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Astronomy: explore STEM content (page 18 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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Note~530 words · 3 min

Active galactic nuclei: accretion disks, jets, and supermassive black holes At the centre of most large galaxies sits a supermassive black hole (SMBH), typically millions to billions of solar masses. Most of the time this SMBH is quiescent,

Astronomy

Astronomy · L4 · Active galactic nuclei: accretion disks, jets, and supermassive black holes

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Astronomy · L4 · Active galactic nuclei: accretion disks, jets, and supermassive black holes

Flowchart8 objects

Astronomy

Astronomy · L1 · Artemis: Returning to the Moon · flowchart

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Astronomy · L1 · Artemis: Returning to the Moon · flowchart

Flashcards9 cards

State Kepler's First Law.1 / 9

Every planet's orbit is an ellipse, with the Sun at one of the two foci — not at the centre of the ellipse.

Astronomy

Astronomy · L3 · Kepler's Laws & Orbital Mechanics

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Astronomy · L3 · Kepler's Laws & Orbital Mechanics

Quiz6 questions

Where is the asteroid belt located?

ABeyond NeptuneBBetween Mars and JupiterCBetween Earth and MarsDAround the Sun's poles

Astronomy

Astronomy · L2 · The Asteroid Belt and Kuiper Belt Quiz

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Astronomy · L2 · The Asteroid Belt and Kuiper Belt Quiz

Flowchart12 objects

Astronomy

Astronomy · L5 · Ultra-High-Energy Cosmic Rays & the GZK Cutoff · flowchart

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Astronomy · L5 · Ultra-High-Energy Cosmic Rays & the GZK Cutoff · flowchart

Note~180 words · 1 min

Leftovers From Building the Solar System Not everything in space is a planet, a moon, or a star. Space is full of smaller rocky and icy objects — leftover pieces from when the solar system was forming billions of years ago. How a Comet Grow

Astronomy

Astronomy · L1 · Asteroids, Comets, and Meteors

@openstem

Astronomy · L1 · Asteroids, Comets, and Meteors

Flashcards8 cards

State the (static, non-expanding) Jeans instability criterion and the Jeans length.1 / 8

In a static self-gravitating gas, pressure support competes with gravity; a perturbation collapses only if it is larger than the Jeans length, at which pressure forces can no longer respond fast enough to counteract gravitational collapse:

Astronomy

Astronomy · L5 · Cosmological Perturbation Theory

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Astronomy · L5 · Cosmological Perturbation Theory

Quiz4 questions

What is a constellation?

AA single very bright starBA pattern of stars that forms a picture in the skyCA type of planetDA cloud of dust

Astronomy

Astronomy · L1 · Stars and Constellations Quiz

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Astronomy · L1 · Stars and Constellations Quiz

Note~232 words · 1 min

Kilometres Stop Being Useful A kilometre works fine for measuring a road trip. But space is so vast that using kilometres for it quickly produces numbers too large to picture — hence astronomers use two special units built for the job. Stac

Astronomy

Astronomy · L2 · The Scale of the Universe

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Astronomy · L2 · The Scale of the Universe

Flowchart7 objects

Astronomy

Astronomy · L1 · Neptune and Uranus, the Ice Giants · flowchart

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Astronomy · L1 · Neptune and Uranus, the Ice Giants · flowchart

Quiz4 questions

Since when has the International Space Station been continuously crewed?

A1969B2000C2021D1957

Astronomy

Astronomy · L2 · Modern Space Missions and Rovers

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Astronomy · L2 · Modern Space Missions and Rovers

Flashcards8 cards

Who first suggested that the Sun, not Earth, is the center of the solar system?1 / 8

Nicolaus Copernicus.

Astronomy

Astronomy · L1 · Astronomers Who Changed How We See the Sky

@openstem

Astronomy · L1 · Astronomers Who Changed How We See the Sky

Collection4 items

01Astronomy · L5 · Dark Matter Candidates and Evidence

02Astronomy · L5 · Dark Matter: Evidence and Candidate Particles

03Astronomy · L5 · Evidence for Dark Matter and Candidate Particles

+1 more

Astronomy

Astronomy · L5 · Dark Matter Candidates and Evidence

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Astronomy · L5 · Dark Matter Candidates and Evidence

Quiz7 questions

What spectral feature first splits supernovae into Type I versus Type II?

AThe presence or absence of hydrogen linesBThe total explosion energyCThe host galaxy's distanceDThe presence or absence of iron lines

Astronomy

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

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

Flowchart16 objects

Astronomy

Astronomy · L3 · Assessing an Asteroid Impact Hazard

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Astronomy · L3 · Assessing an Asteroid Impact Hazard

Quiz5 questions

Venus, Earth, and Mars formed in roughly the same region of the solar system from similar materials. What does comparative planetology try to explain?

AWhy they ended up so different despite similar starting pointsBWhy all three planets are actually identicalCHow many moons each planet hasDThe exact order the planets formed in

Astronomy

Astronomy · L2 · Comparative Planetology

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Astronomy · L2 · Comparative Planetology

Flowchart19 objects

Astronomy

Astronomy · L5 · Neutron Star Merger to Kilonova and Multi-Messenger Detection

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Astronomy · L5 · Neutron Star Merger to Kilonova and Multi-Messenger Detection

Flashcards8 cards

What happens in the Sun's core?1 / 8

Nuclear fusion — hydrogen nuclei fuse into helium under crushing pressure and heat of about 15 million °C, releasing the energy that powers the entire Sun.

Astronomy

Astronomy · L2 · The Sun's Structure and Activity

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Astronomy · L2 · The Sun's Structure and Activity

Flowchart13 objects

Astronomy

Astronomy · L2 · How Star Clusters Form and Change Over Time

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Astronomy · L2 · How Star Clusters Form and Change Over Time

Quiz4 questions

The vis-viva equation v² = GM(2/r − 1/a) shows that, for a fixed semi-major axis a, orbital speed v is:

AConstant everywhere along the orbitBLargest when r is smallest (near periapsis)CLargest when r is largest (near apoapsis)DIndependent of r entirely

Astronomy

Astronomy · L4 · Orbital Mechanics: Vis-Viva & Hohmann Transfers — 4 Q

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Astronomy · L4 · Orbital Mechanics: Vis-Viva & Hohmann Transfers — 4 Q

Flowchart7 objects

Astronomy

Astronomy · L2 · Dwarf Planets and the Kuiper Belt · flowchart

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Astronomy · L2 · Dwarf Planets and the Kuiper Belt · flowchart

Flowchart10 objects

Astronomy

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

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

Collection7 items

01Astronomy · L1 · Planets in Our Solar System

02Astronomy · L1 · Day and Night

03Astronomy · L1 · The Eight Planets in Order

+4 more

Astronomy

Astronomy · L1 · Sky, Seasons & Planets

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Astronomy · L1 · Sky, Seasons & Planets

Flowchart9 objects

Astronomy

Astronomy · L1 · Why Jupiter Looks the Way It Does

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Astronomy · L1 · Why Jupiter Looks the Way It Does

Quiz4 questions

Why do astronauts wear spacesuits outside their spacecraft?

ATo look impressiveBBecause there is no air to breathe and extreme temperatures outsideCTo swim more easilyDSpacesuits are not actually needed

Astronomy

Astronomy · L1 · Astronauts Quiz

@openstem

Astronomy · L1 · Astronauts Quiz

Collection4 items

01Astronomy · L1 · Mars Exploration

02Astronomy · L1 · Mars Exploration

03Astronomy · L1 · A Mars Rover Mission, Step by Step

+1 more

Astronomy

Astronomy · L1 · Mars Exploration

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Astronomy · L1 · Mars Exploration

Flashcards9 cards

What are the two main classes of stellar oscillation modes, and what restoring force distinguishes each?1 / 9

Pressure modes (p-modes) are acoustic waves restored by pressure gradients — essentially trapped sound waves. Gravity modes (g-modes) are restored by buoyancy in a stably (radiatively) stratified region, oscillating as displaced fluid parcels are pushed back toward equilibrium by their density contrast with the surroundings.

Astronomy

Astronomy · L4 · Asteroseismology: Probing Stellar Interiors

@openstem

Astronomy · L4 · Asteroseismology: Probing Stellar Interiors

Flashcards8 cards

What is an asteroid?1 / 8

A rocky object that orbits the Sun, smaller than a planet.

Astronomy

Astronomy · L1 · Asteroids, Comets, and Meteors

@openstem

Astronomy · L1 · Asteroids, Comets, and Meteors

Collection4 items

01Astronomy · L1 · Northern Lights (Auroras)

02Astronomy · L1 · Northern Lights (Auroras)

03Astronomy · L1 · How an Aurora Forms

+1 more

Astronomy

Astronomy · L1 · Northern Lights (Auroras)

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Astronomy · L1 · Northern Lights (Auroras)

Note~268 words · 1 min

Falling Around, Not Falling In It seems strange that gravity pulls planets toward the Sun all the time, yet they never crash into it. The trick is that planets are also moving sideways, fast. Gravity bends that sideways motion into a curve

Astronomy

Astronomy · L2 · Gravity and Orbital Motion

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Astronomy · L2 · Gravity and Orbital Motion

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