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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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Astronomy: explore STEM content (page 20 of 26) · openstem

Collection4 items

01Astronomy · L3 · Stellar Evolution

02Astronomy · L3 · Stellar Evolution

03Astronomy · L3 · Stellar Evolution by Initial Mass

+1 more

Astronomy

Astronomy · L3 · Stellar Evolution

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Astronomy · L3 · Stellar Evolution

Flowchart7 objects

Astronomy

Astronomy · L5 · Pulsar Timing Arrays and the Nanohertz Gravitational-Wave Background · flowchart

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Astronomy · L5 · Pulsar Timing Arrays and the Nanohertz Gravitational-Wave Background · flowchart

Flowchart13 objects

Astronomy

Astronomy · L2 · From Solar Wind to Aurora

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Astronomy · L2 · From Solar Wind to Aurora

Flowchart7 objects

Astronomy

Astronomy · L1 · Rockets · flowchart

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Astronomy · L1 · Rockets · flowchart

Quiz5 questions

Why does every element produce its own unique pattern of spectral lines?

ABecause each element has a different colourBBecause each element's electrons can only occupy specific, fixed energy levelsCBecause elements absorb all wavelengths equallyDIt is random and has no physical cause

Astronomy

Astronomy · L3 · Spectroscopy & Redshift

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Astronomy · L3 · Spectroscopy & Redshift

Quiz4 questions

What is the International Space Station?

AA satellite with no crewBA giant orbiting spacecraft where astronauts live and workCA telescope on the MoonDA weather balloon

Astronomy

Astronomy · L1 · The Space Station Quiz

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Astronomy · L1 · The Space Station Quiz

Flowchart18 objects

Astronomy

Astronomy · L5 · Cosmological Perturbation Theory: From Jeans Instability to Structure Growth · flowchart

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Astronomy · L5 · Cosmological Perturbation Theory: From Jeans Instability to Structure Growth · flowchart

Quiz4 questions

Why is Mars called the 'Red Planet'?

AIt is covered in red lavaBRusted iron-rich dust covers its surfaceCIts atmosphere is redDIt reflects red light from the Sun

Astronomy

Astronomy · L1 · Mars Exploration Quiz

@openstem

Astronomy · L1 · Mars Exploration Quiz

Flowchart11 objects

Astronomy

Astronomy · L2 · Gravity and Orbital Motion · flowchart

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Astronomy · L2 · Gravity and Orbital Motion · flowchart

Collection3 items

01Astronomy · L3 · Newtonian Gravitation

02Astronomy · L3 · Newtonian Gravitation

03Astronomy · L3 · Newtonian Gravitation

Astronomy

Astronomy · L3 · Newtonian Gravitation

@openstem

Astronomy · L3 · Newtonian Gravitation

Note~218 words · 1 min

Exploration Didn't Stop with Apollo After the Apollo Moon landings ended in 1972, human and robotic space exploration didn't stop — it shifted focus. Today's missions range from a permanently crewed station in orbit to robotic rovers crawli

Astronomy

Astronomy · L2 · Modern Space Missions and Rovers

@openstem

Astronomy · L2 · Modern Space Missions and Rovers

Flashcards8 cards

What is the magnetosphere?1 / 8

The region of space around Earth dominated by Earth's magnetic field, shaped into a teardrop by the solar wind: compressed on the sunward side, stretched into a long magnetotail on the night side.

Astronomy

Astronomy · L3 · Aurora & Magnetosphere Physics

@openstem

Astronomy · L3 · Aurora & Magnetosphere Physics

Flashcards8 cards

State Newton's law of universal gravitation.1 / 8

Every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to the square of the distance between them:

Astronomy

Astronomy · L3 · Newtonian Gravitation

@openstem

Astronomy · L3 · Newtonian Gravitation

Flowchart17 objects

Astronomy

Astronomy · L5 · s-process or r-process?

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Astronomy · L5 · s-process or r-process?

Flashcards8 cards

What does 'hierarchical' structure formation mean, and why is it 'bottom-up'?1 / 8

In a Cold Dark Matter (CDM) universe, small-scale density perturbations grow and collapse first (they cross the non-linear threshold δ~1 earliest, since smaller scales have larger fractional fluctuations in a nearly scale-invariant primordial spectrum), forming small dark matter halos. These small halos then merge over cosmic time to build progressively larger structures — galaxies, groups, and eventually galaxy clusters. This 'small structures form first, then merge into larger ones' pattern is the opposite of a hypothetical 'top-down' scenario (large structures forming first and fragmenting), and CDM's bottom-up hierarchy is well supported by observations.

Astronomy

Astronomy · L5 · Hierarchical Galaxy Formation

@openstem

Astronomy · L5 · Hierarchical Galaxy Formation

Flashcards8 cards

Which planet is the biggest in our Solar System?1 / 8

Jupiter — it is so big that more than 1,000 Earths could fit inside it.

Astronomy

Astronomy · L1 · Jupiter, the Giant Planet

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Astronomy · L1 · Jupiter, the Giant Planet

Flowchart10 objects

Astronomy

Astronomy · L2 · The Copernican Revolution · flowchart

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Astronomy · L2 · The Copernican Revolution · flowchart

Flowchart11 objects

Astronomy

Astronomy · L2 · Modern Space Missions and Rovers · flowchart

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Astronomy · L2 · Modern Space Missions and Rovers · flowchart

Note~160 words · 1 min

A Twin in Size Only Venus is nearly the same size as Earth and made of similar rock, which is why scientists sometimes call it Earth's 'twin'. But that's where the similarity ends. Why So Hot? Venus is not the closest planet to the Sun, yet

Astronomy

Astronomy · L1 · Venus, Earth's Unfriendly Twin

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Astronomy · L1 · Venus, Earth's Unfriendly Twin

Collection4 items

01Astronomy · L3 · Gravitational Lensing

02Astronomy · L3 · Gravitational Lensing

03Astronomy · L3 · Strong Lensing or Weak Lensing?

+1 more

Astronomy

Astronomy · L3 · Gravitational Lensing

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Astronomy · L3 · Gravitational Lensing

Flashcards5 cards

How many planets are in our solar system?1 / 5

There are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto is now called a dwarf planet.

Astronomy

Astronomy · L1 · Planets in Our Solar System

@openstem

Astronomy · L1 · Planets in Our Solar System

Collection3 items

01Astronomy · L4 · Gravitational Lensing as a Quantitative Astrophysical Tool

02Astronomy · L4 · Gravitational lensing in practice: cluster mass mapping and time-delay cosmography

03Astronomy · L4 · Gravitational Lensing & Time-Delay Cosmography — 5 Q

Astronomy

Astronomy · L4 · Gravitational Lensing as a Quantitative Astrophysical Tool

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Astronomy · L4 · Gravitational Lensing as a Quantitative Astrophysical Tool

Flashcards8 cards

What is a 'moon phase'?1 / 8

A moon phase is the shape of the sunlit part of the Moon that we can see from Earth.

Astronomy

Astronomy · L1 · The Changing Moon

@openstem

Astronomy · L1 · The Changing Moon

Collection3 items

01Astronomy · L3 · Stellar Classification

02Astronomy · L3 · Stellar Classification

03Astronomy · L3 · Stellar Classification

Astronomy

Astronomy · L3 · Stellar Classification

@openstem

Astronomy · L3 · Stellar Classification

Flashcards8 cards

Write the parallax distance formula and define its terms.1 / 8

d (pc) = 1/p (arcsec), where p is the parallax angle in arcseconds and d is distance in parsecs. This defines the parsec itself: 1 parsec is the distance at which a star shows a parallax angle of exactly 1 arcsecond as Earth orbits the Sun.

Astronomy

Astronomy · L4 · The Cosmic Distance Ladder, Quantitatively

@openstem

Astronomy · L4 · The Cosmic Distance Ladder, Quantitatively

Note~548 words · 3 min

The interstellar medium: gas, dust, the 21 cm line, and extinction The space between stars is not empty. It is filled with a diffuse, multi-phase mixture of gas and dust — the interstellar medium (ISM) — that shapes star formation, alters t

Astronomy

Astronomy · L4 · The interstellar medium: gas, dust, the 21 cm line, and extinction

@openstem

Astronomy · L4 · The interstellar medium: gas, dust, the 21 cm line, and extinction

Quiz4 questions

What physically defines the tidal radius r_t of a star approaching a black hole?

AThe distance at which the star crosses the black hole's photon sphereBThe distance at which the black hole's differential gravity across the star exceeds the star's self-gravityCThe distance at which the star's orbital velocity equals the speed of lightDThe distance at which the accretion disk becomes optically thick

Astronomy

Astronomy · L5 · Tidal Disruption Events

@openstem

Astronomy · L5 · Tidal Disruption Events

Flashcards8 cards

What is a satellite?1 / 8

Any object that orbits, or travels around, a larger object in space.

Astronomy

Astronomy · L1 · Satellites: Natural & Artificial

@openstem

Astronomy · L1 · Satellites: Natural & Artificial

Note~464 words · 2 min

Radio interferometry: from single dishes to the Event Horizon Telescope Radio astronomy faces a resolution problem optical astronomy does not: radio wavelengths are so much longer than visible light that a single dish would need to be impra

Astronomy

Astronomy · L4 · Radio interferometry: from single dishes to the Event Horizon Telescope

@openstem

Astronomy · L4 · Radio interferometry: from single dishes to the Event Horizon Telescope

Flowchart9 objects

Astronomy

Astronomy · L4 · Exoplanet atmospheres: transmission spectroscopy and the habitable zone · flowchart

@openstem

Astronomy · L4 · Exoplanet atmospheres: transmission spectroscopy and the habitable zone · flowchart

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