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Astronomy: explore STEM content (page 23 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.

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Note~511 words · 3 min

The cosmic microwave background: recombination, decoupling, and anisotropies The cosmic microwave background (CMB) is the oldest light astronomers can observe directly — a snapshot of the universe as it existed roughly 380,000 years after t

Astronomy

Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies

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Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies

Quiz5 questions

What is a hot Jupiter?

AA rocky planet with a thick, superheated atmosphereBA gas giant orbiting very close to its star, with a period of only daysCA giant planet ejected from its system entirelyDA planet with an unusually hot, molten core

Astronomy

Astronomy · L3 · Exosolar System Architecture

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Astronomy · L3 · Exosolar System Architecture

Quiz4 questions

What causes a meteor shower?

AThe Moon explodingBEarth passing through a trail of comet dustCThe Sun sending out sparksDAirplanes flying at night

Astronomy

Astronomy · L1 · Meteor Showers Quiz

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Astronomy · L1 · Meteor Showers Quiz

Flowchart9 objects

Astronomy

Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies · flowchart

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Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies · flowchart

Quiz4 questions

Transmission spectroscopy detects an exoplanet's atmospheric composition by measuring:

AThe planet's total mass from its orbital wobbleBHow transit depth varies with wavelength, revealing wavelength-dependent atmospheric absorptionCThe planet's rotation period from its day-night temperature differenceDThe colour of reflected starlight only, with no wavelength dependence

Astronomy

Astronomy · L4 · Exoplanet Atmospheres & the Habitable Zone — 4 Q

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Astronomy · L4 · Exoplanet Atmospheres & the Habitable Zone — 4 Q

Note~530 words · 3 min

Orbital resonances, Lagrange points, and the restricted three-body problem Beyond simple two-body orbits, gravitational interactions between three or more bodies produce two of the Solar System's most important recurring structures: mean-mo

Astronomy

Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

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Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

Collection4 items

01Astronomy · L1 · Saturn's Rings

02Astronomy · L1 · Saturn's Rings

03Astronomy · L1 · What Makes Up Saturn's Rings

+1 more

Astronomy

Astronomy · L1 · Saturn's Rings

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Astronomy · L1 · Saturn's Rings

Flowchart7 objects

Astronomy

Astronomy · L1 · How a Black Hole Forms

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Astronomy · L1 · How a Black Hole Forms

Flowchart13 objects

Astronomy

Astronomy · L3 · Planetary Ring & Moon Systems · flowchart

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Astronomy · L3 · Planetary Ring & Moon Systems · flowchart

Quiz4 questions

What is the main difference between an asteroid and a comet?

AAsteroids are rocky; comets are icyBAsteroids are icy; comets are rockyCThere is no differenceDComets are planets

Astronomy

Astronomy · L1 · Asteroids, Comets, and Meteors Quiz

@openstem

Astronomy · L1 · Asteroids, Comets, and Meteors Quiz

Collection3 items

01Astronomy · L5 · Inflationary Cosmology

02Astronomy · L5 · Cosmic Inflation: Solving the Horizon and Flatness Problems

03Astronomy · L5 · Inflationary Cosmology

Astronomy

Astronomy · L5 · Inflationary Cosmology

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Astronomy · L5 · Inflationary Cosmology

Note~375 words · 2 min

Bottom-Up Assembly in a CDM Universe In the ΛCDM paradigm, the small, nearly scale-invariant density perturbations seeded by inflation grow under gravity, with the smallest scales crossing the non-linear collapse threshold first. This produ

Astronomy

Astronomy · L5 · Hierarchical Structure Formation and Galaxy Assembly

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Astronomy · L5 · Hierarchical Structure Formation and Galaxy Assembly

Flashcards8 cards

What is Low Earth Orbit (LEO)?1 / 8

An orbit roughly 160 to 2,000 km above Earth's surface, with an orbital period of about 90 minutes. The International Space Station and many imaging satellites use LEO.

Astronomy

Astronomy · L2 · Satellite Orbits and GPS

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Astronomy · L2 · Satellite Orbits and GPS

Note~204 words · 1 min

A Star Built in Layers The Sun isn't a single uniform ball — it's built from distinct layers, each behaving differently as energy generated in the core works its way outward. The Corona's Strange Heat One of the Sun's biggest puzzles: the c

Astronomy

Astronomy · L2 · The Sun's Structure and Activity

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Astronomy · L2 · The Sun's Structure and Activity

Flashcards9 cards

State the vis-viva equation and define every symbol in it.1 / 9

v² = GM(2/r − 1/a), where v is orbital speed at radius r, G is the gravitational constant, M is the central body's mass, r is the instantaneous distance from the focus, and a is the orbit's semi-major axis. It applies to any conic orbit (ellipse, parabola, hyperbola) once the correct sign and value of a are used.

Astronomy

Astronomy · L4 · Orbital Mechanics — Vis-Viva & Transfer Orbits

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Astronomy · L4 · Orbital Mechanics — Vis-Viva & Transfer Orbits

Flowchart7 objects

Astronomy

Astronomy · L2 · Why Astronomers Launch Telescopes Into Space

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Astronomy · L2 · Why Astronomers Launch Telescopes Into Space

Quiz7 questions

What does proper motion directly measure?

AA star's true speed through spaceBThe angular rate at which a star appears to move across the skyCA star's speed directly toward or away from the observerDA star's distance from Earth

Astronomy

Astronomy · L4 · Stellar Kinematics: Proper Motion, Radial Velocity & Space Velocity

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Astronomy · L4 · Stellar Kinematics: Proper Motion, Radial Velocity & Space Velocity

Quiz5 questions

What are cosmic rays mostly made of?

APhotons of visible lightBProtons, with smaller fractions of heavier nuclei and electronsCNeutrinos onlyDDust grains

Astronomy

Astronomy · L3 · Cosmic Rays & High-Energy Astrophysics

@openstem

Astronomy · L3 · Cosmic Rays & High-Energy Astrophysics

Collection4 items

01Astronomy · L1 · Solar and Lunar Eclipses

02Astronomy · L1 · Solar and Lunar Eclipses

03Astronomy · L1 · Solar Eclipse vs Lunar Eclipse

+1 more

Astronomy

Astronomy · L1 · Solar and Lunar Eclipses

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Astronomy · L1 · Solar and Lunar Eclipses

Flowchart13 objects

Astronomy

Astronomy · L5 · The Schwarzschild Black Hole: Horizon, Photon Sphere, and ISCO · flowchart

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Astronomy · L5 · The Schwarzschild Black Hole: Horizon, Photon Sphere, and ISCO · flowchart

Flashcards8 cards

What part of the electromagnetic spectrum do radio telescopes observe?1 / 8

Radio waves — the longest-wavelength, lowest-energy form of light, invisible to the human eye.

Astronomy

Astronomy · L2 · Radio Astronomy Basics

@openstem

Astronomy · L2 · Radio Astronomy Basics

Collection4 items

01Astronomy · L2 · Auroras and Earth's Magnetosphere

02Astronomy · L2 · Auroras and Earth's Magnetosphere

03Astronomy · L2 · From Solar Wind to Aurora

+1 more

Astronomy

Astronomy · L2 · Auroras and Earth's Magnetosphere

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Astronomy · L2 · Auroras and Earth's Magnetosphere

Collection4 items

01Astronomy · L3 · History of Astronomy: Paradigm Shifts

02Astronomy · L3 · History of Astronomy: Paradigm Shifts

03Astronomy · L3 · Five Paradigm Shifts in Astronomy

+1 more

Astronomy

Astronomy · L3 · History of Astronomy: Paradigm Shifts

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Astronomy · L3 · History of Astronomy: Paradigm Shifts

Quiz4 questions

How can you usually tell a planet from a star in the night sky?

APlanets are always brighter than starsBPlanets shine steadily; stars tend to twinkleCPlanets only appear in the morningDStars are always red

Astronomy

Astronomy · L1 · Finding Stars & Planets in the Sky Quiz

@openstem

Astronomy · L1 · Finding Stars & Planets in the Sky Quiz

Collection3 items

01Astronomy · L4 · Asteroseismology: Probing Stellar Interiors

02Astronomy · L4 · Asteroseismology and helioseismology: reading stellar interiors from oscillations

03Astronomy · L4 · Asteroseismology & Helioseismology — 5 Q

Astronomy

Astronomy · L4 · Asteroseismology: Probing Stellar Interiors

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Astronomy · L4 · Asteroseismology: Probing Stellar Interiors

Flowchart15 objects

Astronomy

Astronomy · L5 · Formation of a Schwarzschild Black Hole

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Astronomy · L5 · Formation of a Schwarzschild Black Hole

Quiz5 questions

What must happen inside a protostar for it to become a true main-sequence star?

AIts outer layers must cool completelyBIts core must reach about 10 million K and ignite sustained hydrogen fusionCIt must collide with another protostarDIt must lose most of its mass

Astronomy

Astronomy · L3 · Stellar Evolution

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Astronomy · L3 · Stellar Evolution

Flowchart9 objects

Astronomy

Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem · flowchart

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Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem · flowchart

Note~477 words · 2 min

Four Messengers, One Universe Multi-messenger astronomy combines fundamentally different carriers of astrophysical information, each sensitive to different physical conditions and each escaping its source under different circumstances: GW17

Astronomy

Astronomy · L5 · Multi-Messenger Astronomy: Gravitational Waves, Neutrinos, and Light from One Event

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Astronomy · L5 · Multi-Messenger Astronomy: Gravitational Waves, Neutrinos, and Light from One Event

Collection4 items

01Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

02Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

03Astronomy · L4 · Which Lagrange Point?

+1 more

Astronomy

Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

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Astronomy · L4 · Orbital Resonances, Lagrange Points & the Restricted Three-Body Problem

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