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Astronomy: explore STEM content (page 19 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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Flashcards7 cards

What is a neutron star made of?1 / 7

Almost entirely neutrons, packed together at nuclear densities — the collapsed core of a massive star, left over after a supernova, supported against further collapse by neutron degeneracy pressure.

Astronomy

Astronomy · L3 · Black Holes & Neutron Stars

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Astronomy · L3 · Black Holes & Neutron Stars

Flowchart9 objects

Astronomy

Astronomy · L2 · Timeline of the Copernican Revolution

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Astronomy · L2 · Timeline of the Copernican Revolution

Flowchart15 objects

Astronomy

Astronomy · L3 · Cosmic Rays & High-Energy Astrophysics · flowchart

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Astronomy · L3 · Cosmic Rays & High-Energy Astrophysics · flowchart

Flowchart9 objects

Astronomy

Astronomy · L3 · Stellar Classification · flowchart

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Astronomy · L3 · Stellar Classification · flowchart

Quiz7 questions

What causes relativistic beaming of a jet's radiation?

AGravitational lensing by the central black holeBRelativistic aberration sweeping emission forward into a narrow cone around the direction of motionCMagnetic reflection off the accretion diskDScattering of the jet's own radiation by interstellar dust

Astronomy

Astronomy · L5 · Relativistic Jets: Doppler Beaming & Superluminal Motion

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Astronomy · L5 · Relativistic Jets: Doppler Beaming & Superluminal Motion

Flashcards8 cards

Why are binary star systems so important for measuring stellar masses?1 / 8

Mass cannot be measured directly from a star's light — only its effects on motion reveal it. In a binary system, the two stars' mutual gravitational orbit obeys Kepler's laws in a form that depends on both masses, so measuring the orbit (period and separation) directly yields the total system mass — binaries are essentially the only way to measure stellar masses independently of stellar models.

Astronomy

Astronomy · L4 · Binary Star Systems & the Mass-Period Relation

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Astronomy · L4 · Binary Star Systems & the Mass-Period Relation

Flashcards8 cards

What does 'one year' actually measure?1 / 8

The time it takes Earth to travel all the way around the Sun once.

Astronomy

Astronomy · L1 · Why a Year Has 365 Days

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Astronomy · L1 · Why a Year Has 365 Days

Flowchart5 objects

Astronomy

Astronomy · L1 · Humans on the Moon · flowchart

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Astronomy · L1 · Humans on the Moon · flowchart

Note~207 words · 1 min

A Rivalry Reaches Orbit In the years after World War II, the United States and the Soviet Union became rival superpowers locked in the Cold War. Beyond weapons and politics, the two nations competed to prove technological superiority — and

Astronomy

Astronomy · L2 · The Space Race

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Astronomy · L2 · The Space Race

Flowchart13 objects

Astronomy

Astronomy · L4 · Which Lagrange Point?

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Astronomy · L4 · Which Lagrange Point?

Quiz4 questions

What was Sputnik 1?

AThe first human spaceflightBThe first artificial satellite, launched by the USSRCThe first Moon landingDThe first American space station

Astronomy

Astronomy · L2 · The Space Race

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Astronomy · L2 · The Space Race

Quiz4 questions

What is the Sun?

AA giant planetBA starCA moonDA comet

Astronomy

Astronomy · L1 · The Sun, Our Star Quiz

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Astronomy · L1 · The Sun, Our Star Quiz

Plot1 plot · 1 param

Astronomy

Astronomy · L3 · Tidal Cycle: y = sin(b·x)

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Astronomy · L3 · Tidal Cycle: y = sin(b·x)

Flashcards7 cards

List the electromagnetic spectrum bands used in astronomy, from longest to shortest wavelength.1 / 7

Radio, microwave, infrared, visible light, ultraviolet, X-ray, and gamma-ray.

Astronomy

Astronomy · L3 · The EM Spectrum in Astronomy

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Astronomy · L3 · The EM Spectrum in Astronomy

Flashcards7 cards

What is a primordial black hole (PBH), and how does its formation differ from a stellar-collapse black hole?1 / 7

A primordial black hole forms not from the collapse of a dying star, but from the direct gravitational collapse of an unusually large density perturbation in the very early universe, at the moment that perturbation's scale re-enters the causal horizon. Because they don't require a stellar progenitor, PBHs could in principle span an enormous mass range — from far below a solar mass up to, speculatively, supermassive scales.

Astronomy

Astronomy · L5 · Primordial Black Holes

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Astronomy · L5 · Primordial Black Holes

Quiz6 questions

What happens during a solar eclipse?

AEarth's shadow falls on the MoonBThe Moon passes between the Sun and EarthCThe Sun passes behind EarthDThe Moon disappears

Astronomy

Astronomy · L1 · Solar and Lunar Eclipses Quiz

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Astronomy · L1 · Solar and Lunar Eclipses Quiz

Flowchart9 objects

Astronomy

Astronomy · L1 · Venus, Earth's Unfriendly Twin · flowchart

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Astronomy · L1 · Venus, Earth's Unfriendly Twin · flowchart

Note~481 words · 2 min

Stellar structure: hydrostatic equilibrium and mass continuity A star is a self-gravitating ball of hot plasma held in a delicate, long-lived balance. The basic equations of stellar structure describe that balance at the level of undergradu

Astronomy

Astronomy · L4 · Stellar structure: hydrostatic equilibrium and mass continuity

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Astronomy · L4 · Stellar structure: hydrostatic equilibrium and mass continuity

Flowchart11 objects

Astronomy

Astronomy · L4 · Binary star systems: the mass-period relation and observational classes · flowchart

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Astronomy · L4 · Binary star systems: the mass-period relation and observational classes · flowchart

Collection3 items

01Astronomy · L1 · Why a Year Has 365 Days

02Astronomy · L1 · Why a Year Has 365 Days

03Astronomy · L1 · Why a Year Has 365 Days Quiz

Astronomy

Astronomy · L1 · Why a Year Has 365 Days

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Astronomy · L1 · Why a Year Has 365 Days

Flowchart13 objects

Astronomy

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

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

Flashcards8 cards

What is a blackbody, and why are stars well approximated as blackbodies?1 / 8

A blackbody is an idealised object that absorbs all incident radiation (reflecting none) and re-emits energy purely as a function of its temperature, with a specific, universal spectral shape (the Planck spectrum). Stellar photospheres are dense, opaque plasma that absorb and re-emit radiation many times before it escapes, closely approximating this idealised thermal equilibrium — so stars' continuous spectra are well fit by blackbody curves.

Astronomy

Astronomy · L4 · Blackbody Radiation & the Luminosity-Radius-Temperature Relation

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Astronomy · L4 · Blackbody Radiation & the Luminosity-Radius-Temperature Relation

Note~455 words · 2 min

Same Material, Different Light A nebula is, at its simplest, an interstellar cloud of gas and dust. What separates the different named types is not what the cloud is made of, but how — or whether — it produces visible light, which in turn d

Astronomy

Astronomy · L3 · Nebula Types

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Astronomy · L3 · Nebula Types

Flowchart13 objects

Astronomy

Astronomy · L3 · Spectroscopy & Redshift · flowchart

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Astronomy · L3 · Spectroscopy & Redshift · flowchart

Note~231 words · 1 min

The Outer Edge of the Solar System Beyond Jupiter and Saturn lie two more giant planets: Uranus and Neptune. They are farther from the Sun, colder, and smaller than Jupiter and Saturn, but they are still much bigger than Earth. Because they

Astronomy

Astronomy · L1 · Neptune and Uranus, the Ice Giants

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Astronomy · L1 · Neptune and Uranus, the Ice Giants

Flowchart11 objects

Astronomy

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

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

Quiz4 questions

What is the main cause of ocean tides on Earth?

AWind blowing across the ocean surfaceBThe Moon's gravity pulling on Earth's oceansCEarth's rotation alone, with no outside influenceDOcean currents changing temperature

Astronomy