By Rick Smith On Aug. 26, 1999, NASA’s Chandra X-ray Observatory opened its powerful telescopic eye in orbit and captured its awe-inspiring “first light” images of Cassiopeia A, a supernova remnant roughly 11,000 light-years from Earth. That first observation was far more detailed than anything seen by previous X-ray telescopes, even revealing – for the first […]
Posted on
August 26, 2024
Sign up for our newsletter:
Categories
103
1
1
17
1
39
37
2
1
102
4
4
134
10
12
18
2
89
4
6
15
2
384
6
14
4
18
2
198
17
1
25
1
6
37
8
6
6
1
1
3
11
2
42
17
2
5
10
10
6
103
43
6
1
11
10
33
2
2
1
3
149
2
3
1
11
3
32
3
28
108
65
2
4
1
3
1
14
29
1
12
43
5
1
1
13
1
1
1
10
14
6
1
11
11
3
1
2
40
107
1
263
157
10
54
1
32
171
356
2
3
121
1
1
2
1
10
59
26
221
8
134
1
10
1
10
10
2
4
1
32
20
346
4
625
1
1
291
3
1
1
1
1
1
212
346
1
4
20
17
29
10
1
1
1
1
25
1
149
2
10
1
18
52
1
41
196
23
5
6
1
2
370
44
3
1
15
51
3
24
13
1
18
10
14