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Shape of the universe

Diagram showing that an open universe appears saddle shaped, a flat universe appears flat, and a closed universe appears to be spherical.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA & NASA/Hubble
Licence: Public domain
Link to high-res image

Expanding universe

Plot of distance against recession velocity, where galaxies form an approximate straight line at a 45-degree angle.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA
Licence: Public domain
Link to high-res image

Shadows and latitude

Diagram showing the effects of a spherical Earth.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA
Licence: Public domain
Link to high-res image

Sun’s orbit

Diagram showing that the Sun moves up and down with respect to the Galactic disc.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA/CXC/M.Weiss
Licence: Public domain
Link to high-res image

Mars landing-sites

Map of Mars, with landing sites marked.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA/AFP
Licence: Public domain
Link to high-res image

White dwarf size

Diagram showing that white dwarfs are typically not much larger than the Earth.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA
Licence: Public domain
Link to high-res image

Oblate Earth

Photograph of the Earth from space. The polar diameter is labelled 12,720 km, and the equatorial diameter 12,756 km.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA
Licence: Public domain
Link to high-res image

Dwarf planets

Diagram showing Eris and Pluto are slightly smaller than the Moon, and Ceres and Charon are about half the size of Eris and Pluto.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA
Licence: Public domain
Link to high-res image

Superclusters

Labelled diagram of local superclusters showing the position of the Laniakea Supercluster.

Original picture with caption
Image credit: modified by Helen Klus, original image by Andrew Z. Colvin
Licence: CC-SA
Link to high-res image

Time zones

Diagram showing that the time on Earth depends on where you are relative to the Sun.

Original picture with caption
Image credit: modified by Helen Klus, original images by NASA & Dnu72; 12:00, 3:00, 6:00, and 9:00
Licence: CC-SA
Link to high-res image

Verge and foliot

Labelled diagram of a verge and foliot escapement mechanism.

Original picture with caption
Image credit: modified by Helen Klus, original image by Pierre Dubois
Licence: Public domain
Link to high-res image

Distance for 20px image

Diagram showing the distance that different spacecraft would have to be for Hubble to take a 20 pixel wide image of them. The Enterprise from both Star Trek series’ would only be visible from within the orbit of the Moon.

Original picture with caption
Image credit: modified by Helen Klus, original image by NASA/Ernie Wright
Licence: Public domain
Link to high-res image

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