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Astronomy: explore STEM content (page 4 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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Quiz3 questions

What causes day and night on Earth?

AThe Sun moves around EarthBEarth spins on its axisCThe Moon blocks the SunDClouds cover the Sun

Astronomy

Astronomy · L1 · Day and Night

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Astronomy · L1 · Day and Night

Flashcards8 cards

State Einstein's equivalence principle.1 / 8

The effects of a uniform gravitational field are locally indistinguishable from the effects of uniform acceleration in the absence of gravity. A person in a windowless, accelerating rocket cannot tell (by any local experiment) whether they are accelerating through space or sitting stationary in a gravitational field of equivalent strength. This equivalence is the conceptual foundation of general relativity.

Astronomy

Astronomy · L4 · General Relativity Basics

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Astronomy · L4 · General Relativity Basics

Quiz4 questions

What did the geocentric model claim?

AThe Sun is at the center of the universeBEarth is at the center, with everything else orbiting itCThe Moon is at the center of the solar systemDThere is no center to the universe

Astronomy

Astronomy · L2 · The Copernican Revolution

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Astronomy · L2 · The Copernican Revolution

Collection3 items

01Astronomy · L3 · Moon Formation & the Giant Impact

02Astronomy · L3 · Moon Formation & the Giant Impact

03Astronomy · L3 · Moon Formation & the Giant Impact

Astronomy

Astronomy · L3 · Moon Formation & the Giant Impact

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Astronomy · L3 · Moon Formation & the Giant Impact

Flowchart12 objects

Astronomy

Astronomy · L4 · Building a Star's Space Velocity

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Astronomy · L4 · Building a Star's Space Velocity

Flashcards7 cards

What is the Milky Way?1 / 7

The huge collection of stars, gas, and dust that our Sun and Solar System belong to — our home galaxy.

Astronomy

Astronomy · L1 · Spotting the Milky Way

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Astronomy · L1 · Spotting the Milky Way

Flowchart7 objects

Astronomy

Astronomy · L1 · Satellites: Natural & Artificial · flowchart

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Astronomy · L1 · Satellites: Natural & Artificial · flowchart

Note~185 words · 1 min

Our Closest Star The Sun looks different from the stars we see at night, but it is exactly the same kind of thing — a star. It only looks so big and bright because it is much, much closer to us than any other star. The Sun is a giant ball o

Astronomy

Astronomy · L1 · The Sun, Our Star

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Astronomy · L1 · The Sun, Our Star

Collection3 items

01Astronomy · L5 · Strong-Lensing Time-Delay Cosmography & the Hubble Tension

02Astronomy · L5 · Strong-Lensing Time-Delay Cosmography & the Hubble Tension

03Astronomy · L5 · Strong-Lensing Time-Delay Cosmography & the Hubble Tension

Astronomy

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

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

Note~411 words · 2 min

Rings: Countless Independent Orbits A planetary ring is not a solid object. It is a swarm of countless individual particles — from dust grains to boulder-sized chunks, mostly water ice with some rock — each independently orbiting the planet

Astronomy

Astronomy · L3 · Planetary Ring & Moon Systems

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Astronomy · L3 · Planetary Ring & Moon Systems

Collection4 items

01Astronomy · L3 · Planetary Ring & Moon Systems

02Astronomy · L3 · Planetary Ring & Moon Systems

03Astronomy · L3 · Regular Moon or Irregular Moon?

+1 more

Astronomy

Astronomy · L3 · Planetary Ring & Moon Systems

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Astronomy · L3 · Planetary Ring & Moon Systems

Quiz5 questions

Why does the Gunn-Peterson trough saturate so quickly, becoming insensitive once reionization is well underway?

ABecause quasars stop emitting light at high redshiftBBecause the optical depth for resonant Lyman-α scattering is so large that even x_HI ~ 10⁻⁴ produces total absorptionCBecause the CMB dominates the quasar spectrum at those wavelengthsDBecause reionization happens instantaneously

Astronomy

Astronomy · L5 · The Epoch of Reionization

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Astronomy · L5 · The Epoch of Reionization

Collection3 items

01Astronomy · L3 · Dark Matter & Dark Energy

02Astronomy · L3 · Dark Matter & Dark Energy

03Astronomy · L3 · Dark Matter & Dark Energy

Astronomy

Astronomy · L3 · Dark Matter & Dark Energy

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Astronomy · L3 · Dark Matter & Dark Energy

Collection3 items

01Astronomy · L2 · Navigating the Night Sky

02Astronomy · L2 · Navigating the Night Sky

03Astronomy · L2 · Navigating the Night Sky

Astronomy

Astronomy · L2 · Navigating the Night Sky

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Astronomy · L2 · Navigating the Night Sky

Quiz4 questions

Why is the mass quadrupole (not the dipole) the lowest-order source of gravitational radiation?

AGravitational dipole radiation is forbidden by momentum conservationBDipole radiation exists but is always too weak to detectCOnly spherically symmetric systems can radiate gravitationallyDThe quadrupole moment is always larger than the dipole moment

Astronomy

Astronomy · L5 · Gravitational Waves

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Astronomy · L5 · Gravitational Waves

Flowchart12 objects

Astronomy

Astronomy · L5 · The Epoch of Reionization and the Redshifted 21 cm Line · flowchart

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Astronomy · L5 · The Epoch of Reionization and the Redshifted 21 cm Line · flowchart

Note~304 words · 2 min

From Cosmic Dawn to Reionization After recombination (z ≈ 1100) leaves the universe neutral, the 'dark ages' persist until the first stars and galaxies (Population III and early Population II) form around z ~ 20-30. Their ionizing UV photon

Astronomy

Astronomy · L5 · The Epoch of Reionization and the Redshifted 21 cm Line

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Astronomy · L5 · The Epoch of Reionization and the Redshifted 21 cm Line

Collection3 items

01Astronomy · L5 · Tidal Disruption Events

02Astronomy · L5 · Tidal Disruption Events: From Stellar Shredding to Observed Flares

03Astronomy · L5 · Tidal Disruption Events

Astronomy

Astronomy · L5 · Tidal Disruption Events

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Astronomy · L5 · Tidal Disruption Events

Flowchart12 objects

Astronomy

Astronomy · L1 · The Space Station · flowchart

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Astronomy · L1 · The Space Station · flowchart

Flowchart7 objects

Astronomy

Astronomy · L1 · Mars Exploration · flowchart

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Astronomy · L1 · Mars Exploration · flowchart

Quiz5 questions

The coexistence of O₂ and CH₄ in an atmosphere is a stronger biosignature than either gas alone because:

ABoth gases are individually undetectable, so only their sum mattersBThe two gases react and would be destroyed unless something continuously replenishes them — implying an active source, plausibly biologicalCO₂ and CH₄ can only ever be produced by photosynthesisDThe combination has no chemical significance

Astronomy

Astronomy · L4 · Astrobiology & Biosignatures — 5 Q

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Astronomy · L4 · Astrobiology & Biosignatures — 5 Q

Flashcards8 cards

What is a galactic rotation curve?1 / 8

A rotation curve plots a galaxy's orbital speed v as a function of galactocentric radius r — how fast stars and gas orbit the galactic centre at different distances from it. It is measured using Doppler shifts of starlight or the 21 cm hydrogen line across a galaxy's disk.

Astronomy

Astronomy · L4 · Galactic Dynamics & the Rotation Curve Problem

@openstem

Astronomy · L4 · Galactic Dynamics & the Rotation Curve Problem

Quiz6 questions

What is a black hole?

AA hole burned into a planetBA place where gravity is so strong that not even light escapesCA very dark cloud of dustDAn empty patch of space with nothing in it

Astronomy

Astronomy · L1 · Black Holes Quiz

@openstem

Astronomy · L1 · Black Holes Quiz

Collection4 items

01Astronomy · L5 · Gravitational Waves

02Astronomy · L5 · Gravitational Waves: Quadrupole Radiation, Chirp Signals, and Detection

03Astronomy · L5 · Binary Inspiral: From Wide Orbit to Chirp Detection

+1 more

Astronomy

Astronomy · L5 · Gravitational Waves

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Astronomy · L5 · Gravitational Waves

Quiz6 questions

Why do astronomers launch telescopes into space?

ATo make them cheaper to buildBTo avoid the atmosphere's blur and blocked wavelengthsCBecause space telescopes are easier to repairDTo get closer to the stars

Astronomy

Astronomy · L2 · Space Telescopes Quiz

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Astronomy · L2 · Space Telescopes Quiz

Flowchart13 objects

Astronomy

Astronomy · L2 · A Star's Life, From Birth to Death

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Astronomy · L2 · A Star's Life, From Birth to Death

Flowchart7 objects

Astronomy

Astronomy · L2 · Timeline of Mars Rover Missions

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Astronomy · L2 · Timeline of Mars Rover Missions

Flowchart24 objects

Astronomy

Astronomy · L4 · Stellar life cycle: from protostar to white dwarf, neutron star, or black hole

@openstem

Astronomy · L4 · Stellar life cycle: from protostar to white dwarf, neutron star, or black hole

Flashcards8 cards

What is meant by a star's 'nucleosynthesis yield'?1 / 8

A stellar yield is the mass (or mass fraction) of each chemical element that a star of a given initial mass and metallicity returns to the interstellar medium (ISM) over its lifetime, via stellar winds and its terminal explosion or shedding event. Yields differ dramatically by mass and evolutionary channel — massive stars, AGB stars, and Type Ia supernovae each enrich the ISM with characteristically different mixes of elements, which is the basic input every galactic chemical evolution model needs.

Astronomy

Astronomy · L5 · Galactic Chemical Evolution

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Astronomy · L5 · Galactic Chemical Evolution

Collection3 items

01Astronomy · L1 · Gravity

02Astronomy · L1 · Gravity

03Astronomy · L1 · Gravity Quiz

Astronomy

Astronomy · L1 · Gravity

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Astronomy · L1 · Gravity

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