Illustration of the OSIRIS-REx pattern return capsule passing by way of Earth’s ambiance
NASA Goddard Space Flight Center/CI Lab
Bits of the asteroid Bennu are coming again to Earth. NASA’s OSIRIS-REx spacecraft took samples of the asteroid in 2020 that are scheduled to arrive on Earth on 24 September.
OSIRIS-REx launched in 2016 and entered orbit round Bennu in 2018. Scientists selected Bennu as a goal primarily as a result of of its comparatively small distance from Earth – at the time of launch, it was about 225 million kilometres away, and in the intervening years it obtained as shut as 50 million kilometres from Earth.
Because of its common shut approaches, Bennu is thought of a near-Earth object (NEO). It’s not anticipated to smash into our planet anytime quickly, however there is about a 0.057 per cent likelihood of a collision in the subsequent 300 years. Bennu is about 490 metres throughout, so if it did crash into Earth it could trigger important injury.
One cause to research Bennu is to determine how to defend Earth from it and related asteroids. But one other is that it is one of the most primitive area rocks we all know of. “Asteroids like Bennu are time capsules from the early solar system, debris that’s left over from the formation of the solar system,” says Anjani Polit at the University of Arizona, half of the OSIRIS-REx group.
Such asteroids in all probability clustered collectively to kind our photo voltaic system’s planets, so we will use them to perceive how the planets shaped and grew. Bennu specifically hosts giant concentrations of carbon, the major constructing block of natural molecules – which in flip are the constructing blocks for all times as we all know it.
“We’re pretty sure that there will be organic molecules in these samples,” says OSIRIS-REx scientist Michelle Thompson at Purdue University in Indiana. “Studying these organic molecules might help us understand what organics were around in the early solar system that could have seeded life on Earth.”
Similar samples have already been returned by Japan’s Hayabusa2 spacecraft, which visited an asteroid known as Ryugu. A key element of the researchers’ aim of understanding the historical past of the photo voltaic system will likely be evaluating mud samples from these two objects.
“Let’s say you are a visitor to Earth and you want to learn all about Earth’s geologic history, so you pick up one rock – you’re never going to be able to learn that,” says Thompson. “Going to more than one different asteroid really opens up a whole new world to really understand the diversity of material that was around 4.5 billion years ago”, about the time when the photo voltaic system shaped.
On 24 September, the day will begin early for the OSIRIS-REx group. In the wee hours of the morning, the group’s engineers will make a name about whether or not it is protected to launch the pattern capsule. If they offer the “go”, will probably be despatched hurtling in the direction of Earth from about 102,000 kilometres away, greater than 1 / 4 of the distance to the moon. It will journey for about 4 hours earlier than slamming into the ambiance at round 44,000 kilometres per hour. During its descent, will probably be protected and slowed by a warmth defend and two parachutes till it touches down in the Utah desert.
“Once we release the capsule, there’s nothing else we can do except wait and hope everything goes smoothly,” says Polit. “All these years of work, it all comes down to that 13-minute descent through the atmosphere.” If the capsule can’t be launched on 24 September, will probably be two years earlier than researchers have an opportunity to attempt once more.
If it may be launched, although, the OSIRIS-REx spacecraft will proceed on in the direction of an prolonged mission at the asteroid Apophis. On Earth, the pattern it drops will likely be instantly scooped up and despatched to Houston for scientists to analyse. “I honestly feel like a kid on Christmas Eve,” says Thompson. “I’m about to wake up and get all these gifts of samples from Bennu.”
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