Message boards :
Science (non-SETI) :
Space Exploration News
Message board moderation
Previous · 1 · 2 · 3 · 4 · 5 . . . 27 · Next
Author | Message |
---|---|
Stargate (SA) Send message Joined: 4 Mar 10 Posts: 1854 Credit: 2,258,721 RAC: 0 |
Anyone know what the size comparison of Tiangong-1 with Skylab? What I found is Tiangong-1 is much smaller than Skylab.. |
moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 |
Anyone know what the size comparison of Tiangong-1 with Skylab? The weight of Skylab was 77 tonnes. https://en.wikipedia.org/wiki/Skylab Tiangong-1's weight is 8.5 tonnes. https://en.wikipedia.org/wiki/Tiangong-1 |
Stargate (SA) Send message Joined: 4 Mar 10 Posts: 1854 Credit: 2,258,721 RAC: 0 |
Anyone know what the size comparison of Tiangong-1 with Skylab? Ta muchly :) |
moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 |
Anyone know what the size comparison of Tiangong-1 with Skylab? As a comparision, IIS's weight is more than 420 tonnes and it will fall back to earth in about 2024 when the project shut down. |
Wiggo Send message Joined: 24 Jan 00 Posts: 34744 Credit: 261,360,520 RAC: 489 |
See China's space station death-dive live via telescope. China's Tiangong-1 space station isn't long for this orbit.Cheers. |
Wiggo Send message Joined: 24 Jan 00 Posts: 34744 Credit: 261,360,520 RAC: 489 |
Astronomers baffled by distant galaxy void of dark matter. Astronomers have found a distant galaxy where there is no dark matter.Cheers. |
Pierre A Renaud Send message Joined: 3 Apr 99 Posts: 998 Credit: 9,101,544 RAC: 65 |
Asteroid-bound spacecraft finds signs of life—on Earth by Katherine Kornei, Mar. 26, 2018 http://www.sciencemag.org/news/2018/03/asteroid-bound-spacecraft-finds-signs-life-earth Nearly 30 years ago, the Galileo spacecraft flew past Earth on its journey to Jupiter, prompting astronomer Carl Sagan to develop a novel experiment: to look for signs of life on Earth from space. The spacecraft found high levels of methane and oxygen, suggestions that photosynthesis was occurring on Earth’s surface. Now, astronomers have repeated the experiment, this time with an asteroid-bound spacecraft that swung around Earth in late 2017. It also found Earth to be teeming with life, but with an unsettling corollary: Atmospheric levels of carbon dioxide and methane were far higher than they were during the Galileo flyby. https://www.nasa.gov/osiris-rex https://www.asteroidmission.org/ https://www.asteroidmission.org/why-bennu https://solarsystem.nasa.gov/missions/galileo/in-depth/ Apr 3, 1999 - May 3, 2020 |
moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 |
Searching for planets having atmospheric oxygen is good start to search for extraterrestrial life. But it is a bit of a disappointment that oxygen in a planet's atmosphere does not have to be a sign of life. http://www.manyworlds.space/index.php/2018/01/29/false-positives-false-negatives-the-world-of-distant-biosignatures-attracts-and-confounds/ The most often discussed biosignature is oxygen, the product of life on Earth. But while oxygen remains central to the search for biosignatures afar, there are some serious problems with relying on that molecule. |
Wiggo Send message Joined: 24 Jan 00 Posts: 34744 Credit: 261,360,520 RAC: 489 |
NASA's New Parker Probe Will Skim the Sun's Surface. Early on Easter Sunday, around 4 am local time, a C-17 transport plane carrying a cargo worth $1.5 billion will take off from Joint Base Andrews near Washington, DC, and head south to Cape Canaveral. On board, a carefully wrapped and padded spacecraft headed for a rendezvous with the sun.Cheers. |
Michael Watson Send message Joined: 7 Feb 08 Posts: 1383 Credit: 2,098,506 RAC: 5 |
How can we avoid a 'false positive' for the detection of life on a planet, where oxygen is concerned? One way has been discussed scientifically. If both oxygen and methane are detected, the chances are much better that life is the source. On an Earth-like planet, where we would be looking for life in the first place, the presence of methane suggests microorganisms, while oxygen hints at photosynthetic plants. The likelihood of both gases occurring together, exclusive of life is considered low. As far as we know, only life can maintain a continuous supply of and ozone, an unstable form of oxygen, and methane, also unstable over time. |
tullio Send message Joined: 9 Apr 04 Posts: 8797 Credit: 2,930,782 RAC: 1 |
The European Space Agency has decided to build ARIEL, a spacecraft for analyzing the atmosphere of exoplanets. It should be launched in 2028. Tullio |
moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 |
If both oxygen and methane are detected, the chances are much better that life is the source. True. But oxygen in gaseous form is very rare on celestial bodies like planets, moons and comets whereas methane is very common. At very least in our solar system. The likelihood of both gases occurring together, exclusive of life is considered low.I don't think anyone can draw that conclusion. Until the 90's no one even could say that exoplanets existed for certain. |
Pierre A Renaud Send message Joined: 3 Apr 99 Posts: 998 Credit: 9,101,544 RAC: 65 |
#LiveTracking of the 8.5 metric tons uncontrolled #Tiangong1 Space Station atmospheric reentry http://www.satflare.com/track.asp?q=37820#TOP http://www.n2yo.com/?s=37820 Depending on the source, its reentry is predicted to happen sometime between saturday March 31 am and sunday April 1st pm EDT (UTC+5hrs). ESA's reentry updates http://blogs.esa.int/rocketscience/ Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR https://twitter.com/Fraunhofer_FHRe #Tiangong1 Twitter feed: https://twitter.com/search?q=%23Tiangong1&src=tyah Chinese Space Station's Crash to Earth: Everything You Need to Know https://www.space.com/40076-chinese-space-station-crash-to-earth-guide.html https://en.wikipedia.org/wiki/Tiangong-1 Radar image video of #Tiangong1 https://twitter.com/Fraunhofer_FHRe/status/978616595609157635 Europe’s space freighter ATV Jules Verne burning up over an uninhabited area of the Pacific Ocean at the end of its mission (2008) https://www.youtube.com/watch?v=OhBw5yaR_SU Apr 3, 1999 - May 3, 2020 |
Bob DeWoody Send message Joined: 9 May 10 Posts: 3387 Credit: 4,182,900 RAC: 10 |
I just hope the Chinese don't try to take pot shots at it like they have done with previous satellites. Bob DeWoody My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events. |
moomin Send message Joined: 21 Oct 17 Posts: 6204 Credit: 38,420 RAC: 0 |
Tiangong-1 is currently predicted to reenter the Earth’s atmosphere around 23:25 UTC on 1 April, and running from the afternoon of 1 April to the early morning on 2 April. This remains highly variable. http://blogs.esa.int/rocketscience/2018/03/26/tiangong-1-reentry-updates/ |
Dr Who Fan Send message Joined: 8 Jan 01 Posts: 3193 Credit: 715,342 RAC: 4 |
|
Pierre A Renaud Send message Joined: 3 Apr 99 Posts: 998 Credit: 9,101,544 RAC: 65 |
Update 1 April 2018 With the latest available orbital data and space-weather forecasts, the reentry prediction window has stabilised and shrunk further to a time frame running from midnight 1 April to the early morning of 2 April (in UTC time). Tiangong-1 is currently predicted to reenter the Earth’s atmosphere around 23:25 UTC on 1 April, and running from the afternoon of 1 April to the early morning on 2 April. This remains highly variable. Apr 3, 1999 - May 3, 2020 |
Lynn Send message Joined: 20 Nov 00 Posts: 14162 Credit: 79,603,650 RAC: 123 |
China's Tiangong-1 space lab re-entered the Earth's atmosphere around 8.15 a.m. Monday (8:15 p.m. ET Sunday) in a fiery fall, China's Manned Space Agency said. Tiangong-1 plummeted into the middle of the South Pacific, the space agency said. "Most parts were burned up in the re-entry process," the agency said. |
Wiggo Send message Joined: 24 Jan 00 Posts: 34744 Credit: 261,360,520 RAC: 489 |
Center Of The Milky Way Has Thousands Of Black Holes, Study Shows. The supermassive black hole lurking at the center of our galaxy appears to have a lot of company, according to a new study that suggests the monster is surrounded by about 10,000 other black holes.Cheers. |
Wiggo Send message Joined: 24 Jan 00 Posts: 34744 Credit: 261,360,520 RAC: 489 |
Virgin Galactic conducts first rocket-powered test since 2014 crash. Around 8 a.m., the company tweeted that mother ship VMS Eve and the attached VSS Unity had taken off. About an hour after liftoff, Virgin Galactic tweeted that VSS Unity separated cleanly from the larger plane and that its two pilots later propelled the spaceship upward by igniting its rocket motor for a “planned partial duration burn.â€Cheers. |
©2024 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.