Astronomy

Astronomy · L2 · The Milky Way and Other Galaxies

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Astronomy · L2 · The Milky Way and Other Galaxies

Quiz4 questions

Who were the first two people to walk on the Moon?

ANeil Armstrong and Buzz AldrinBMichael Collins and Neil ArmstrongCTwo robotsDA crew of four astronauts

Astronomy

Astronomy · L1 · Humans on the Moon Quiz

@openstem

Astronomy · L1 · Humans on the Moon Quiz

Flashcards8 cards

Define the tidal radius r_t, and state when a tidal disruption event (TDE) occurs.1 / 8

The tidal radius is the distance from a black hole at which its differential (tidal) gravity across a star exceeds the star's own self-gravity:

Astronomy

Astronomy · L5 · Tidal Disruption Events

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Astronomy · L5 · Tidal Disruption Events

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