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Astronomy: explore STEM content (page 21 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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Quiz4 questions

What physical principle underlies neutron degeneracy pressure?

ACoulomb repulsion between like chargesBThe Pauli exclusion principle forbidding identical fermions from occupying the same quantum stateCThermal (gas) pressure from a hot neutron plasmaDThe strong nuclear force acting attractively at all distances

Astronomy

Astronomy · L5 · Neutron Star Physics

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Astronomy · L5 · Neutron Star Physics

Flowchart11 objects

Astronomy

Astronomy · L1 · The Four Seasons · flowchart

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Astronomy · L1 · The Four Seasons · flowchart

Note~458 words · 2 min

Galactic dynamics: the rotation curve problem and dark matter One of the strongest pieces of evidence for dark matter comes from a straightforward application of Newtonian gravity to how fast stars and gas orbit within galaxies — and the su

Astronomy

Astronomy · L4 · Galactic dynamics: the rotation curve problem and dark matter

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Astronomy · L4 · Galactic dynamics: the rotation curve problem and dark matter

Note~221 words · 1 min

An Invisible Shield The Sun constantly releases a stream of charged particles called the solar wind. If it hit Earth's atmosphere unopposed, it could gradually strip the atmosphere away over billions of years — something scientists think ha

Astronomy

Astronomy · L2 · Auroras and Earth's Magnetosphere

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Astronomy · L2 · Auroras and Earth's Magnetosphere

Collection4 items

01Astronomy · L3 · Exoplanet Detection

02Astronomy · L3 · Exoplanet Detection

03Astronomy · L3 · Choosing an Exoplanet Detection Method

+1 more

Astronomy

Astronomy · L3 · Exoplanet Detection

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Astronomy · L3 · Exoplanet Detection

Flowchart20 objects

Astronomy

Astronomy · L5 · Hierarchical Halo Assembly and Galaxy Growth

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Astronomy · L5 · Hierarchical Halo Assembly and Galaxy Growth

Flowchart12 objects

Astronomy

Astronomy · L4 · Gravitational lensing in practice: cluster mass mapping and time-delay cosmography · flowchart

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Astronomy · L4 · Gravitational lensing in practice: cluster mass mapping and time-delay cosmography · flowchart

Note~240 words · 1 min

A Magnetic Shield in a Charged Wind The Sun constantly sheds the solar wind — a stream of protons and electrons moving fast enough to escape its gravity. Earth's magnetic field deflects most of this wind around the planet, carving out a cav

Astronomy

Astronomy · L3 · Aurora & Magnetosphere Physics

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Astronomy · L3 · Aurora & Magnetosphere Physics

Flashcards8 cards

What is an astronaut?1 / 8

A person specially trained to travel and work in space.

Astronomy

Astronomy · L1 · Astronauts

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Astronomy · L1 · Astronauts

Flashcards8 cards

What single spectral feature first splits all supernovae into Type I versus Type II?1 / 8

The presence or absence of hydrogen lines in the supernova's spectrum near peak brightness. A Type I supernova shows no hydrogen lines; a Type II supernova does. This purely observational split was defined before the underlying physical mechanisms were fully understood, and it still does not map onto a single explosion mechanism.

Astronomy

Astronomy · L4 · Supernova Classification: Light Curves & Spectral Types

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Astronomy · L4 · Supernova Classification: Light Curves & Spectral Types

Flashcards8 cards

What is recombination, and why is the name slightly misleading?1 / 8

Recombination is the epoch (~380,000 years after the Big Bang, at temperature ~3,000 K) when the universe cooled enough for free electrons and protons to combine into neutral hydrogen atoms. The name is slightly misleading because electrons and protons had never been 'combined' before — the early universe was always a hot, fully ionised plasma prior to this event.

Astronomy

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

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

Flowchart13 objects

Astronomy

Astronomy · L5 · From Leptogenesis to the Observed Baryon Asymmetry

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Astronomy · L5 · From Leptogenesis to the Observed Baryon Asymmetry

Note~335 words · 2 min

From the Overdensity Field to the Correlation Function Large-scale structure is described statistically through the overdensity field δ(x) = [ρ(x) − ρ̄]/ρ̄. Its two-point correlation function ξ(r) is the excess probability, above random Poi

Astronomy

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

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

Quiz5 questions

Which of the following is NOT one of Sakharov's three conditions for baryogenesis?

ABaryon number violationBC and CP violationCDeparture from thermal equilibriumDConservation of lepton number

Astronomy

Astronomy · L5 · Baryogenesis

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Astronomy · L5 · Baryogenesis

Flowchart9 objects

Astronomy

Astronomy · L1 · How an Aurora Forms

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Astronomy · L1 · How an Aurora Forms

Note~321 words · 2 min

The Densest Objects in the Universe When a massive star's core collapses at the end of its life, what it becomes depends on exactly how much mass is left behind: a neutron star, or a black hole. Neutron Stars and Degenerate Matter A neutron

Astronomy

Astronomy · L3 · Black Holes & Neutron Stars

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Astronomy · L3 · Black Holes & Neutron Stars

Note~551 words · 3 min

Binary star systems: the mass-period relation and observational classes Stellar mass cannot be inferred from light alone — a star's luminosity and temperature reveal mass only indirectly, via theoretical stellar models. Binary star systems

Astronomy

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

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

Quiz4 questions

A flat galactic rotation curve (v(r) ≈ constant at large r) implies which mass profile M(r)?

AM(r) is constant beyond the visible diskBM(r) ∝ rCM(r) ∝ r²DM(r) ∝ 1/r

Astronomy

Astronomy · L5 · Dark Matter Candidates and Evidence

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Astronomy · L5 · Dark Matter Candidates and Evidence

Flowchart9 objects

Astronomy

Astronomy · L1 · Solar Eclipse vs Lunar Eclipse

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Astronomy · L1 · Solar Eclipse vs Lunar Eclipse

Collection3 items

01Astronomy · L1 · Astronauts

02Astronomy · L1 · Astronauts

03Astronomy · L1 · Astronauts Quiz

Astronomy

Astronomy · L1 · Astronauts

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Astronomy · L1 · Astronauts

Quiz4 questions

What is the celestial sphere?

AA real physical sphere surrounding EarthBAn imaginary sphere used to map star positions as seen from EarthCThe Sun's outer atmosphereDAnother name for the Milky Way

Astronomy

Astronomy · L2 · Navigating the Night Sky

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Astronomy · L2 · Navigating the Night Sky

Quiz4 questions

What does one astronomical unit (AU) equal?

AThe distance from Earth to the MoonBThe average distance from Earth to the SunCThe width of the Milky WayDThe distance light travels in one year

Astronomy

Astronomy · L2 · The Scale of the Universe

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Astronomy · L2 · The Scale of the Universe

Collection3 items

01Astronomy · L2 · Tides and the Moon's Pull

02Astronomy · L2 · Tides and the Moon's Pull

03Astronomy · L2 · Tides and the Moon's Pull

Astronomy

Astronomy · L2 · Tides and the Moon's Pull

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Astronomy · L2 · Tides and the Moon's Pull

Flowchart11 objects

Astronomy

Astronomy · L2 · Star Clusters · flowchart

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Astronomy · L2 · Star Clusters · flowchart

Collection4 items

01Astronomy · L3 · Galaxy Types & the Milky Way

02Astronomy · L3 · Galaxy Types & the Milky Way

03Astronomy · L3 · The Hubble Classification of Galaxies

+1 more

Astronomy

Astronomy · L3 · Galaxy Types & the Milky Way

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Astronomy · L3 · Galaxy Types & the Milky Way

Note~467 words · 2 min

Stellar kinematics: proper motion, radial velocity, and space velocity A star's true motion through space is a three-dimensional velocity vector, but no single measurement captures all of it directly. Astrometry breaks that velocity into tw

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

Collection3 items

01Astronomy · L2 · Kepler's Laws of Planetary Motion

02Astronomy · L2 · Kepler's Laws of Planetary Motion

03Astronomy · L2 · Kepler's Laws of Planetary Motion

Astronomy

Astronomy · L2 · Kepler's Laws of Planetary Motion

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Astronomy · L2 · Kepler's Laws of Planetary Motion

Flashcards9 cards

What is a protostar?1 / 9

A dense, collapsing clump of gas and dust within a molecular cloud, heating up under its own gravity, but not yet hot enough at its core to sustain hydrogen fusion.

Astronomy

Astronomy · L3 · Stellar Evolution

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Astronomy · L3 · Stellar Evolution

Flashcards7 cards

Which planet is famous for its rings?1 / 7

Saturn — its wide, bright rings make it one of the most recognizable planets.

Astronomy

Astronomy · L1 · Saturn's Rings

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Astronomy · L1 · Saturn's Rings

Note~237 words · 1 min

When Shadows Fall in Space The Sun, Earth, and Moon are always moving. Every so often, they line up almost perfectly in a straight line, and one of them casts a shadow on another. That is an eclipse. Solar Eclipse: The Moon Blocks the Sun A

Astronomy

Astronomy · L1 · Solar and Lunar Eclipses

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Astronomy · L1 · Solar and Lunar Eclipses

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