6月17日图
for傻欢
On June 17 in 1999
Stephan's Quintet
This close-up shows four of the five galaxies that make up Stephan’s Quintet. The image reveals bright, blue clusters of stars, born from the violent interactions between some of the member galaxies.

我先上课，2小时后接着发图~~

12月28日图
On December 28 in 1997
Galaxy I Zwicky 18
This image captures the irregular dwarf galaxy I Zwicky 18 and a companion galaxy to its upper right. The two galaxies are interacting, triggering star formation in I Zwicky 18.

2月12日图
On February 12 in 2018
Lagoon Nebula
This image zooms into the heart of a vast star-forming region called the Lagoon Nebula. A massive young star at the center of the image is blasting radiation and stellar winds, carving shapes into the surrounding gas and dust.

9月16日图
for托妞
On September 16 in 1997
Beta Pictoris Disk
In 1984, Beta Pictoris was the very first star discovered to be surrounded by a bright disk of light-scattering dust and debris. Planets are thought to form in such disks, and astronomers have discovered two planets orbiting Beta Pictoris.

5月4日图
for北七
On May 4 in 2002
Cat's Eye Nebula
Produced by a dying star, the Cat's Eye Nebula is one of the most complex planetary nebulas known. This image reveals a pattern of concentric rings around the central star. Each "ring" is actually the edge of a spherical bubble of material ejected by the star.

8月2日（p1）、12月18日（p2）图
for木羽
On August 2 in 1997
Hubble-V Nebula
Hubble-V is an active star-forming region within galaxy NGC 6822. The cloud is about 200 light-years across and contains a dense knot of dozens of ultra-hot stars, each 100,000 times brighter than our Sun.
On December 18 in 1995
Hubble Deep Field
Called the Hubble Deep Field, this image captures several hundred galaxies that had never been seen before. Some galaxies are near and some are very far. Their various shapes and colors provide clues about the evolution of the universe.

3月15日（p1）3月31日（p2）图
for频频
On March 15 in 1999
Interacting Galaxies Arp 81
Arp 81 is a pair of interacting galaxies consisting of NGC 6621 (center) and NGC 6622 (left). The encounter has pulled a long tail out of NGC 6621 that has now wrapped behind the pair.
On March 31 in 1997
Interacting Galaxies AM 0500-620
AM 0500-620 includes a pair of galaxies, with one spiral galaxy seen nearly face-on that is partially backlit by a background galaxy. These interacting galaxies are located 350 million light-years away in the constellation Dorado.

5月10日图
for艾初
On May 10 in 2008
Red Spots on Jupiter
This image captures three red spots in Jupiter's atmosphere. The famous Great Red Spot appears on the right, while "Red Spot Jr." is to the lower left and an even smaller "baby red spot" appears at left.

7月28日图
for阿愚
On July 28 in 2017
Triangulum Galaxy
This mosaic captures the nearby Triangulum galaxy. Striking areas of star birth glow bright blue throughout the galaxy, particularly in beautiful nebulas of hot gas like star-forming region NGC 604 in the upper left.

9月21日图
for芝麻
On September 21 in 2004
GOODS South Field
More than 12 billion years of cosmic history are shown in this panoramic view of thousands of galaxies in various stages of assembly. The view covers a portion of the southern field of a galaxy census called the Great Observatories Origins Deep Survey (GOODS).

4月9日（p1）4月13日（p2）图
for芊芊
On April 9 in 2007
Jupiter and Ganymede
This image shows Jupiter and its large moon Ganymede as the moon peeks out from behind the planet. Composed of rock and ice, Ganymede is the largest moon in our solar system.
On April 13 in 2011
Galaxy Cluster Abell 2261
The giant elliptical galaxy in the center of this image is the most massive and brightest member of galaxy cluster Abell 2261. More than a million light-years wide, the galaxy is about 10 times bigger than our Milky Way galaxy.

5月24日图
for憨花
On May 24 in 2013
Galaxy Cluster Abell 2744
Located 3.5 billion light-years away, Abell 2744 contains several hundred galaxies and might be a pile-up of at least four smaller galaxy clusters. Abell 2744’s strong gravitational field acts as a lens, brightening and magnifying the light of nearly 3,000 distant background galaxies.