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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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Flowchart13 objects

Astronomy

Astronomy · L2 · The Space Race · flowchart

@openstem

Astronomy · L2 · The Space Race · flowchart

Collection4 items

01Astronomy · L3 · Nebula Types

02Astronomy · L3 · Nebula Types

03Astronomy · L3 · Which Type of Nebula?

+1 more

Astronomy

Astronomy · L3 · Nebula Types

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Astronomy · L3 · Nebula Types

Collection3 items

01Astronomy · L1 · Finding Stars & Planets in the Sky

02Astronomy · L1 · Finding Stars & Planets in the Sky

03Astronomy · L1 · Finding Stars & Planets in the Sky Quiz

Astronomy

Astronomy · L1 · Finding Stars & Planets in the Sky

@openstem

Astronomy · L1 · Finding Stars & Planets in the Sky

Quiz6 questions

Why does a collapsing cloud spin faster as it shrinks?

ABecause gravity directly speeds up rotationBBecause angular momentum L = Iω is conserved as the moment of inertia I decreasesCBecause the cloud heats upDIt doesn't — the spin rate stays constant

Astronomy

Astronomy · L3 · Solar System Formation Quiz

@openstem

Astronomy · L3 · Solar System Formation Quiz

Flowchart13 objects

Astronomy

Astronomy · L5 · Neutron Star Structure, the TOV Equation, and Pulsars/Magnetars · flowchart

@openstem

Astronomy · L5 · Neutron Star Structure, the TOV Equation, and Pulsars/Magnetars · flowchart

Flowchart20 objects

Astronomy

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

@openstem

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

Flowchart15 objects

Astronomy

Astronomy · L5 · Dark Matter: Evidence and Candidate Particles · flowchart

@openstem

Astronomy · L5 · Dark Matter: Evidence and Candidate Particles · flowchart

Note~540 words · 3 min

The cosmic distance ladder: parallax, Cepheids, and Type Ia supernovae No single technique measures distance across the entire observable universe. Instead, astronomers use a chain of overlapping methods — the cosmic distance ladder — where

Astronomy

Astronomy · L4 · The cosmic distance ladder: parallax, Cepheids, and Type Ia supernovae

@openstem

Astronomy · L4 · The cosmic distance ladder: parallax, Cepheids, and Type Ia supernovae

Note~298 words · 1 min

Two Enrichment Timescales Galactic chemical evolution is fundamentally shaped by the fact that different nucleosynthesis sources operate on very different delay timescales relative to star formation, so a stellar population's detailed abund

Astronomy

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

@openstem

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

Collection4 items

01Astronomy · L4 · The Cosmic Microwave Background: Recombination & Anisotropies

02Astronomy · L4 · The cosmic microwave background: recombination, decoupling, and anisotropies

03Astronomy · L4 · From density fluctuations to observed CMB anisotropies and structure

+1 more

Astronomy

Astronomy · L4 · The Cosmic Microwave Background

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Astronomy · L4 · The Cosmic Microwave Background

Flowchart13 objects

Astronomy

Astronomy · L4 · White Dwarfs: Electron Degeneracy Pressure & the Chandrasekhar Limit · flowchart

@openstem

Astronomy · L4 · White Dwarfs: Electron Degeneracy Pressure & the Chandrasekhar Limit · flowchart

Quiz5 questions

What does ξ(r) > 0 indicate about the distribution of galaxies at separation r?

AGalaxies are less clustered than a random (Poisson) distribution at that separationBGalaxies are more clustered than a random (Poisson) distribution at that separationCThe correlation function is undefined for positive valuesDThe galaxy density field is perfectly uniform

Astronomy

Astronomy · L5 · Large-Scale Structure and the Cosmic Web

@openstem

Astronomy · L5 · Large-Scale Structure and the Cosmic Web

Collection3 items

01Astronomy · L4 · The Interstellar Medium: Gas, Dust & the 21 cm Line

02Astronomy · L4 · The interstellar medium: gas, dust, the 21 cm line, and extinction

03Astronomy · L4 · The Interstellar Medium — 4 Q

Astronomy

Astronomy · L4 · The Interstellar Medium

@openstem

Astronomy · L4 · The Interstellar Medium

Flowchart7 objects

Astronomy

Astronomy · L4 · Orbital mechanics: vis-viva, orbital energy, and Hohmann transfers · flowchart

@openstem

Astronomy · L4 · Orbital mechanics: vis-viva, orbital energy, and Hohmann transfers · flowchart

Collection3 items

01Astronomy · L4 · Stellar Populations, the Initial Mass Function & Cluster Evolution

02Astronomy · L4 · Stellar populations: the initial mass function and cluster dynamical evolution

03Astronomy · L4 · Stellar Populations & the Initial Mass Function — 4 Q

Astronomy

Astronomy · L4 · Stellar Populations, the Initial Mass Function & Cluster Evolution

@openstem

Astronomy · L4 · Stellar Populations, the Initial Mass Function & Cluster Evolution

Collection4 items

01Astronomy · L4 · White Dwarfs: Degeneracy Pressure & the Chandrasekhar Limit

02Astronomy · L4 · White Dwarfs: Electron Degeneracy Pressure & the Chandrasekhar Limit

03Astronomy · L4 · What Supports the Core?

+1 more

Astronomy

Astronomy · L4 · White Dwarfs: Degeneracy Pressure & the Chandrasekhar Limit

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Astronomy · L4 · White Dwarfs: Degeneracy Pressure & the Chandrasekhar Limit

Note~298 words · 1 min

The Jeans Instability, Generalised to an Expanding Universe The classical Jeans criterion asks when self-gravity overcomes pressure support in a static medium, with the boundary set by the Jeans length λ_J = c_s√(π/Gρ). In an expanding FLRW

Astronomy

Astronomy · L5 · Cosmological Perturbation Theory: From Jeans Instability to Structure Growth

@openstem

Astronomy · L5 · Cosmological Perturbation Theory: From Jeans Instability to Structure Growth

Collection3 items

01Astronomy · L1 · Telescopes

02Astronomy · L1 · Telescopes

03Astronomy · L1 · Telescopes Quiz

Astronomy

Astronomy · L1 · Telescopes

@openstem

Astronomy · L1 · Telescopes

Quiz7 questions

What physical principle underlies electron degeneracy pressure in a white dwarf?

AThe ideal gas law relating pressure and temperatureBThe Pauli exclusion principle, which forbids electrons from sharing the same quantum stateCMagnetic pressure from the star's own fieldDRadiation pressure from residual fusion

Astronomy

Astronomy · L4 · White Dwarfs: Degeneracy Pressure & the Chandrasekhar Limit

@openstem

Astronomy · L4 · White Dwarfs: Degeneracy Pressure & the Chandrasekhar Limit

Flowchart13 objects

Astronomy

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

@openstem

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

Quiz4 questions

What is the solar wind?

AA stream of charged particles flowing out from the SunBA type of storm in Earth's atmosphereCWind caused by Earth's rotationDLight emitted by the Sun's core

Astronomy

Astronomy · L2 · Auroras and Earth's Magnetosphere

@openstem

Astronomy · L2 · Auroras and Earth's Magnetosphere

Note~190 words · 1 min

Our Galactic Address Every star you can see with the naked eye — and our Sun — belongs to one galaxy: the Milky Way, a huge, rotating collection of stars, gas, and dust held together by gravity. The Milky Way is a barred spiral galaxy: a fl

Astronomy

Astronomy · L2 · The Milky Way and Other Galaxies

@openstem

Astronomy · L2 · The Milky Way and Other Galaxies

Plot1 plot · 1 param

Astronomy

Astronomy · L3 · Exoplanet Transit Light Curve

@openstem

Astronomy · L3 · Exoplanet Transit Light Curve

Note~266 words · 1 min

Energy Generation in Main-Sequence Stars Stars on the main sequence are powered by hydrogen fusion in their cores. Two pathways dominate: the proton–proton (pp) chain (dominant in stars like the Sun and below) and the CNO cycle (dominant in

Astronomy

Astronomy · L5 · Stellar Nucleosynthesis: pp Chain and CNO Cycle

@openstem

Astronomy · L5 · Stellar Nucleosynthesis: pp Chain and CNO Cycle

Flashcards8 cards

Why is Venus sometimes called Earth's 'twin'?1 / 8

It is very close to Earth in size and made of similar rocky material.

Astronomy

Astronomy · L1 · Venus, Earth's Unfriendly Twin

@openstem

Astronomy · L1 · Venus, Earth's Unfriendly Twin

Flowchart13 objects

Astronomy

Astronomy · L1 · The Apollo 11 Mission

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Astronomy · L1 · The Apollo 11 Mission

Flashcards8 cards

Do you need a telescope to enjoy stargazing?1 / 8

No — you can spot lots of stars, planets, and patterns using just your eyes.

Astronomy

Astronomy · L1 · Finding Stars & Planets in the Sky

@openstem

Astronomy · L1 · Finding Stars & Planets in the Sky

Note~558 words · 3 min

General relativity: the equivalence principle and classic tests General relativity replaces Newton's picture of gravity as a force with a geometric picture: mass and energy curve spacetime, and objects simply follow the straightest paths av

Astronomy

Astronomy · L4 · General relativity: the equivalence principle and classic tests

@openstem

Astronomy · L4 · General relativity: the equivalence principle and classic tests

Collection4 items

01Astronomy · L3 · Celestial Coordinates & Precession

02Astronomy · L3 · Celestial Coordinates & Precession

03Astronomy · L3 · Right Ascension or Declination?

+1 more

Astronomy

Astronomy · L3 · Celestial Coordinates & Precession

@openstem

Astronomy · L3 · Celestial Coordinates & Precession

Note~232 words · 1 min

Leftovers From Planet Formation Not every piece of material in the young Solar System ended up inside a planet. Two great regions still hold enormous numbers of smaller leftover bodies today: the asteroid belt and the Kuiper Belt. The Aster

Astronomy

Astronomy · L2 · The Asteroid Belt and Kuiper Belt

@openstem

Astronomy · L2 · The Asteroid Belt and Kuiper Belt

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