Difference between revisions of "January 13"
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[[1942]] – A test [[pilot]] becomes the first person to escape from a stricken aircraft with an ejection seat. <br> | [[1942]] – A test [[pilot]] becomes the first person to escape from a stricken aircraft with an ejection seat. <br> | ||
[[1993]] – Endeavour heads for space for the third time as STS-54 launches from the Kennedy Space Center. <br> | [[1993]] – Endeavour heads for space for the third time as STS-54 launches from the Kennedy Space Center. <br> | ||
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| + | <center>'''Fun Fact:''' <br> | ||
| + | Some large telescopes use liquid mercury as a reflective mirror instead of glass. <br> | ||
| + | The rotating liquid assumes the parabolic shape regardless of the container's shape and it costs much lower than traditional glass mirrors. | ||
| + | </center> | ||
<noinclude>[[Category:On This Day|013]]</noinclude> | <noinclude>[[Category:On This Day|013]]</noinclude> | ||
Revision as of 02:47, 1 December 2022
1610 – Galileo Galilei discovers Ganymede, 4th moon of Jupiter.
1942 – A test pilot becomes the first person to escape from a stricken aircraft with an ejection seat.
1993 – Endeavour heads for space for the third time as STS-54 launches from the Kennedy Space Center.
Some large telescopes use liquid mercury as a reflective mirror instead of glass.
The rotating liquid assumes the parabolic shape regardless of the container's shape and it costs much lower than traditional glass mirrors.
