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Astronomy: explore STEM content (page 6 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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Quiz7 questions

What causes an emission nebula to glow?

AIt reflects starlight off its dust grainsBUltraviolet radiation from nearby hot stars ionises its gas, which then emits light as electrons recombineCIt is heated by cosmic ray bombardment aloneDIt glows from residual heat left over from the Big Bang

Astronomy

Astronomy · L3 · Nebula Types

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Astronomy · L3 · Nebula Types

Flowchart13 objects

Astronomy

Astronomy · L2 · Meteoroid, Meteor, Meteorite

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Astronomy · L2 · Meteoroid, Meteor, Meteorite

Note~236 words · 1 min

A Convergent, Multi-Scale Case for Dark Matter No single observation proves dark matter exists; rather, several independent lines of evidence — spanning galaxy, cluster, and cosmological scales, using entirely different physical mechanisms

Astronomy

Astronomy · L5 · Dark Matter: Evidence and Candidate Particles

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Astronomy · L5 · Dark Matter: Evidence and Candidate Particles

Flashcards7 cards

What is the International Space Station (ISS)?1 / 7

A large research station orbiting about 400 km above Earth, built and operated by multiple countries. It has been continuously crewed by rotating astronaut teams since November 2000.

Astronomy

Astronomy · L2 · Modern Space Missions and Rovers

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Astronomy · L2 · Modern Space Missions and Rovers

Flowchart23 objects

Astronomy

Astronomy · L4 · The Solar System: planets, asteroid belt, and Kuiper Belt

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Astronomy · L4 · The Solar System: planets, asteroid belt, and Kuiper Belt

Quiz5 questions

Which band of the electromagnetic spectrum carries the highest-energy photons?

ARadioBInfraredCGamma-rayDVisible light

Astronomy

Astronomy · L3 · The EM Spectrum in Astronomy

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Astronomy · L3 · The EM Spectrum in Astronomy

Flashcards7 cards

What does the Big Bang model describe?1 / 7

That the observable Universe began roughly 13.8 billion years ago from an extremely hot, dense state, and has been expanding and cooling ever since — not an explosion into pre-existing space, but an expansion of space itself.

Astronomy

Astronomy · L3 · The Big Bang & Cosmology

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Astronomy · L3 · The Big Bang & Cosmology

Flowchart5 objects

Astronomy

Astronomy · L1 · Why We Have Seasons

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Astronomy · L1 · Why We Have Seasons

Quiz5 questions

Which two planets are called the 'ice giants'?

AJupiter and SaturnBUranus and NeptuneCMars and VenusDMercury and Pluto

Astronomy

Astronomy · L1 · Neptune and Uranus Quiz

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Astronomy · L1 · Neptune and Uranus Quiz

Flowchart13 objects

Astronomy

Astronomy · L2 · The Life Cycle of Stars · flowchart

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Astronomy · L2 · The Life Cycle of Stars · flowchart

Flowchart11 objects

Astronomy

Astronomy · L3 · Black Holes & Neutron Stars · flowchart

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Astronomy · L3 · Black Holes & Neutron Stars · flowchart

Flowchart11 objects

Astronomy

Astronomy · L3 · Asteroid Impacts & Craters · flowchart

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Astronomy · L3 · Asteroid Impacts & Craters · flowchart

Flowchart15 objects

Astronomy

Astronomy · L5 · Relativistic Jets: Doppler Beaming and Apparent Superluminal Motion · flowchart

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Astronomy · L5 · Relativistic Jets: Doppler Beaming and Apparent Superluminal Motion · flowchart

Note~235 words · 1 min

Light Is More Than What We See Visible light is only a narrow slice of the full electromagnetic spectrum. Every band, from long-wavelength radio waves to extremely short-wavelength gamma rays, carries different information about the Univers

Astronomy

Astronomy · L3 · The EM Spectrum in Astronomy

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Astronomy · L3 · The EM Spectrum in Astronomy

Collection3 items

01Astronomy · L1 · Venus, Earth's Unfriendly Twin

02Astronomy · L1 · Venus, Earth's Unfriendly Twin

03Astronomy · L1 · Venus, Earth's Unfriendly Twin Quiz

Astronomy

Astronomy · L1 · Venus, Earth's Unfriendly Twin

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Astronomy · L1 · Venus, Earth's Unfriendly Twin

Flowchart11 objects

Astronomy

Astronomy · L5 · What Sets the Sign of the 21 cm Brightness Temperature

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Astronomy · L5 · What Sets the Sign of the 21 cm Brightness Temperature

Quiz7 questions

Why do different images of a strongly lensed quasar show the same brightness fluctuation at different times?

AEach image is actually a completely different, unrelated quasarBEach image's light follows a different path length and gravitational potential depth through the lensCThe quasar itself flickers independently in each directionDAtmospheric effects on Earth delay some images but not others

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~364 words · 2 min

Collapse at Horizon Re-Entry Unlike an ordinary stellar-collapse black hole, a primordial black hole (PBH) forms directly from a sufficiently large density perturbation in the radiation-dominated early universe, at the instant that perturba

Astronomy

Astronomy · L5 · Primordial Black Holes: Formation and Dark-Matter Constraints

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Astronomy · L5 · Primordial Black Holes: Formation and Dark-Matter Constraints

Collection4 items

01Astronomy · L4 · The Galactic Center and Sagittarius A*

02Astronomy · L4 · Weighing Sagittarius A*: stellar orbits at the Galactic Center

03Astronomy · L4 · From decades of astrometry to a supermassive black hole

+1 more

Astronomy

Astronomy · L4 · The Galactic Center and Sagittarius A*

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Astronomy · L4 · The Galactic Center and Sagittarius A*

Note~178 words · 1 min

Four Seasons, One Tilted Earth Earth doesn't spin perfectly upright — its axis leans over by about 23.5 degrees. That single tilt is the reason we get four different seasons every year. As Earth travels around the Sun over the year, the til

Astronomy

Astronomy · L1 · The Four Seasons

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Astronomy · L1 · The Four Seasons

Collection3 items

01Astronomy · L5 · Large-Scale Structure and the Cosmic Web

02Astronomy · L5 · Large-Scale Structure: The Two-Point Correlation Function and the Cosmic Web

03Astronomy · L5 · Large-Scale Structure and the Cosmic Web

Astronomy

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

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

Collection4 items

01Astronomy · L2 · The Milky Way and Other Galaxies

02Astronomy · L2 · The Milky Way and Other Galaxies

03Astronomy · L2 · Types of Galaxies

+1 more

Astronomy

Astronomy · L2 · The Milky Way and Other Galaxies

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Astronomy · L2 · The Milky Way and Other Galaxies

Quiz4 questions

Why is Venus sometimes called Earth's 'twin'?

AIt has oceans just like EarthBIt is close to Earth in size and made of similar rockCPeople can breathe its airDIt orbits the Sun at the same speed as Earth

Astronomy

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

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

Note~191 words · 1 min

Pushing Against Gravity Getting to space is hard because Earth's gravity holds on tight. A rocket has to move extremely fast — thousands of kilometres per hour — to break free and stay in orbit or head further out. To reach that speed, a ro

Astronomy

Astronomy · L1 · Rockets

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Astronomy · L1 · Rockets

Flashcards7 cards

What mainly causes ocean tides?1 / 7

The Moon's gravity pulls on Earth's oceans, creating a bulge of water on the side of Earth facing the Moon.

Astronomy

Astronomy · L2 · Tides and the Moon's Pull

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Astronomy · L2 · Tides and the Moon's Pull

Quiz4 questions

What is a star cluster?

AA group of stars that formed together and are held together by gravityBAny two stars that happen to appear close together from EarthCA single star that is unusually brightDA cluster of planets orbiting one star

Astronomy

Astronomy · L2 · Star Clusters

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Astronomy · L2 · Star Clusters

Flowchart10 objects

Astronomy

Astronomy · L1 · Why a Year Has 365 Days · flowchart

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Astronomy · L1 · Why a Year Has 365 Days · flowchart

Flashcards8 cards

What is the Eddington luminosity, and where does its formula come from?1 / 8

The Eddington luminosity is the maximum luminosity at which outward radiation pressure on ionised gas balances inward gravity for spherical accretion (or, more loosely, sets a characteristic scale for disk accretion). Balancing radiation pressure on free electrons (via Thomson scattering, cross-section σ_T) against gravity on the associated protons gives:

Astronomy

Astronomy · L5 · Accretion Disk Physics

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Astronomy · L5 · Accretion Disk Physics

Flashcards8 cards

What was Ptolemy's geocentric model, and how did it explain retrograde motion?1 / 8

A model, dominant for roughly 1400 years, in which Earth sits motionless at the centre of the universe and everything else orbits it. To explain planets occasionally appearing to move backward (retrograde motion), Ptolemy added epicycles — small circular loops layered on top of the main orbital circle.

Astronomy

Astronomy · L3 · History of Astronomy: Paradigm Shifts

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Astronomy · L3 · History of Astronomy: Paradigm Shifts

Collection4 items

01Astronomy · L3 · Star Formation & Molecular Clouds

02Astronomy · L3 · Star Formation & Molecular Clouds

03Astronomy · L3 · From Molecular Cloud to Star

+1 more

Astronomy

Astronomy · L3 · Star Formation & Molecular Clouds

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Astronomy · L3 · Star Formation & Molecular Clouds

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